Skocz do pozycji: 1.

Tytuł:

Dolomite and calcite enhancement of whey protein isolate hydrogels

Autorzy:

Norris, K.
Tsang, S. C.
Kerns, J. G.
Kłosek-Wawrzyn, E.
Jaegermann, Z.
Douglas, T. E. L.

Powiązania:

https://bibliotekanauki.pl/articles/285345.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

hydrogels
dolomite
calcite

Źródło:

Engineering of Biomaterials; 2018, 21, 148; 98
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Changes of surface properties of calcite particles with calcium stearate using conventional experimental design and properties of coated calcite

Autorzy:

Ucurum, M.
Bayram, O.
Toraman, O. Y,
Kılıc, H.
Yalcın, S.

Powiązania:

https://bibliotekanauki.pl/articles/109347.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcite
surface modification
mechano-chemical
calcium stearate
properties of modified calcite

Opis:

Calcite is utilized as a filler mineral in the industries such as plastics, rubber, and paint, to gain products with a variety of features. In order to use a calcite ore as a filler, some specific physical and physico-chemical properties are required such as ultra-fine sizes and conversion of hydrophilic to hydrophobic structure. In the present study, for these purposes, surfaces of the ultra-fine calcite powder (d50=2.94 μm) were coated by a mechano-chemical process with calcium stearate [Ca(C17H35COO)2] in a stirred ball mill. The influence of operating parameters such as calcite filling-ratio, ball-filling ratio, operation speed, grinding time and chemical dosage on the active ratio (%) was systematically examined. Then, the properties of modified calcite product were measured and evaluated by contact angle, TGA, DTA, FTIR, and SEM. The results showed that the mechano-chemical technology is very effective for modifying the surface of micronized calcite products using calcium stearate chemical.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 688-700
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Separation of magnesite and calcite based on flotation solution chemistry

Autorzy:

Yao, Jin
Gong, Xiufeng
Sun, Haoran
He, Ruofan
Yin, Wanzhong

Powiązania:

https://bibliotekanauki.pl/articles/2146910.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnesite
calcite
reverse flotation

Opis:

The dissolution characteristics of minerals, dissolution of flotation agents in solutions, and equilibrium of dissociations and associations serve as the basis for determining the optimal conditions for the effective components of flotation agents and for evaluating the interaction between flotation agents and minerals. This basis provided the theoretical support for the flotation separation of minerals. Based on this, the flotation separation of magnesite and calcite was realized using sodium dihydrogen phosphate, also known as monosodium phosphate (MSP), as a regulator and dodecylamine (DDA) as a collector. When MSP was used in the DDA system, single-mineral and binary mixed-ore flotation tests revealed that the floatability of calcite was significantly greater than that of magnesite and the separation of magnesite and calcite was more effective, respectively. Zeta potential measurements showed that MSP-containing negative groups could selectively reduce the zeta potential of calcite and promote the adsorption of DDA-containing positive groups on the surface of the calcite. However, this effect was negligible on the zeta potential of magnesite. Due to the stronger affinity of MSP to Ca2+ than that to Mg2+, as demonstrated by Fourier transform infrared and X-ray photoelectron spectroscopy analyses, the MSP was adsorbed onto the surface of calcite primarily by hydrogen bonds rather than magnesite, which promoted the stronger adsorption of DDA-containing positive groups on the surface of the calcite. As a result, the differences in the floatability of magnesite and calcite were enlarged by MSP. Thus, MSP can be utilized an effective regulator for the efficient separation of magnesite from calcite via reverse flotation.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 149398
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Żyłowe złoża kalcytów
Vein calcite deposits

Autorzy:

Bąk, B.
Kuć, P.
Nieć, M.

Powiązania:

https://bibliotekanauki.pl/articles/170852.pdf

Data publikacji:

2016

Wydawca:

Poltegor-Instytut Instytut Górnictwa Odkrywkowego

Tematy:

kalcyt
żyły kalcytowe
różanka
wapienie
dolomity
calcite
vein of calcite
limestone
dolomite

Opis:

Żyły kalcytów cechujące się znaczną grubością, od kilku do kilkunastu, rzadziej kilkudziesięciu metrów, występują w obszarze kielecko-chęcińskim oraz w rejonie Krzeszowic koło Krakowa. Niektóre z nich są udokumentowane i wykazywane w krajowym bilansie zasobów. Obecnie nie mają znaczenia gospodarczego i nie są eksploatowane. Miały one znaczenie w przeszłości. Wydobywano z nich kalcyt żyłowy, zwany „różanką”, ceniony z uwagi na jego walory dekoracyjne. Wykorzystywane były głównie w budownictwie sakralnym. Żyły kalcytu występujące w strefie zaburzeń tektonicznych, przez co cechuje je złożona budowa o zróżnicowanych teksturach. Poszczególne generacje kalcytu różnią się barwą i strukturą skupień kalcytu. Kalcyt zazwyczaj jest grubokrystaliczny, często jego agregaty mają budowę pręcikową. Żyły mają budowę złożoną, krystyfikacyjną i brekcjową. W drugiej połowie XX w. żyły kalcytowe, z przyczyn ekonomicznych i względów ochrony środowiska, straciły znaczenie gospodarcze. Ich eksploatacja na niewielką, rzemieślniczą skalę, powinna być nadal możliwa jako źródło kamienia do rekonstrukcji starych zabytków architektonicznych.
Pure calcite veins of considerable thickness up to teens of meters, that occurs in the western part of Holy Cross Mts., and to the West of Kraków, were economically important in the past. Their coarse crystalline varied: banded, cockade or breccia structure and varied rose coloration, make theme unique decorative, ornamental stone. Recently, they lost importance due to small size and environment protection exigencies, however they are listed in governmental mineral resources inventory. Their small scale, artisanal quarrying is still possible, as a source of ornamental stone for reconstruction of old architectural monuments.

Źródło:

Górnictwo Odkrywkowe; 2016, 57, 5; 34-41
0043-2075

Pojawia się w:

Górnictwo Odkrywkowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Applicability of statistical process control for surface modification plant and properties of coated calcite

Autorzy:

Ucurum, M.
Malgir, E.
Deligezen, H.
Karaer, N.
Avsar, M.

Powiązania:

https://bibliotekanauki.pl/articles/110501.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcite
surface modification
pin mill plant
statistical process control
coated calcite properties

Opis:

Due to its low surface energy, easy dispersion, high homogeneity and whiteness, coated (modified) calcite has increasingly been used in many industries, particularly in the plastics. The demand for this product will most likely increase in the years to come. Surface modification of calcite with a fatty acid would lead to a great expansion of industrial applications. The color values of coated calcite products are the first quality parameter. Therefore, it is very important to monitor the variations in the color characteristics of the coated calcite products. It is well known that statistical process control (SPC) techniques have been widely used in the many industries. In the present study, the surface of micronized calcite was coated with stearic acid by a pin mill. X-R control graphics and process capability index were applied for monitoring variations in quality control based on color parameters (L*, a* and b*) for the pin mill plant. In addition, active ratio, particle size distribution, whiteness parameters, BET, FTIR, TGA-DTA and SEM were then determined on a coated calcite sample. The results show that the pin mill plant seems under control and the coating technology is very effective in modifying the surface of micronized calcite products.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 803-820
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

The Evaluation Potential as Micronized Calcite of White Marble Waste
Ocena potencjału pozyskania zmikronizowanego kalcytu z odpadów z białego marmuru

Autorzy:

Deniz, Vedat
Polat, Ercan

Powiązania:

https://bibliotekanauki.pl/articles/318935.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

calcite
marble wastes
micronized calcite
physical properties of micronized calcite
chemical properties of micronized calcite
physicochemical properties of micronized calcite
mineralogical properties of micronized calcite
kalcyt
odpady marmuru
kalcyt mikronizowany
właściwości fizyczne mikronizowanego kalcytu
właściwości chemiczne mikronizowanego kalcytu
właściwości fizykochemiczne mikronizowanego kalcytu
właściwości mineralogiczne mikronizowanego kalcytu

Opis:

Natural calcium carbonates have a great importance in the world’s economy due to their numerous applications areas such as calcium carbonate in the paper and paint industries. The final calcite products have rigorous quality specifications which are currently difficult to meet for local producers in Turkey. Therefore, large quantities of high white marble wastes have been transported long distances inside the country to supply the different industrial plants for using calcite. Marble wastes, located in Afyon and Kutahya regions, Turkey’s mid-west, are used generally for concrete and highway purposes. Evaluations of marble wastes are very important for the economic development of any country or region. This study aims at developing new perspective for evaluation of marble wastes as domestic calcite resources and serves as a guide for investment and decision making for the Turkey calcite industry. This paper presents applied research work to determining the product quality for evaluation as micronized calcite of marble wastes and gives an overview of the market situation for the regional producers. The aim of the work is to characterize four different marble wastes and to determine the potential for production of the required quality for the Turkey calcite market;- to control the quality of the products by application tests, including the measurement some tests.
Naturalne węglany wapnia mają ogromne znaczenie w światowej gospodarce ze względu na ich liczne zastosowania, takie jak węglan wapnia w przemyśle papierniczym i malarskim. Produkty handlowe kalcytu muszą spełniać rygorystyczne wymagania jakościowe, które obecnie są trudne do osiągnięcia przez lokalnych producentów w Turcji. Dlatego duże ilości odpadów z przeróbki białego marmuru zostały przetransportowane do zakładów przemysłowych które wykorzystują kalcyt. Odpady marmurowe, znajdujące się w regionach Afyon i Kutahya, w środkowo-zachodniej Turcji, są ogólnie wykorzystywane do betonu i budowy autostrad. Możliwość wykorzystania odpadów marmurowych jest bardzo ważna dla rozwoju gospodarczego każdego kraju lub regionu. W artykule przedstawiono nową metodę oceny odpadów marmurowych jako krajowych zasobów kalcytu. Metoda służy jako przewodnik dla inwestorów i do podejmowania decyzji w branży kalcytu w Turcji. W artykule przedstawiono prace badawcze prowadzone w celu określenia jakości produktu - zmikronizowanego kalcytu z odpadów marmurowych oraz przegląd sytuacji rynkowej producentów regionalnych. Celem artykułu jest scharakteryzowanie czterech różnych odpadów marmurowych i określenie potencjału produkcji kalcytu o wymaganej jakości w Turcji. Zaproponowano kontrolę jakości produktów poprzez testy aplikacyjne, w tym pomiary niektórych parametrów.

Źródło:

Inżynieria Mineralna; 2020, 2, 1; 21-28
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Effect of depressants in the selective flotation of smithsonite and calcite using potassium lauryl phosphate as collector

Autorzy:

Sun, Qing
Feng, Qiming
Shi, Qing

Powiązania:

https://bibliotekanauki.pl/articles/110635.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

smithsonite
calcite
flotation
depressant
separation

Opis:

In order to selectively separate smithsonite and calcite using potassium lauryl phosphate as collector and reveal the depression mechanism, the approaches of micro-flotation and zeta potential measurements were adopted. The effects of sodium hexametaphosphate (SHMP), water glass (WG), carboxymethyl cellulose (CMC) and lignosulfonate calcium (LSC) as depressants on smithsonite and calcite have been studied through micro-flotation. The single mineral flotation tests show that LSC can depress calcite, but it has little effect on smithsonite flotation. Flotation separation of a mixture of smithsonite and calcite can be completed to obtain a zinc concentrate grade up to 33.85% Zn with a recovery of 70.06%. The zeta potential results illustrate that LSC has higher tendency to be adsorbed on the surface of calcite. However, there is little adsorption of LSC on smithsonite.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 89-96
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Effect of depressants in the selective flotation of smithsonite and calcite using cationic collector

Autorzy:

Liu, Hongjiang
Zhang, Guofan
Luo, Yuanjia

Powiązania:

https://bibliotekanauki.pl/articles/1449481.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

smithsonite
calcite
selective separation
depressant

Opis:

This work studied the effects of sodium hexametaphosphate (SHMP), tanning extract, water glass (WG) and calcium lignosulfonate (CLS) as depressants for the separation of smithsonite from calcite by using a cationic collector called octadecylamine acetate (ODA). Micro-flotation experimental tests showed that CLS can greatly and selectively depress calcite. When the dosages of CLS used were 20 and 40 mg/L, a concentrate with Zn grades of 42.54% and 49.32% and Zn recoveries of 81.66% and 68.00% was achieved in the flotation separation of mixed mineral (1:1 smithsonite:calcite). Zeta potential and adsorption measurements revealed that the adsorption of CLS on calcite’s surface was greater than that on smithsonite’s surface. When CLS was added, the adsorption of ODA was hindered greatly on the calcite’s surface but slightly on the smithsonite’s surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 1; 1-10
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Calcium carbonate mineralization. Part II: effect of poly(ethylene glycol) and block copolymers molecular weight on formation of precipitate

Autorzy:

Polowczyk, I.
Bastrzyk, A.
Kozlecki, T.
Grzadka, E.
Sadowski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/110696.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

mineralization
block copolymers
PEG
calcite

Opis:

In this study the role of PEG and PEO-PPO-PEO block copolymers molecular weight in precipitation of calcium carbonate was examined. The CaCO3 particles were characterized by FTIR spectroscopy, X-ray, SEM and particle size distribution analysis. In absence and presence of modifiers, mixing of the reagents led to the formation of calcite crystals. The calcium carbonate obtained with poly(ethylene glycol) and block copolymers was characterized by smaller diameter in comparison with the one without modifiers. It was observed that using compounds with different molecular weights has no obvious effect on the form and properties of precipitated calcium carbonate particles.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 2; 587-600
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:

Diagenetic alteration in low-Mg calcite from macrofossils : a review

Autorzy:

Ullmann, C. V.
Korte, C.

Powiązania:

https://bibliotekanauki.pl/articles/2059799.pdf

Data publikacji:

2015

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

diagenetic alteration
macrofossil calcite
isotopes
palaeoenvironment

Opis:

The quality of palaeoenvironmental reconstructions based on macrofossil carbonate critically depends on preservation of the shell material because post-depositional processes can modify its structural, chemical and isotopic composition, potentially overprinting or completely erasing palaeoenvironmental information. A suite of methods can be employed to evaluate the impact of diagenetic processes on the primary geochemical signatures of samples. Here we review the benefits and shortcomings of the most commonly employed optical (optical microscopy, cathodoluminescence microscopy, scanning electron microscopy) and chemical (trace element abundances, isotopic ratios) screening techniques used to assess the alteration degree of low-Mg calcite macrofossils and summarize the findings on diagenetic trends observed for elemental and isotopic systems in such materials. For a robust evaluation of the preservation state of biogenic calcite, it is advisable to combine a set of complementary techniques. Absolute limiting values of element and isotope ratios for discarding diagenetically altered materials cannot be universally applied, but should rather be evaluated on a case to case basis. The evaluation can be improved by analyses of diagenetic carbonate and altered fossil materials, which help constraining the diagenetic trajectories in the sampled specimens. Quantification of post-depositional alteration is possible, but in most cases the complexity of diagenetic systems hampers the possibility of retrieving original proxy values for palaeoenvironmental reconstructions from partially altered materials.

Źródło:

Geological Quarterly; 2015, 59, 1; 3--20
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Calcium carbonate mineralization. Part 1, The effect of poly(ethylene glycol) concentration on the formation of precipitate

Autorzy:

Polowczyk, I.
Bastrzyk, A.
Kozlecki, T.
Sadowski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/110925.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcium carbonate
calcite
vaterite
mineralization
PEG

Opis:

In this study, the role of polymer in precipitation has been examined by studying the effect of poly(ethylene glycol) (PEG) on the formation of calcium carbonate particles. The CaCO3 particles were characterized by several techniques, such as FTIR, XRD, SEM, and particle size distribution analysis. In the absence of polymer, the mixing of reagents in an aqueous solution led to the formation of calcite crystals. Introduction of poly(ethylene glycol) molecules reduced the rate of crystallization process, and the effect was concentration dependent. In the presence of 0.05, 0.1, and 0.5 % of PEG, after 5 minutes of precipitation initiation, vaterite microspheres appeared in the system and which were transformed into calcite crystals after 24 hours. The calcium carbonate obtained with PEG was characterized by smaller sized particles in comparison with the ones without polymer.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 631-639
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

High Porous Ceramic for Oil/Water Separation: Calcite as a Sintering Aid

Autorzy:

Abdulhameed, Mohammed Abdulmunem
Rahman, Mokdad Hayawi
Azziz, Haider Nadhom

Powiązania:

https://bibliotekanauki.pl/articles/27323841.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

porous ceramic membrane
sintering aid
calcite

Opis:

The effects of calcite (CaCO3) as sintering aid on the preparation of local aluminum silicate microfiltration membranes were characterized in terms of morphology, thermal shrinkage behavior, porosity, permeation performance, and pure water permeate flux for the membrane. Material selection is based on availability and formability. In order to create a suspension, an organic solvent (N-methyl-2-pyrrolidone) and a polymer binder were added to a mixture of aluminum silicate and calcium carbonate. The coagulant bath consisted of water, and the suspension was extruded into a hollow fiber using a spinneret. The membrane precursor is subjected to high temperatures up to 1250 °C and this process called the sintering process gets strong hollow fiber with high mechanical stability. The addition of the CaCO3 to the dispersion altered the structure of the resulting sintered membranes. The obtained finding demonstrates that carbon calcium addition to aluminum silicate has an affirmative on overall porosity in contrast to those made from purely natural aluminum silicate, as a result the aluminum silicate calcite ceramic microfiltration membrane, which had a high porosity of above 50%, shows the highest permeability of 35.8 ml m-2•s-1 and above 97% oil rejection when operating at 0.15 MPa trans-membrane pressure in oil-in-water separation experiments. The results show that low-cost aluminum silicate-calcite component of ceramic membranes and the manufactured ceramic microfiltration membrane can handle emulsified oily wastewater.

Źródło:

Journal of Ecological Engineering; 2023, 24, 7; 88--95
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

The effect of the main component ratios in the joint filling on the product quality

Autorzy:

Rizaoğlu, Tamer
Karataş, Muhammed Ziya
Çoşkun, Canberk

Powiązania:

https://bibliotekanauki.pl/articles/27324350.pdf

Data publikacji:

2022

Wydawca:

Instytut Techniki Górniczej KOMAG

Tematy:

cement
joint filling
calcite
building materials

Opis:

When building materials are exposed to environmental and natural factors such as temperature differences, humidity, strong wind and earthquake in the areas where they are applied, irreversible damages such as separation, cracking and level difference occur in structures and building materials. In order to prevent these damages, the joints are left between the building materials and the gaps are filled with filling materials. The composition of the materials filling the joint gaps is also very important. The most important problems encountered in joint fillings are rupture, cracking and therefore permeability. In this study, it is aimed to compare the joint filling materials produced from different proportions of aggregate and white cement against rupture and cracking, and to determine the mixture ratio that exhibits the best performance. Five different recipes were prepared by using calcite powder as aggregate, white Portland cement as binder and water-repellent, volumizing and thickening chemical additives as auxiliary materials. On the prepared test samples; Capillary water absorption, water absorption by weight and volume, unit volume weight, saturated unit volume weight, porosity, compressive strength, bending strength, surface hardness and abrasion resistance tests were carried out. Considering the cost and environmental damage of cement, which is one of the main components in joint filler material, DD2 [Calcite (71.50%)] + White Cement (26.50%) + [Polymer + Cellulose + Plasticizer + Silicone] 2% has been detected as the most appropriate recipe.

Źródło:

Mining Machines; 2022, 40, 4; 180--190
2719-3306

Pojawia się w:

Mining Machines

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Effective flotation separation of scheelite and calcite by applying methylene phosphonic acid sodium as a novel and green depressant

Autorzy:

Zhou, Hepeng
Wu, Handan
Guo, Jiangfeng
Tang, Xuekun
Huang, Wen
Luo, Xianping

Powiązania:

https://bibliotekanauki.pl/articles/24086193.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

scheelite
calcite
inhibition mechanism
flotation separation

Opis:

It is known that the flotation separation of scheelite and calcite is quite difficult due to their similar surface properites. To slove the problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as an efficient depressant for flotation separation of calcite for the first time. In flotation experiments, it demonstrates that EDTMPS could strongly inhibit the flotation of calcite but barely affect the flotaiton behavior of scheelite, showing excellent dpress ability and selectivity. Based on a series of measurements including contact angle analysis, zeta potential, and XPS analysis, it was found that large amout of EDTMPS could be absorbed on the surface of calcite through strong chemical chelation reaction and thus inhibiting the further adsorption of NaOL. On the contrary, little EDTMPS was absorbed on that of scheelite owing to the negatively charged tungstate ions on the surface in relative terms. All in all, these results exhibit EDTMPS has excellent selective inhibition ability on calcite, which can be potentially applied in actual scheelite and calcite flotation separation process.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168517
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

The effect of polyacrylic acid on the surface properties of calcite and fluorite aiming at their selective flotation

Autorzy:

Zhang, C.
Gao, Z.
Hu, Y.
Sun, W.
Tang, H.
Yin, Z.
He, J.
Guan, Q.
Zhu, Y.

Powiązania:

https://bibliotekanauki.pl/articles/110577.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcite
fluorite
selective flotation
polyacrylic acid

Opis:

In this study, the polyacrylic acid (PAA) was studied as a selective depressant for calcite in the selective flotation of fluorite and calcite, and the implications of this process for the separation of fluorite ore were studied using micro-flotation tests, and the results were analyzed with Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) analyses. The flotation tests indicated that the preferential adsorption of PAA onto calcite rather than sodium oleate (NaOl) could selectively depress the flotation of calcite, allowing its separation from fluorite at pH 7. The zeta potential of calcite became more negative with the addition of PAA rather than with NaOl. However, the characteristic features of PAA adsorption were not observed for fluorite, suggesting that NaOl preferentially adsorbed on the surface of fluorite, or that PAA could be replaced by NaOl on the fluorite surface. FT-IR and XPS analysis were utilized to obtain a better understanding of the mechanism by which PAA was more strongly adsorbed on the calcite surface than NaOl. This was revealed to occur through chemical bonding between the carboxyl group of PAA and the hydroxyl groups of the Ca species on the calcite surface, modifying the structure of the adsorbed layer. A possible adsorption mechanism, along with a postulated adsorption mode for the surface interaction between PAA and calcite, is proposed.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 868-877
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Experimental investigations of preparation of calcite particles by ultrasonic treatment

Autorzy:

Toraman, O. Y.

Powiązania:

https://bibliotekanauki.pl/articles/110407.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcite
fine particles
ultrasonic treatment
product size

Opis:

This paper investigates breakage of calcite powder (d50 = 25.23 μm) to fine particle sizes using an ultrasonic generator (400 W, 24 kHz). The present study focuses on comminution of calcite powder in water media by ultrasonic treatment and the effect of some operational parameters such as treatment time (5–30 min), ultrasonic power (30-100% as amplitude), solid ratio (5-30% w/w), probe positions (0.5-2 cm) and cycle on the product size. Experimental results were evaluated on the basis of average particle size (d50). Sonication of calcite produced a drastic particle-size reduction (d50=12.89 μm) under optimal conditions.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 859-868
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Flotation separation of scheelite from calcite using sodium polyacrylate as depressant

Autorzy:

Zhang, Y.
Chen, R.
Li, Y.
Wang, Y.
Luo, X.

Powiązania:

https://bibliotekanauki.pl/articles/110896.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

scheelite
calcite
flotation
sodium polyacrylate
selective depression

Opis:

The depressing properties of sodium polyacrylate (PA-Na) for calcite from scheelite were studied by microflotation experiments, zeta potentials, X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculation. Flotation results revealed that the selective depression effect of PA-Na was better than that of sodium silicate (Na2SiO3), and PA-Na can depress calcite more effectively than scheelite. The flotation recovery of scheelite and calcite kept at about 75% and 15% respectively at the pulp pH 9.3~9.6 and PA-Na concentration from 37.5 mg/dm3 to 50 mg/dm3. The zeta potentials of the minerals were significantly altered and the zeta potential of calcite became more negative than scheelite. XPS analysis deduced the occurrence of chemisorption between PA-Na and mineral surfaces, and the chemisorption of PA-Na on calcite was stronger than on scheelite. The results from DFT calculation demonstrated that the absolute value of the adsorption energy in the presence of PA-Na on the surface of calcite {104} was larger than on the surface of scheelite {111}. With the combination of the analysis, it could be concluded that calcite was more easily depressed than scheelite, and this finding remarkably matched with the microflotation experimental results. Furthermore, by using PA-Na as depressant, the flotation separation of scheelite from calcite can be achieved by controlling the flotation pH and PA-Na dosage.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 505-516
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Studies on the carbonation of Czatkowice limestone in Calcium Looping process

Autorzy:

Tomaszewicz, G.
Kotyczka-Morańska, M.
Plis, A.

Powiązania:

https://bibliotekanauki.pl/articles/778245.pdf

Data publikacji:

2016

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

calcite
limestone
calcium looping
CO2
sorbent

Opis:

The growing demand for the reduction of anthropogenic CO2 emissions has stimulated the development of CO2 capture methods. One of the best capture methods comprises the calcium looping process, which incorporates calcium-based sorbents during the calcination and carbonation cycles. Czatkowice limestone may be considered to be a prospective chemical sorbent for the calcium looping process because of its formation characteristics. This paper addresses the thermogravimetric studies conducted under varying conditions of temperature and various concentrations of CO2 during the carbonation cycles. Moreover, a kinetic analysis of the carbonation stage was performed for the calcined sample at varying temperatures. The kinetic parameters for calcination and diffusion were determined. In addition, there was an increase in the concentration of CO2 with an increased carbonation conversion. The research results demonstrate that in further cycles of carbonation/calcination, the calcium sorbent reaches a higher rate of carbonation conversion with increased levels of CO2

Źródło:

Polish Journal of Chemical Technology; 2016, 18, 2; 53-58
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Enrichment of wollastonite with high calcite content

Autorzy:

Şavran, Ceyda
Türk, Tülay
Kangal, Murat Olgaç
Irgasheva, Ganjinakhon

Powiązania:

https://bibliotekanauki.pl/articles/2146878.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

wollastonite
calcite
flotation
magnetic separation
lankropol OPA

Opis:

Wollastonite plays a significant role as an industrial raw material in many fields; its exclusive properties mean that it is used in ceramics, paint, metallurgy and coatings. In nature, wollastonite mostly occurs with calcite. While the most common method for separating wollastonite from calcite is calcination, flotation is one of the methods for separating two minerals in a more economic, environmentally friendly way. In this study, the ore contains a large amount of calcite and augite, which is an iron bearing mineral that is subjected to magnetic separation, followed by flotation in order to obtain wollastonite and calcite concentrations individually. The SiO2, CaO and Fe2O3 contents in the ore are 28.00%, 48.20% and 0.45%, respectively. After magnetic separation has reduced the iron content, flotation experiments are carried out to find the optimum conditions. For the flotation process, the effect of particle size, pH and collector dosage are investigated. A wollastonite concentration of 84% purity is successfully achieved, with a 0.17% iron concentration under the optimal conditions of 100 micron particle size, pH 8 and 500 g/t collector dosage. The purity of the calcite is raised to 95% with the application of a cleaning stage.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 153058
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Quinic acid as a novel depressant for efficient flotation separation of scheelite from calcite

Autorzy:

Huang, Zheyu
Kuang, Jingzhong
Yu, Mingming
Ding, Dan

Powiązania:

https://bibliotekanauki.pl/articles/24085979.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quinic acid
scheelite
calcite
depression
selective adsorption

Opis:

There are difficulties to the conventional depressant for achieving separation of scheelite from calcite for the sake of their similar surface properties. The paper reported that a new depressant quinic acid (QA) was used for separating scheelite from calcite. The adsorption experiments, zeta potential experiment, contact angle, FTIR, XPS analysis and crystal chemistry analysis were utilized to known the depression mechanism of selectivity. The results showed that the recovery of calcite decreased drastically after QA added, whereas hardly influenced on scheelite. The tungsten concentrate could reach 66.24% WO3 grade and 89.46% recovery with 1.5×10-4 mol•L-1 QA at pH=9. The surface adsorption quantity of the QA on calcite was much greater than scheelite, which enhanced significantly the hydrophilicity of calcite surface. Due to its negative charge, QA could be adsorbed on the surface of calcite which had positive charge instead of that of scheelite with negative charge. Subsequently, free carboxyl groups of QA could chelated with Ca2+ species on the calcite surface to form stable chemical adsorption in order to prevent the Pb-BHA to form further adsorption on that, so there was no increase significantly on hydrophobicity. However, QA was obviously weak for adsorbing while Pb-BHA which could still be chemically adsorbed on scheelite surface of pre-treated with QA.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 166008
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Influence and mechanism of Zn2+ on fluorite/calcite in sodium hexametaphosphate flotation system

Autorzy:

Ruitao, Liu
Dan, Liu
Ruofan, Sun
Daqian, Wang
Wenkang, Zhang
Yuebing, Liu
Shuming, Wen

Powiązania:

https://bibliotekanauki.pl/articles/2175451.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fluorite
calcite
sodium hexametaphosphate
flotation
metal ions

Opis:

Fluorite and calcite have similar surface properties and natural floatability, so their flotation separation has always been a problem faced by the beneficiation industry. The key to flotation separation is the choice of depressants. Sodium hexametaphosphate (SHMP) has a good effect on fluorite calcite selective inhibition. In this paper, the effects of Zn2+ on the selective inhibition of SHMP in the flotation process of fluorite and calcite were studied through single mineral and artificial mixed mineral flotation experiments. Solution chemical calculation, X-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared spectroscopy (FT-IR) and Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) analyses investigated the mechanism of action of Zn2+, which had the most significant negative effect on the selective inhibition of SHMP. The results show that the main components of SHMP inhibiting minerals are HPO42- and H2PO4-, which can react with Ca active sites on the mineral surface to form hydrophilic Ca(H22PO4)2 and CaHPO4, while Zn2+ The presence of HPO42- in solution resulted in the formation of stable ZnHPO4 complexes, thereby weakening the inhibitory effect of SHMP on minerals.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 151676
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Multifrequency EPR study on radiation induced centers in calcium carbonates labeled with 13C

Autorzy:

Sadło, J.
Bugaj, A.
Strzelczak, G.
Sterniczuk, M.
Jaegermann, Z.

Powiązania:

https://bibliotekanauki.pl/articles/146101.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

aragonite
calcite
dosimetry
EPR spectroscopy
γ-irradiation
radicals

Opis:

In calcite and aragonite, γ-irradiated at 77 K, several paramagnetic centers were generated and detected by EPR spectroscopy; in calcite, CO3 – (orthorhombic symmetry, bulk and bonded to surface), CO3 3–, NO3 2–, O3 –, and in aragonite CO2 – (isotropic and orthorhombic symmetry) depending on the type of calcium carbonate used. For calcium carbonates enriched with 13C more detailed information about the formed radicals was possible to be obtained. In both natural (white coral) and synthetic aragonite the same radicals were identifi ed with main differences in the properties of CO2 – radicals. An application of Q-band EPR allowed to avoid the signals overlap giving the characteristics of radical anisotropy.

Źródło:

Nukleonika; 2015, 60, No. 3, part 1; 429-434
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Wstępne badania kalcytowej ceramiki porowatej metodą mikrotomografii komputerowej
Microcomputed tomography for evaluation of 3D calcite porous ceramics - preliminary report

Autorzy:

Jaegermann, Z.
Turżańska, K.
Michałowski, S.
Jabłoński, M.

Powiązania:

https://bibliotekanauki.pl/articles/284083.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

ceramika kalcytowa
struktury porowate
calcite ceramics
porous structures

Źródło:

Engineering of Biomaterials; 2007, 10, no. 65-66; 45-47
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Selective flotation of witherite from calcite using potassium chromate as a depressant

Autorzy:

Qiu, Yangshuai
Zhang, Lingyan
Jiao, Xuan
Guan, Junfang
Li, Ye
Qian, Yupeng

Powiązania:

https://bibliotekanauki.pl/articles/110784.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

witherite
calcite
selective flotation
sodium oleate
potassium chromate

Opis:

Witherite has been widely used as an industrial and environmental source of barium, with calcite being the primary associated carbonate mineral. However, few studies have been conducted to effectively concentrate witherite from barium ores. In this work, with the treatment of potassium chromate (K2CrO4) and sodium oleate (NaOL), witherite was selectively separated from calcite through selective flotation at different pH conditions. In addition, contact angle, Zeta potential, adsorption and X-ray photoelectron spectroscopy measurements were performed to characterize the separation mechanisms. The results demonstrated that NaOL had a strong collecting ability for both witherite and calcite; nevertheless, witherite could be effectively selected from calcite with the highest recovery at pH 9 in the presence of K2CrO4. From the XPS measurements, NaOL and K2CrO4 were found to be primarily attached to the surfaces of witherite and calcite through chemisorption. The presence of K2CrO4 on the surface of calcite adversely influenced the NaOL adsorption, which could make the flotation separation efficient and successful.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 2; 565-574
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Homogenization phenomena of surface components of fluorite and calcite

Autorzy:

Sun, Ruofan
Liu, Dan
Zhang, Benyue
Lai, Hao
Wen, Shuming

Powiązania:

https://bibliotekanauki.pl/articles/1448969.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

homogenization phenomena
surface composition
fluorite
calcite
mixed grinding

Opis:

The flotation separation of fluorite and calcite poses one of the most difficult problems in the mineral processing industry. In particular, the surface homogenization of fluorite and calcite worsens the result of fluorite flotation. In this paper, time of flight secondary ion mass spectrometry and principal component analysis are used to study the surface homogenization of fluorite and calcite during grinding and in solution using X-ray photoelectron spectroscopy, infrared spectroscopy, and solution chemical calculations. The results show that the surface composition of calcite converts to fluorite after mixed grinding and that the surface composition of fluorite also converts to calcite in clarified calcite solution.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 1; 250-258
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Effect of calcite and mica contents in nepheline syenite samples on the ceramic body sintering behaviours and surface roughness

Autorzy:

Durgut, Emrah
Cinar, Mustafa
Ozdemir, Orhan

Powiązania:

https://bibliotekanauki.pl/articles/2146930.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

nepheline syenite
calcite
mica
ceramic
sintering
surface roughness

Opis:

In this study, the effects of calcite and mica contents in nepheline syenite (NS) samples beneficiated by high intensity dry magnetic separation and flotation methods on ceramic bodies were investigated in detail. The NS samples were, first, sintered to observe the physical and surface roughness properties, and characterized based on the change of NS samples such as color, shrinkage, water absorption, and surface roughness after the sintering process. L-a-b color and Ra, Rz, Rt values for the NS samples were determined. The decrease in calcite and mica contents affected the surface of sintered specimens positively by reducing roughness values. Additionally, the water absorption values were found to be directly proportional to Ra values for unglazed surfaces. In conclusion, calcite and mica minerals in NS samples negatively affected surface quality by forming pinholes due to dehydroxylation and outgassing reactions in the sintering process.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no 149179
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Application of diethylenetriaminepenta pentasodium salt as an eco-friendly depressant to effectively improve the flotation separation of scheelite and calcite

Autorzy:

Zhou, Hepeng
Wu, Handan
Guo, Jiangfeng
Tang, Xuekun
Huang, Wen
Luo, Xianping

Powiązania:

https://bibliotekanauki.pl/articles/27323649.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

flotation
scheelite
calcite
diethylenetriaminepenta pentasodium salt
depressant
adsorption

Opis:

Diethylenetriaminepenta (methylene-phosphonic acid) pentasodium salt (DTPMPA), an eco-friendly reagent, was tried for the first time as a depressant for flotation separation of scheelite from calcite. Micro-flotation tests show that DTPMPA can selectively depress the floatability of calcite. In contrast, DTPMPA barely affects the flotation behavior of scheelite. Based on the selective depress effect, floatation separation of scheelite and calcite can be effectively achieved by using DTPMPA as depressant in artificially mixed minerals flotation tests. Based on a series of measurements, it found the surface of calcite was positively charged due to the existence of Ca ion site, which can be chelated with –PO3H- functional group on the surface of DTPMPA. In the flotation process, DTPMPA can be chemically absorbed on the surface of calcite to inhibit further collector adsorption. On contrast, little DTPMPA was adsorbed on the surface of scheelite due to the spatial site resistance and electrostatic repulsion induced by surface WO42+. All in all, these results exhibit DTPMPA has excellent selective depression ability on calcite, which can be potentially applied in the actual scheelite flotation process.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174718
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Ordovician seawater composition : evidence from fluid inclusions in halite

Autorzy:

Meng, F.
Zhang, Y.
Galamay, A. R.
Bukowski, K.
Ni, P.
Xing, E.
Ji, L.

Powiązania:

https://bibliotekanauki.pl/articles/2059770.pdf

Data publikacji:

2018

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Ordovician
fluid inclusions
halite
seawater composition
calcite sea

Opis:

Fluid inclusions in halite can directly record the major composition of evaporated seawater; however, Ordovician halite is very rare. The Ordovician is a key time during the evolution history because profound changes occurred in the planet’s ecosystems. Marine life was characterized by a major diversification, the Great Ordovician Biodiversification Event and the Late Ordovician Mass Extinction, the first of the “big five” mass extinctions. However, so far there is no data on the Ordovician seawater. Data from the Ordovician-Silurian boundary were available only. In this study, we report the major compositions from Middle Ordovician halite in China to give the exact composition of Ordovician seawater. The basic ion composition (K+, Mg2+, Ca2+, and SO42-) of inclusion brines was established with the use of ultramicrochemical analysis. The data on the chemical composition of the brines in the primary inclusions indicated that the brines were of Na-K-Mg-Ca-Cl (Ca-rich) type, and cover a huge gap in the evolution of seawater chemistry. The chemical composition of the primary inclusion brine in halite confirmed the earlier results for the Cambrian and Silurian halite originating from other salt basins and the previous speculation of “calcite sea” during the Ordovician, indicating a higher potassium content in the Lower Paleozoic seawater than in the seawater of other periods of the Phanerozoic.

Źródło:

Geological Quarterly; 2018, 62, 2; 344--352
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Acidified water glass in the selective flotation of scheelite from calcite, Part I: performance and impact of the acid type

Autorzy:

Kupka, Nathalie
Möckel, Robert
Rudolph, Martin

Powiązania:

https://bibliotekanauki.pl/articles/109345.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

acidified water glass
scheelite calcite separation
froth flotation

Opis:

To improve the performance of sodium silicate in scheelite flotation and allow the selective separation of scheelite from other semi-soluble salt-type minerals such as calcite, three acids, sulfuric, oxalic and for the first time hydrochloric are used to acidify sodium silicate (also called water glass). A literature review of previous usage of acidified water glass shows that no comparison between acids was made before, that comparisons with alkaline water glass were limited and that the idea that acidified water glass is more efficient at lower dosages has not been proven in scheelite flotation. As a consequence, the impact of the acid type, the ratio between acid and sodium silicate and acid dosage is tested in single mineral flotation and batch flotation experiments. All three acids allow a higher performance of acidified water glass compared to alkaline water glass at lower dosages and with little addition of acid: the tungsten recovery and grade are improved while silicates and to a lesser extent calcium-bearing minerals float less. The dosage of acid is less determining than the mass ratio of the acid to sodium silicate, except in the case of hydrochloric acid. Overall, the acid type does not matter as all three acids perform well in flotation, whereby oxalic and hydrochloric acid are better.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 2; 238-251
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

The flotation separation of barite-calcite using sodium silicate as depressant in the presence of sodium dodecyl sulfate

Autorzy:

Chen, Xiong
Gu, Guohua
Liu, Donghui
Zhu, Renfeng

Powiązania:

https://bibliotekanauki.pl/articles/110272.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

flotation
calcite
barite
sodium dodecyl sulfate
sodium silicate

Opis:

The flotation separation of barite from calcite using sodium dodecyl sulfate (SDS) as the collector and sodium silicate (SS) as the depressant has been concretely studied in this paper. The results show that SDS has high collecting ability for both barite and calcite and that the flotation separation of barite from calcite cannot be achieved by using SDS alone. The depressant sodium silicate has a selective depression effect on calcite by the control of the pulp pH at 9.0 in the presence of SDS. Through locked cycle tests, a concentrate containing 95.54% BaSO4 can be obtained from an actual ore containing 24.5% BaSO4, with a recovery of 86.11%. The zeta potential measurements, adsorption analysis and infrared spectrum studies reveal that the pre-adsorption of sodium silicate strongly favors the adsorption of SDS on the calcite surface and adversely affects SDS adsorption on the barite surface. This property is the reason for the selective depression of SS on calcite.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 2; 346-355
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Origin of calcite-cemented Holocene slope breccias from the Długa Valley (the Western Tatra Mountains

Autorzy:

Gradziński, M.
Jach, R.
Stworzewicz, E.

Powiązania:

https://bibliotekanauki.pl/articles/191437.pdf

Data publikacji:

2001

Wydawca:

Polskie Towarzystwo Geologiczne

Tematy:

slope breccias
calcite cements
radiocarbon dating
Holocene
Tatra Mts.

Opis:

New locality of slope breccias was found in the Western Tatra Mts. It occures in the Długa Valley on a steep slope of ravine beneath the belt of Jurassic radiolarite cliffs. The brecccia consists of angular clasts of radiolarite bound with calcite cements. Void spaces between the clasts contain shells of Holocene snails. The cements are built of columnar crystals composed of acicular subcrystals and of skeletal crystals. The crystals grew rapidly from supersaturated solution due to CO2 degassing. Cementation occurred in vadose conditions in the Atlantcic Phase soon after the scree formation.

Źródło:

Annales Societatis Geologorum Poloniae; 2001, 71, No 2; 105-113
0208-9068

Pojawia się w:

Annales Societatis Geologorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Identification of sandstone-related rocks composition using the X-ray analysis

Autorzy:

Kosuth, M.

Powiązania:

https://bibliotekanauki.pl/articles/344037.pdf

Data publikacji:

2013

Wydawca:

nakł. Maciej Pawlikowski

Tematy:

X-ray analysis
mineral composition
sandstones
siltstones
calcite
dolomite

Opis:

The article presents knowledge based on investigation of sandstones or siltstones composition from the Paleogene flysch terrains in North-East Slovakia. Samples of frequently crumbling clastic rocks were commonly considered to be close to sandstones, composed by predominant quartz. The set of such samples, belonging to Dukla Unit Sandstones were analyzed using the XRD analyses. Beside of quartz the diffraction patterns gave the evidence in significant carbonate share with some minor to minute feldspars, mica and chlorite contents. Among majority of analyzed samples we distinguish three groups of sandstones: (1) with the abundant calcite admixture, (2) the sandstones which contain meaning dolomite portion. The group (3) is representing the samples is formed the same by quartz as by both of carbonates, each of them could form important up to prevailed mineral component. Comparison of analyzed samples mineral composition shows remarkable trend of higher calcite and dolomite contents in younger clastic sediments.

Źródło:

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2013, 16; 1-7
1689-6742

Pojawia się w:

Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Celestite upgrading by jigs in presence of steel balls as ragging material

Autorzy:

Sobhy, Ahmed
El-Midany, Ayman A.
Ibrahim, Susan S.

Powiązania:

https://bibliotekanauki.pl/articles/1447020.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

celestite
calcite
jigging
ragging material
gravity separation
statistical analysis

Opis:

Gravity separation using jigs is widely used for coarse particle sizes separation. However, fine sizes reduce jig performance. In this study, the upgrading of celestite ore by jig was investigated at different size fractions in the presence of ragging material. Three size fractions, i.e., -15+2 mm, - 2.0 + 0.50 mm and - 0.50 + 0.08 mm were used. The steel balls were used, as ragging material, to improve the separation of fines as well as to improve the concentrate quality. The statistical design was used to correlate celestite grade and recovery with studied operating variables, i.e., the ragging number of layers, ragging balls diameter, and separation time, at a fixed water flow rate and stroke length. The design results indicated that the ragging balls diameter and their number of layers play an important role. The smaller the ragging balls diameter and the higher the ragging number of layers are the better the concentrate grade but the longer the separation time. A celestite concentrate of (> 95% SrSO4) with 74.5% recovery was obtained for - 2.0 + 0.50 mm size fraction at the optimum conditions; i.e., 3.1 mm ragging balls diameter, one ragging layers, and 15 minutes separation time.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 5; 118-128
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Mineral carbonation of metallurgical slags

Autorzy:

Kasina, Monika
Kowalski, Piotr
Michalik, Marek

Powiązania:

https://bibliotekanauki.pl/articles/127572.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

blast furnace slag
steel making slag
mineral carbonation
calcite

Opis:

Due to increasing emissions of greenhouse gases into the atmosphere number of methods are being proposed to mitigate the risk of climate change. One of them is mineral carbonation. Blast furnace and steel making slags are co-products of metallurgical processes composed of minerals which represent appropriate source of cations required for mineral carbonation. Experimental studies were performed to determine the potential use of slags in this process. Obtained results indicate that steel making slag can be a useful material in CO2 capture procedures. Slag components dissolved in water are bonded as stable carbonates in the reaction with CO2 from ambient air. In case of blast furnace slag, the reaction is very slow and minerals are resistant to chemical changes. More time is needed for minerals dissolution and release of cations essential for carbonate crystallisation and thus makes blast furnace slags less favourable in comparison with steel making slag.

Źródło:

Mineralogia; 2014, 45, 1/2; 27-45
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Acidified water glass in the selective flotation of scheelite from calcite, part II: species in solution and related mechanism of the depressant

Autorzy:

Kupka, Nathalie
Kaden, Peter
Jantschke, Anne
Schach, Edgar
Rudolph, Martin

Powiązania:

https://bibliotekanauki.pl/articles/1845224.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

acidified water glass
scheelite calcite separation
froth flotation
mechanism

Opis:

Sodium silicate is one of the main depressants against calcite and fluorite in the scheelite flotation industry. In the first part of this article, the authors acidified sodium silicate (AWG) with three acids (sulfuric, oxalic and hydrochloric) to improve its performance. Results showed that acidified water glass outperforms alkaline water glass in terms of selectivity: it increases mainly the grade by further depressing silicates and calcium-bearing minerals. In most cases, AWG requires lower dosages to do so. The effect of acidified water glass is evaluated through Mineral Liberation Analysis (MLA), froth analysis, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy in order to hypothesize its mechanism. MLA shows that AWG affects silicates and sulfides more intensely than semi-soluble salttype minerals. Froth observations indicate other species in solution associated to the acid having an impact on the flotation results. Raman spectroscopy and NMR measurements indicate that the solution undergoes deep depolymerization when water glass is acidified. Lower molecular weight silica species, specifically Si-O monomers such as SiO(OH)3- will be responsible for the depression of the gangue minerals and are the drivers of the selectivity of AWG, more than orthosilicic acid. Depolymerization is more or less effective depending on the mass ratio of the acid to water glass and depending on the acid.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 5; 797-817
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Value added industrial minerals production from calcite-rich wollastonite
Wartość dodana produkcji surowców przemysłowych ze złóż kalcytu i wollastonitu

Autorzy:

Bulut, Gülay
Akçin, Elif Suna
Kangal, Murat Olgaç

Powiązania:

https://bibliotekanauki.pl/articles/216790.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

wollastonite
calcite
flotation
industrial minerals
wollastonit
kalcyt
flotacja
surowce przemysłowe

Opis:

The worldwide consumption of wollastonite has been increasing from day to day. It is a calcium metasilicate with the chemical formula CaSiO₃. Wollastonite is the only naturally occurring, nonmetallic, white mineral that is needle-shaped in a crystal habit. Due to its high chemical and thermal resistance and nontoxic properties, wollastonite replaces asbestos. Apart from this, the acicular property of wollastonite allow it to compete with other acicular materials where improvements in dimensional stability, flexural modulus and heat deflection are sought. Due to its unique properties such as: its high brightness and whiteness, low moisture and oil absorption, low volatile content, and acicular properties, it is used also as a filling material for ceramics, plastics and paints, thermal and electrical insulator, wetting agent and smelter for glaze. Three methods are used for the beneficiation of wollastonite: mechanical sorting, dry or wet magnetic separation and flotation. Magnetic separation and flotation can be applied together in some cases. In this study, flotation has been investigated for the selective separation of calcite-rich wollastonite ores from the Buzlukdağ deposit, in the Kırşehir-Akpınar region, in the middle of Anatolia. The mineralogical analysis of the sample used in the study shows that the ore sample contains 60–62% wollastonite (CaSiO₃), 4–5% augite (Ca,Na)(Mg,Fe,Al)(Si,Al)₂O₆, 30–32% calcite (CaCO₃) and minor amount of other minerals. As a result of this study, the wollastonite concentrate which contains 0.44% Fe₂O₃, 52.71% SiO₂, 87.85% wollastonite with 0.60% loss on ignition (using 1500 g/t potassium oleate) was obtained. The ultimate grade concentrates of calcite that can also be obtained as by-products are with 99.80% calcite content and 85.4% recovery.
Światowe zużycie wollastonitu ciągle wzrasta. Wollastonit jest metakrzemianem wapnia o wzorze chemicznym CaSiO₃. Jest jedynym naturalnie występującym, niemetalicznym, białym minerałem, który ma kształt igieł o pokroju kryształu. Wollastonit ze względu na wysoką odporność chemiczną i termiczną oraz właściwości nietoksyczne zastępuje azbest. Poza tym igiełkowa właściwość wollastonitu umożliwia konkurencję z innymi igiełkowymi materiałami, w zakresie poprawy stabilności wymiarowej, modułu zginania i ugięcia pod wpływem ciepła. Ze względu na swoje unikalne właściwości, takie jak: wysoka jasność i biel, niska wilgotność i absorpcja oleju, niska zawartość części lotnych i właściwości igiełkowe, umożliwia zastosowanie jego jako: materiału wypełniającego do ceramiki, tworzyw sztucznych i farb, izolatora termicznego i elektrycznego, środka zwilżającego i pieca do glazury. Do wzbogacania wollastonitu stosowane są trzy metody: sortowanie mechaniczne, separacja magnetyczna na sucho lub mokro oraz flotacja. W niektórych przypadkach można zastosować zarówno separację magnetyczną, jak i flotację. W tym artykule zastosowano flotację w celu selektywnego oddzielania rud kalcytu i wollastonitu ze złoża Buzlukdağ w regionie Kırşehir-Akpınar w centrum Anatolii. Analiza mineralogiczna próbki użytej w badaniu pokazuje, że próba rudy zawiera 60–62% wollastonitu (CaSiO₃), 4–5% augitu (Ca, Na)(Mg, Fe, Al)(Si, Al)₂O₆, 30–32% kalcytu (CaCO₃) i niewielką ilość innych minerałów. W wyniku tych badań uzyskano koncentrat wollastonitu, który zawiera 0,44% ‒ Fe₂O₃, 52,71% ‒ SiO2, 87,85% wolastonitu przy stratach wynoszących 0,60% (przy użyciu 1500 g/Mg oleinianu potasu). Końcowe koncentraty kalcytu, które można również otrzymać jako produkty uboczne, zawierają 99,80% kalcytu i 85,4% odzysku.

Źródło:

Gospodarka Surowcami Mineralnymi; 2019, 35, 1; 43-58
0860-0953

Pojawia się w:

Gospodarka Surowcami Mineralnymi

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Temperature and isotopic relations in the Middle Miocene sandstones from the Ukrainian Carpathian Foredeep Basin - a reconnaissance study

Autorzy:

Jarmołowicz-Szulc, K.
Kozłowska, A.
Kuberska, M.

Powiązania:

https://bibliotekanauki.pl/articles/191662.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Geologiczne

Tematy:

isotopes
fluid systems
sandstones
calcite cement
Middle Miocene
Carpathian Foredeep
Ukraine

Opis:

Studies of the Middle Miocene sandstones in selected wells from the western Ukraine concerned calcite cements, both from isotopic and fluid inclusion aspects. The aim of the reconnaissance study was to find out inclusion – isotopic constraints for the calcite cements in the sandstones. The studied sandstones are subarkosic, sporadically sublithic arenites. The delta¹³¹⁸

Źródło:

Annales Societatis Geologorum Poloniae; 2011, 81, No 1; 79-86
0208-9068

Pojawia się w:

Annales Societatis Geologorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Evidence of amorphous Ca-phosphate precipitate caused by bio mineralisation in 4-5th CE lime plasters of the previously submerged east coastal monument of Salvankuppam

Autorzy:

Singh, Manager R.
Kumar, S. Vinodh
Ganaraj, Kuntikana

Powiązania:

https://bibliotekanauki.pl/articles/2086560.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

Amorphous Ca-phosphate
16S rRNA
Bio-mineralization
calcite
lime plasters

Opis:

The lime plasters of the excavated monument of Salvankuppam, previously submerged and exposed by the Tsunami occurred in the Indian Ocean on 26th December 2004 was studied with different analytical techniques. The temple is dated 4-5th century CE. The XRF, XRD, FTIR, NMR, SEM-EDX analysis of the lime plasters evidenced particular occurrence of phosphatised bacterial remains in saline conditions. The formation of amorphous Ca-phosphate by bio mineralization was identified in the plasters by the analyses. The plasters are made of air-lime with coarse aggregates and seashells inclusion as confirmed by the thermal and chemical analysis. The microstructure and morphological investigations of mineralized microbial structures by SEM-EDX indicated the formation of amorphous Ca-phosphate. The unordered and fibrous spherulites have hardened and reduced porosity of the plaster by bio mineralization as observed through MIP analysis. The 16S rRNA sequencing has identified the Pseudomonas strains mainly responsible for the clustering of amorphous Ca-phosphate particles around the bacterial colony.

Źródło:

Mineralogia; 2021, 52, 1; 19--30
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Tectonics of the Chęciny Anticline (Holy Cross Mts., Central Poland) in the light of new cartographic data and calcite vein analysis

Autorzy:

Jurewicz, E.
Stępień, U.

Powiązania:

https://bibliotekanauki.pl/articles/2058973.pdf

Data publikacji:

2012

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Holy Cross Mountains
Variscan folding
calcite veins
extensional fractures
faults
tectonic breccia

Opis:

The Variscan orogeny of NE–SW compression has folded the Paleozoic core of the Holy Cross Mountains (Central Poland). The Chęciny Anticline, formed during this tectonic event, is located in the southwestern part of the Kielce Unit. This paper presents structural data from two newly found outcrops of Cambrian rocks that modify the geometric reconstruction of the Chęciny Anticline, especially within its southern limb that is subdivided into two second-order structures: the Rzepka Syncline and the Wrzosy Anticline. The eastern part of the Chęciny Anticline has been reconstructed, pinpointing its fragmentation into a series of blocks (horsts and grabens) separated by faults semi-perpendicular to the anticline axis. New mapping data reveals deep, pre-Triassic erosion of folded Variscan basement, uncovering Cambrian rocks outcropping in the hinge of the Wrzosy Anticline. In the Chęciny Anticline, folding-related shortening has been accompanied by along-strike extension and the formation of syn-tectonic calcite veins, which filled fractures oriented perpendicular to the fold axis. The magnitude of extension has been estimated along a 215 m long main quarry wall of Rzepka Hill, approximately parallel to the Variscan structures and located within the southern limb of the Chęciny Anticline. The total thicknesses of veins filling extension fractures and spaces between clasts in tectonic breccia were summed and indicate 8.4% of strike-parallel extension (~120o) in the Chęciny area. This value was compared to ca. 30% of folding-induced shortening, related to NE–SW late Variscan compression. We hence obtain a strain ratio of 30:8.4 = 3.5. This high value of strain ratio indicates that longitudinal extension was a significant component contributing to the late Variscan deformation in the Kielce Unit.

Źródło:

Geological Quarterly; 2012, 56, 1; 95-106
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Strącanie cząstek węglanu wapnia w układzie gaz-ciecz w obecności wybranych sacharydów
Precipitation of calcium carbonate particles in a gas-liquid system in the presence of selected saccharides

Autorzy:

Konopacka-Łyskawa, D.
Czaplicka, N.

Powiązania:

https://bibliotekanauki.pl/articles/2073353.pdf

Data publikacji:

2018

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

węglan wapnia
kalcyt
wateryt
precypitacja
karbonatyzacja
calcium carbonate
calcite
vaterite
precipitation
carbonation

Opis:

Węglan wapnia strącano podczas karbonatyzacji roztworów zawierającego chlorku wapnia i amoniak. Procesy prowadzono w roztworach o pH powyżej 9. Jako dodatki wpływające na przebieg precypitacji stosowano glukozę lub sacharozę o stężeniach 15, 30 i 60 mM. Najwolniej precypitacja przebiegała, gdy roztwór zawierał najniższe stężenie glukozy. Wzrost stężenia badanych sacharydów skutkował skróceniem czasu precypitacji. Otrzymane cząstki CaCO3 były mieszaniną waterytu i kalcytu, a dodatek sacharydów spowodował zwiększenie zawartości kalcytu w produktach.
Calcium carbonate was precipitated during carbonation of solutions containing calcium chloride and ammonia. The processes were carried out at pH above 9. Glucose or sucrose at concentrations of 15, 30 and 60 mM were used as additives intluencing the course of precipitation. The slowest precipitation was observed in the solution containing the lowest glucose concentration. The increase of saccharides concentration resulted in a shorter precipitation time. The CaCO3 particles consisted of a mixture of vaterite and calcite, and the saccharides addition increased the calcite content in products.

Źródło:

Inżynieria i Aparatura Chemiczna; 2018, 3; 65--66
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Selective Flotation of Barite and Associated Minerals: A Comparative Study
Flotacja barytu i minerałów towarzyszących: analiza porównawcza

Autorzy:

Kecir, M.
Kecir, A.

Powiązania:

https://bibliotekanauki.pl/articles/318431.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

baryt
fluoryt
flotacja
odczynniki flotacyjne
pH
flotation
barite
fluorite
calcite
quartz
collector

Opis:

In the present socio-economical difficult context and with the oil prices fall, Algeria aims to develop its economy. For this purpose, it has to research, work and valorize not only its hydrocarbons resources, but also mineral ones, among which barite and fluorite, two industrial minerals of great importance. Because Algeria is a producer of gas and oil and a member of the OPEC, it needs important quantities of barite. This mineral plays a leading role in the oil industry, where it’s a major ingredient of the drilling muds. As for fluorite, it is essentially used as flux in metallurgy, especially as the country has a huge iron deposit in Gara Djebilet, with a potential of 2,5 billions tons, that will support the steel platform of Algeria. Particularly interesting areas with reserves of almost 300 000 tonnes of fluorite have been highlighted in the Hoggar in Sahara. In order to answer the requirements of the mentioned uses, barite and fluorite ores have to undergo an appropriate processing. The method here applied is flotation, during which different reagents, both anionic and cationic, have been tested in order to choose those who give the best results. The aim of our study is, in a first step, a systematic flotation behaviour of barite and associated minerals, during which various collectors, combined with modifiers have been tested. Then, an artificial mixtures flotation was carried out and all the optimal conditions of flotation were applied to barite and fluorite-barite ores. Definitive choice of optimal flotation requirements focused on Petronate L (1000 g/t ; pH 6.5) for barite flotation and on Flotbel R171A (100 g/t; pH 9) for fluorite, combined with potassium dichromate as depressing agent for quartz and barite. The final flotation treatment has led to the obtention of a barite concentrate with a 93,4% BaSO4 grade and a fluorite concentrate with 93,6% CaF2,both answering the users’ requirements.
W obecnej trudnej sytuacji socjoekonomicznej, w połączeniu ze spadkiem ceny ropy, Algieria jest nastawiona na rozwój ekonomiczny. W tym celu należy przeprowadzić badania, prace i waloryzację zasobów nie tylko surowców węglowodorowych, lecz również mineralnych, do których można zaliczyć baryt i fluoryt – dwa istotne minerały przemysłowe. Z racji tego, że Algieria prowadzi wydobycie gazu i ropy oraz jest członkiem OPEC, ma wysokie zapotrzebowanie na baryt. Minerał ten ma kluczowe znaczenie w przemyśle naftowym jako główny składnik iłowych płuczek wiertniczych. Fluoryt jest używany jako substancja zmiękczająca w metalurgii. Jest to istotne z powodu dużego złoża znajdującego się w tym kraju w GaraDjebilet, której zasoby sięgają 2,5 miliardy ton. Szczególnie interesujące tereny z zasobami fluorytu dochodzącymi do 300 000 ton mieszczą się w Hoggar na Saharze. W odpowiedzi na zapotrzebowanie przemysłu rudy barytu i fluorytu muszą być poddawane wzbogacaniu. Zastosowano flotację, podczas której badano odczynniki, zarówno anionowe jak i kationowe. Celem badań, w pierwszym etapie, było określenie wyników (efektów) flotacji barytu i minerałów towarzyszących, podczas której testowano różne kolektory wraz z ich modyfikatorami. Następnie przeprowadzono flotację sztucznych mieszanek oraz określono optymalne warunki flotacji rud barytu i fluorytu. Ostateczny wybór najlepszych parametrów technologicznych flotacji, został oparty na odczynniku zbierającym Petronate L (1000 g/t; pH=6,5) dla flotacji barytu oraz na Flotbel R171A (100 g/t; pH=9) dla fluorytu, w połączeniu z dichromianem potasu, jako czynnika depresyjnego dla kwarcu i barytu. Optymalny proces flotacji doprowadził do otrzymania koncentratu barytu z BaS04 na poziomie 93,4% i koncentratu fluorytu zawierającego 93,6% CaF2. Oba spełniają wymogi użytkowników.

Źródło:

Inżynieria Mineralna; 2015, R. 16, nr 2, 2; 117-124
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Preparation and characterization of calcite for tannic acid adsorption: Optimization by response surface methodology coupled by Box-Cox transformation procedure

Autorzy:

Tangarfa, Mariam
Hassani, Naoul Semlali Aouragh
Alaoui, Abdallah

Powiązania:

https://bibliotekanauki.pl/articles/1447160.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

calcite
tannic acid
adsorption parameters
optimization
Response Surface Methodology
Box-Cox transformation

Opis:

Calcite depression is the most effective physicochemical process to valorize fluorine mineral. This process is achieved by adsorption of tannic acid, as the commonly used reagent, onto calcite. Adsorption investigation is very important in mineral processing. The present work focuses on optimization of physicochemical parameters of tannic acid adsorption onto calcite. Experimental study is carried out by a response surface methodology based on Box-Behnken design. Obtained results are exploited to develop a statistical model. Analysis of variance and residuals are performed to check the significance of tested models. Among these models, Cox-Box model predicts very well the obtained experimental data. This model shows that initial tannic acid concentration and solution pH as well as their interactions are the most significant parameters. Optimal conditions are achieved using the obtained statistical model. The present investigation is an important preliminary step to better understand calcite flotation behavior using tannic acid as a depressant.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 3; 36-45
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Middle to Late Jurassic carbonate-biosiliceous sedimentation and palaeoenvironment in the Tethyan Fatricum Domain, Krížna Nappe, Tatra Mts, Western Carpathians

Autorzy:

Jach, Renata
Reháková, Daniela

Powiązania:

https://bibliotekanauki.pl/articles/191204.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Geologiczne

Tematy:

radiolarite
nodular limestone
Fleckenmergel facies
carbonate production crisis
calcite compensation depth
Tethys

Opis:

The Jurassic of the Alpine-Mediterranean Tethys was characterized by the formation of several interconnected basins, which underwent gradual deepening and oceanization. Sedimentation in each basin was influenced by a specific set of interrelated factors, such as tectonic activity, seawater circulation, climate, chemistry and trophic state of seawater as well as evolutionary changes of the marine biota. This paper deals with the Fatricum Domain (Central Carpathians, Poland and Slovakia), which in the Jurassic was a pull-apart basin on a thinned continental crust. The sedimentation history of this domain during the Bajocian-Tithonian and its governing factors have been revealed. Facies analysis of the Bajocian-Oxfordian deposits evidences considerable relief of the basin-floor topography. Deposits in the Western Tatra Mts represent sedimentation on a submarine intrabasinal high, whereas the coeval deposits of the eastern part of the Tatra Mts accumulated in a deeper basin. The basin succession began with Bajocian bioturbated “spotted” limestones and siliciclastic mudstones (Fleckenmergel facies). These were succeeded by uppermost Bajocian - middle Bathonian grey nodular limestones, affected by synsedimentary gravitational bulk creep. The coeval deposits of the intrabasinal high are represented by well-washed Bositra-crinoidal limestones with condensed horizons. Uniform radiolarite sedimentation commenced in the late Bathonian and persisted until the early late Kimmeridgian. The basal ribbon radiolarites (upper Bathonian - lower Oxfordian), which consist of alternating chert beds and shale partings, are a record of seawater eutrophication, a related crisis in carbonate production and the rise of the CCD, which collectively resulted in biosiliceous sedimentation. The overlying calcareous radiolarites (middle Oxfordian - lowermost upper Kimmeridgian) marked a gradual return to carbonate sedimentation. The return of conditions that were favourable for carbonate sedimentation took place in the late Kimmeridgian, when the red nodular limestones were deposited. They are partly replaced by basinal platy limestones (uppermost Kimmeridgian - Tithonian) in the Western Tatra Mts. This lateral variation in facies reflects a change in the sedimentary conditions governed by a bathymetric reversal of the seafloor configuration, attributed to a further stage in the pull-apart transcurrent tectonics of the Fatricum Domain.

Źródło:

Annales Societatis Geologorum Poloniae; 2019, 89, 1; 1-46
0208-9068

Pojawia się w:

Annales Societatis Geologorum Poloniae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Water contact angle on corresponding surfaces of freshly fractured fluorite, calcite and mica

Autorzy:

Kowalczuk, P. B.
Akkaya, C.
Ergun, M.
Janicki, M.
Sahbaz, O.
Drzymala, J.

Powiązania:

https://bibliotekanauki.pl/articles/110595.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

contact angle
surface properties
cleaving plane
surface composition
corresponding halves
fluorite
calcite
mica

Opis:

Advancing and receding contact angles of water with corresponding surfaces of freshly fractured calcite, fluorite and mica were measured. The corresponding surfaces were obtained by mechanical splitting of a small lump of each mineral into two pieces. Theoretical considerations revealed that depending on the mineral cleaving plane, surfaces created by splitting into halves can be either identical or entirely different as far as their surface chemical composition is concerned. It was experimentally established that receding and advancing contact angles measured on the corresponding surfaces of fluorite, calcite and mica were identical for the sessile drop method. When the contact angle was measured by the captive bubble approach, there were small differences in the contact angles measured on the corresponding surfaces of fluorite. It was most probably due to surface irregularities and roughness, and therefore different times needed to rupture the liquid film between the bubble and solid surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 1; 192-201
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Właściwości i zastosowanie kalcytu w przemyśle
Properties and industrial uses of calcite

Autorzy:

Bartczak, Martyna

Powiązania:

https://bibliotekanauki.pl/articles/24085341.pdf

Data publikacji:

2023

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

kalcyt
węglan wapnia
zastosowanie w przemyśle
ceramika
szpat
calcite
calcium carbonate
industrial uses
ceramics

Opis:

Kalcyt jest pospolitym minerałem skałotwórczym z grupy węglanów o składzie chemicznym węglanu wapnia (zwany również kalcytem lub podwójnym drzewcem i alternatywnie pisany kalcytem). Należy do ogólnej kategorii minerałów węglanów i azotanów. Swoją nazwę zawdzięcza połączeniu dwóch słów – greckiego chalix i łacińskiego calx, co oznacza wapno. Minerał ten jest jednym z najczęstszych składników kamieniotwórczych, którego kryształy tworzą m.in. wapienia, marmury i oolity. Występuje w wielu kolorach na całym świecie i stanowi ponad 4% światowej gleby. Kalcyty w czystej postaci są kolorowe i przezroczyste. Aragonit i dolomit są pod wieloma względami bardzo podobne do środowiska geologicznego kalcytu. Minerał ten znajduje zastosowanie w wielu dziedzinach naszego życia a jego wydobycie sięga już początku XX wieku (na Wyżynie Krakowsko-Częstochowskiej). Artykuł ma na celu przedstawienie wybranych zastosowań kalcytu oraz opisanie jego właściwości.
Calcite is a common rock-forming mineral from the carbonate group with the chemical composition of calcium carbonate. It belongs to the general category of carbonate and nitrate minerals. It owes its name to a combination of two words - the Greek chalix and the Latin calx, which means lime. This mineral is one of the most common stone-forming ingredients, whose crystals form e.g. limestones, marbles and oolites. It comes in many colors around the world and makes up over 4% of the world's soil. Pure calcites are colored and transparent. Aragonite and dolomite are in many respects very similar to the geological environment of calcite. This mineral is used in many areas of our lives and its extraction dates back to the beginning of the 20th century (in the Kraków-Częstochowa Upland). The article aims to present selected applications of calcite and describe its properties.

Źródło:

Archiwum Wiedzy Inżynierskiej; 2023, 8, 1; 15--17
2544-2449

Pojawia się w:

Archiwum Wiedzy Inżynierskiej

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Biomateriały implantacyjne dotowane srebrem – próby wstępne. Cz.2 – Materiały kalcytowe
Silver containing biomaterials – preliminary studies. Part 2 – Calcite implants

Autorzy:

Jaegerman, Z.
Michałowski, S.
Ciołek, L.
Wiśniewski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/392272.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych

Tematy:

implant
biomateriał
węglan wapnia
kalcyt
bakteriobójczość
nanosrebro
biomaterial
calcium carbonate
calcite
antimicrobial activity
nanosilver

Opis:

Niniejszy artykuł jest kontynuacją opisu badań biomateriałów dotowanych srebrem, który został zamieszczony w poprzednim (22) numerze „Prac Instytutu Ceramiki i Materiałów Budowlanych”. Głównym celem prac badawczych było opracowanie wstępnych założeń otrzymywania wszczepialnych materiałów kalcytowych wykazujących działanie przeciwbakteryjne. Do przygotowania materiałów kalcytowych wykorzystano tworzywo ceramiczne na bazie węglanu wapnia, a jako źródła nanosrebra użyto dwóch rodzajów bioszkieł ze srebrem, opracowanych w Instytucie Ceramiki i Materiałów Budowlanych. Do badań przygotowano 8 próbek tworzyw kalcytowych zawierających różne ilości bioszkieł. Oznaczono ich gęstość pozorną, porowatość całkowitą i wytrzymałość na ściskanie. Wykonano badania mikrostruktury przy użyciu skaningowego mikroskopu elektronowego oraz badania działania przeciwbakteryjnego z wykorzystaniem bakterii Pseudomonas aeruginosa oraz Staphylococcus aureus. Przeprowadzone badania pokazały, że zarówno ilość, jak i rodzaj dodawanego bioszkła mają wpływ na właściwości fizyczne materiałów. Obserwacje mikrostruktury materiałów zawierających bioszkła wykazały, że ziarna bioszkieł w temperaturze spiekania materiału kalcytowego (510°C) nie łączą się z ziarnami kalcytowymi. Zjawisko to może być jedną z przyczyn obniżania wytrzymałości na ściskanie ze wzrostem zawartości bioszkła w materiale. Wyniki badania bakteriobójczości wskazały na zdecydowane obniżenie ilości bakterii dla obu materiałów kalcytowych w stosunku do hodowli kontrolnej w każdym okresie inkubacji. Przeprowadzone badania wykazały, że zastosowana metoda dotowania materiałów kalcytowych srebrem pozwala na otrzymanie materiałów wykazujących działanie przeciwbakteryjne.
The article is the continuation of description of research on silver containing biomaterials, published in the previous issue of „Prace ICiMB”. The main objective of the research was to develop initial assumptions on the production of calcite implants showing antibacterial activity. Ceramic material based on calcium carbonate, as well as two types of silver containing bioglasses developed in ICiMB were used in the preparation of calcite materials. Eight test calcite samples containing different amounts of bioglasses were prepared. Apparent density, total porosity and compressive strength were determined. Analysis of materials microstructure using scanning electron microscopy and study of antimicrobial activity using Pseudomonas aeruginosa and Staphylococcus aureus bacteria were performed. The studies showed that both the content and type of bioglass affect the physical properties of the materials. Microscopic observations showed that grains of bioglass do not sinter in the temperature of 510°C, that corresponds to the sintering temperature of calcite material. This phenomenon can be one of the reasons that compressive strength decreases with the increase of the content of bioglass in the material. Analysis of bactericidal effect showed a significant reduction of the bacteria count for both calcite materials in comparison to the control culture, at all periods of incubation. The results of the study have shown that the method of silver doping of calcite materials allows to obtain implants with antibacterial activity.

Źródło:

Prace Instytutu Ceramiki i Materiałów Budowlanych; 2015, R. 8, nr 23, 23; 28-38
1899-3230

Pojawia się w:

Prace Instytutu Ceramiki i Materiałów Budowlanych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Kalcyty blokowe ze szczelin tektonicznych w piaskowcach płaszczowiny magurskiej (Karpaty Zewnętrzne) - wstępne wyniki badań
Blocky calcites from tectonic fractures hosted in sandstones of the Magura Nappe (Outer Carpathians) - preliminary results

Autorzy:

Duś-Picheta, A.

Powiązania:

https://bibliotekanauki.pl/articles/183956.pdf

Data publikacji:

2008

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

żyły kalcytu blokowego
cementacja piaskowców
płaszczowina magurska
blocky calcite veins
sandstone cementation
Magura Nappe

Opis:

Badano żyły kalcytu blokowego wypełniające szczeliny ciosowe. Opróbowano piaskowce oraz żyły kalcytowe w strefie raczańskiej (Gruszowiec) oraz w strefie Siar (Ropica Górna 1, Ropica Górna 2) płaszczowiny magurskiej. Celem badań było określenie relacji pomiędzy kalcytem blokowym z żył i stopniem utwardzenia piaskowców otaczających. Badania petrograficzne płytek cienkich uzupełniono badaniami chemicznymi oraz obserwacjami w katodoluminescencji. Badane kalcyty blokowe charakteryzują się różnym stopniem żelazistości. Intensywność ich luminescencji pozytywnie koreluje się z zawartością Mn2+. Na podstawie wyników analizy kontaktów międzyziarnowych w piaskowcach oraz relacji żył do cementów i ziaren w piaskowcach stwierdzono, że żyły kalcytu blokowego powstawały na różnym etapie utwardzenia skał płaszczowiny magurskiej. Mikrostruktury oraz różny stopień żelazistości kalcytów blokowych mogą być użyte jako wskaźniki kierunku cementacji szczelin tektonicznych.
Blocky calcite veins filling joints have been studied in sandstones. Calcite veins and host sandstones were sampled in Raca Unit (exposure Gruszowiec) and in Siary Unit (exposures Ropica Górna 1 and Ropica Górna 2). The aim of these studies was to define relationship between blocky calcite in veins and progress of sandstone induration. In the paper, petrographic study was supplemented by chemical analyses and cathodoluminescence observations. Studied blocky calcites show different Fe contents. Intensity of blocky calcite luminescence shows a good correlation with Mn2+ contents. Based on results of grain-contact analysis in sandstones and on relationship between veins and cement in sandstones as well as framework grains, it is concluded that blocky calcite veins were formed in rocks showing different stage of induration. Microstructures and differentiation in Fe contents in blocky calcite may be used as indicators of direction filling in tectonic fractures.

Źródło:

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2008, 34, 3; 561-571
0138-0974

Pojawia się w:

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Badania procesu spiekania aragonitu i kalcytu w obecności fluorku litu
Research on the sintering process of aragonite and calcite in the presence of lithium fluoride

Autorzy:

Jaegermann, Z.
Szterner, P.
Tymowicz-Grzyb, P.
Piątek, M.

Powiązania:

https://bibliotekanauki.pl/articles/168974.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych

Tematy:

aragonit
kalcyt
fluorek litu
spiekanie
badania termiczne
aragonite
calcite
lithium fluoride
sintering
thermal analysis

Opis:

W pracy przedstawiono wyniki badań nad spiekaniem dwóch odmian krystalograficznych węglanu wapnia: aragonitu i kalcytu, z dodatkiem fluorku litu. Aby prześledzić zjawiska termiczne zachodzące podczas ogrzewania, wykonano badania jednoczesnej analizy termicznej TG/DTA próbek modelowych. Oznaczenie zmian wymiarów liniowych próbek przeprowadzono wykonując badania dylatometryczne, a obrazy morfologii proszków i mikrostruktury materiałów wykonano przy użyciu mikroskopu skaningowego. Wyniki wykonanych badań wykazały, że procesy spiekania aragonitu i kalcytu przebiegają w zbliżony sposób. Podstawową różnicę stanowi zjawisko rozszerzania próbki aragonitu w temp. ok. 330°C, związane prawdopodobnie z przemianą fazową aragonit/kalcyt, co nie ma widocznego wpływu na temperaturę maksymalnej szybkości zmian wymiarów liniowych, ani na poziom zagęszczenia materiałów po wypaleniu.
The paper presents results of study of sintering process of two crystallographic forms of calcium carbonate: aragonite and calcite, doped with lithium fluoride. To investigate the thermal phenomena occurring during heating, simultaneous thermal analysis of model samples were carried out. Determination of changes in linear dimensions of the samples was made by dilatometric tests. Microstructure images were taken using the scanning microscope. The results of the tests showed that sintering processes of aragonite and calcite run in a similar manner. The main difference is the phenomenon of aragonite expansion at approx. 330°C, probably related to aragonite/calcite phase transformation, which has no effect on temperature of the maximum rate of change in linear dimensions, nor on the densification degree after firing.

Źródło:

Szkło i Ceramika; 2018, R. 69, nr 4, 4; 15-19
0039-8144

Pojawia się w:

Szkło i Ceramika

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Miocene transpression effects at the boundary of Central Carpathian Paleogene Basin and Pieniny Klippen Belt - examples from Polish-Slovakian borderland

Autorzy:

Ludwiniak, M.

Powiązania:

https://bibliotekanauki.pl/articles/184548.pdf

Data publikacji:

2018

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

structural geology
tectonics
Western Central Carpathians
Podhale basin
Spišska Magura
faults
folds
joints
calcite veins

Opis:

A geological structural study has been conducted along the tectonic contact zone of the Central Carpathian Paleogene Basin (CCPB) and Pieniny Klippen Belt (PKB) in the eastern Podhale and western Spišska Magura areas. It concerned mostly the Central Carpathian Paleogene flysch strata and, to a lesser degree, the Upper Cretaceous rocks of the PKB. Tectonic deformation structures genetically related to the important tectonic boundary in question occur within a c. 1.5–2 km-wide strip of the Paleogene flysch rocks adjacent from the south to the PKB. Two parallel structural domains have been distinguished within this strip: the contact zone proper in the north and the peri-Pieniny monocline in the south. Most of the minor faults documented in the Paleogene flysch bear a record of dextral motion parallel to the contact zone. Some dextral-reverse oblique slip faults of NE-SW and W-E trends have also been recognized. Discrepancies in the orientation and sense of movement on strike-slip faults in the Paleogene flysch rocks and those in marlstones of the “klippen envelope” of the PKB were encountered. They probably reflect differences in the structural history of both the adjacent rock complexes, as the Upper Cretaceous deposits of the PKB must have experienced more deformation events and, in general, were affected by much more intense strain than those of the CCPB. Contractional structures, such as south-vergent reverse faults and recumbent folds which point to ca N-S tectonic shortening, have also been found in the Paleogene rocks. The entirety of the structural features found in the CCPB is characteristic of a transpressional regime. The regionally consistent coexistence of structures resulting from strike-slip movements and tectonic shortening, as well as features pointing directly to a transpressional regime, prove the transpressional dextral nature of the contact between the CCPB and PKB.

Źródło:

Geology, Geophysics and Environment; 2018, 44, 1; 91-100
2299-8004
2353-0790

Pojawia się w:

Geology, Geophysics and Environment

Dostawca treści:

Biblioteka Nauki

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Tytuł:

Surface Characterization of Oleic Acid Coated Marble Dust
Charakterystyka powierzchni pyłu marmurowego pokrytego kwasem oleinowym

Autorzy:

Polat, Ercan
Guler, Taki
Celep, Oktay
Akturk, Selçuk

Powiązania:

https://bibliotekanauki.pl/articles/318754.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

surface modification
oleic acid
marble waste
micronized calcite
modyfikacja powierzchni
kwas olejowy
odpady marmurowe
mikronizowany kalcyt

Opis:

Calcite, being the most abundant mineral on earth crust, have wide application areas especially in polymer industry as a micronized functional filler material. It is hydrophilic in natural form, and made hydrophobic after surface modification to meet the requirements of polymer industry: the incompatibility between high energetic hydrophilic surface of calcite and the low-energy surface of hydrophobic polymers is a major problem. Treatment of micronized calcite with fatty acids is one of the most common method to obtain modified mineral surface. In present study, oleic acid (OA), fatty acid type surface modifying agent was used for the surface characterization of OA coated marble dust. Fine tailings of slab cutting unit of a marble processing plant was supplied. The sample was subjected to wet classification process to obtain micronized calcite fraction for experimental works. Surface modification of finely sized fraction was performed in a laboratory type flotation unit. Thermogravimetric analysis (TGA) and Transmission Electron Microscopy (TEM) were used as characterization techniques.
Kalcyt, będący najczęściej występującym minerałem w skorupie ziemskiej, ma szerokie obszary zastosowań, szczególnie w przemyśle polimerowym, jako mikronizowany funkcjonalny materiał wypełniający. Jest hydrofilowy w naturalnej postaci, a po modyfikacji powierzchni stał się hydrofobowy, aby spełnić wymagania przemysłu polimerów: niekompatybilność między wysokoenergetyczną hydrofilową powierzchnią kalcytu a niskoenergetyczną powierzchnią hydrofobowych polimerów jest poważnym problemem. Obróbka mikronizowanego kalcytu kwasami tłuszczowymi jest jedną z najczęstszych metod uzyskiwania modyfikowanej powierzchni mineralnej. W niniejszym badaniu do charakteryzowania powierzchni pyłu marmurowego pokrytego OA - kwasem oleinowym (OA), jako środek modyfikujący powierzchnię użyto kwasu tłuszczowego. Do badań wykorzystano drobne odpady z urządzenia do cięcia płyt w zakładzie przeróbki marmuru. Próbkę poddano procesowi mokrej klasyfikacji w celu uzyskania mikronizowanej frakcji kalcytu do prac eksperymentalnych. Modyfikację powierzchni frakcji drobnej wielkości przeprowadzono w laboratoryjnej jednostce flotacyjnej. Jako do scharakteryzowana próbek zastosowano analizę termograwimetryczną (TGA) i transmisyjną mikroskopię elektronową (TEM).

Źródło:

Inżynieria Mineralna; 2020, 1, 1; 125-129
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

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