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Wyświetlanie 1-15 z 35
Tytuł:
Extracellular polymeric substance of Rhodococcus opacus bacteria effects on calcium carbonate formation
Autorzy:
Szcześ, A.
Czemierska, M.
Jarosz-Wilkołazka, A.
Magierek, E.
Chibowski, E.
Hołysz, L.
Powiązania:
https://bibliotekanauki.pl/articles/109802.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
calcium carbonate
exopolymer
mineralization
Opis:
An extracellular substance extracted from the bacterial strain Rhodococcus opacus was used as a template for calcium carbonate precipitation from CaCl2 and Na2CO3 solutions at 25 and 37 °C. Obtained crystals were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Raman spectroscopy. Kinetics of precipitation was investigated by conductivity measurements. The obtained results show that the used biopolymer does not affect the crystal structure but acts as a nucleation centers leading to the formation of calcite crystals with the regular size. This effect is concentration dependent i.e. the EPS concentration increase causes the crystal size decreases, and is greater if calcium chloride solution if mixed with EPS 15 min before the addition of sodium carbonate solution. The temperature increase strengthens this effect.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 1; 142-150
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioceramic micro and nanoparticles as functional biological materials
Autorzy:
Parakhonskiy, B.
Saveleva, M.
Svenskaya, Y.
Ivanova, A.
Lengert, E.
Alebastrova, A.
Yashchenok, A.
Gorin, D.
Bukreeva, T.
Marchenko, I.
Douglas, T.
Skirtach, A.
Powiązania:
https://bibliotekanauki.pl/articles/284720.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
calcium carbonate
biomaterials
properties
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 77
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing Creep Rate of polypropylenes by Soaking Solid solutions of CaCO3
Autorzy:
Hussain, Randa K.
Dagher, Hala F.
Khudadad, Rasol Rahman
Powiązania:
https://bibliotekanauki.pl/articles/1182918.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
creep
polypropylene
calcium carbonate
creep rate
Opis:
The creep behavior of Polypropylene and Polypropylene/Calcium Carbonate were investigated by tested them at different concentration of Calcium carbonate filler (filler addition is done by soaked pp samples in CaCO3 solution) at different temperatures. A dramatically changed in the FTIR was observed when pp soaked in CaCO3 solution comparing with pristine one. It was found that the creep rate was lowered comparing to the pure Polypropylene. The Creep behavior of the polymer formed was observed to increase with increase in temperature and stress, Calcium carbonate enhanced creep rate and rapture time.
Źródło:
World Scientific News; 2016, 49, 2; 90-103
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Precipitated calcium carbonate production, synthesis and properties
Autorzy:
Erdogan, N.
Eken, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/110023.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
precipitated calcium carbonate
waste marble powder
whiteness
Opis:
Calcium carbonate (CaCO3) is the most widely used filler material in paper, paint, plastic, food, ceramic, cosmetic, medicine and other industries. In the present paper, precipitated calcium carbonate (PCC) has been produced from waste marble powder (WMP) by the Calcination-Dissolution-Precipitation (CDP) method. Calcination, dissolution and precipitation experiments were carried out under various conditions including : calcination temperature (800, 850, 900, 950 and 1000 °C), dissolution time (2.5, 5.0, 7.5 and 10.0 min) and precipitation time (2.5, 5.0, 7.5, 10.0, 12.5 and 15.0 min). Then, XRF, XRD, SEM, particle size, whiteness, brightness and yellowness analyses were performed for the characterization of the produced PCC materials. The analyses showed that the precipitate was mainly micrometer-sized (d50 = 1.682 μm) rhombohedral calcium carbonate crystals with 54.5% CaO. The whiteness, brightness and yellowness tests of the precipitates, conducted by Datacolor Elrepho 450x spectrometer, were determined to be 91.28, 98.2 and 1.99%, respectively. It was finally concluded that the produced PCC material reasonably meets Turkish Standards (TS 11653/1995) and can be used in paper industry.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 57-68
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of process of removing impurities from calcium carbonate
Autorzy:
Hann, D.
Kortnik, J.
Powiązania:
https://bibliotekanauki.pl/articles/110465.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
calcium carbonate
flotation of graphite
ISO brightness
Opis:
Calcium carbonate is used as an additive in the production of paper and some other production processes. The aim of this study was to determine the chances of the calcite sample to be mechanically cleaned of impurities, so that the material can become commercially interesting, primarily to be sold to the paper and other-related industries. A mineralogical petrographic investigation carried out on a sample of calcite showed that an unfavorable impurity is, in particular, graphite – which is otherwise fairly easily to remove by flotation. Flotation was performed with samples of different particle size. The purpose of this was to find an optimal particle size for carrying out the flotation. In order to achieve an effective flotation results it is first necessary to achieve a proper liberation of grains. The second part of the study was to explore the optimal sequence of treatment procedures for tested calcite, using milling, flotation, and sedimentation.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 2; 611-619
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of CaCO3-SiO2 composite with core-shell structure and its application in silicone rubber
Autorzy:
Cui, Ch.
Ding, H.
Cao, L.
Chen, D.
Powiązania:
https://bibliotekanauki.pl/articles/778525.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
calcium carbonate
silica
silicone rubber
mechnao-chemistry
Opis:
A new CaCO3-SiO2 composite with core-shell structure was successfully prepared by mechano-chemistry method (MCM). SEM and FTIR indicated that SiO2 particles were homogeneously immobilized on the surface of CaCO3. The well dispersion of this CaCO3-SiO2 composite into silicone rubber can not only reduce the usage amount of SiO2, but also improve the mechanical properties of silicone rubber. By the calculation, the theoretical numbers of the SiO2 particles is about 10 times as large as that of CaCO3 particles in the CaCO3-SiO2 composite. Mixing CaCO3-SiO2 composite in silicone rubber can enhance the breaking strength of the silicone rubber about 18% as high as that when mixing the pure SiO2. And the elongation at break is about 14% less than that of adding the pure SiO2 sample.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 4; 128-133
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precipitation of calcium carbonate in the presence of urea at 293 K and 343 K
Autorzy:
Białowicz, K.
Kiełkowska, U.
Powiązania:
https://bibliotekanauki.pl/articles/778787.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
calcium carbonate
precipitation
sodium bicarbonate
urea
utilization
Opis:
The results of the precipitation of calcium carbonate from a waste post-distillation liquid (DS) and a sodium bicarbonate saturated solution – both from the Solvay method – in the presence of urea are presented. The investigation was carried out at 293 K and 343 K. Reagent dosage times of 1, 5, 10, 20 and 30 min, and urea concentrations of 5, 6 and 10 mol/dm3 were applied. The granulometric composition, the values of bulk and packing densities and the absorptiveness sorption of water and paraffin oil from the obtained calcium carbonate were investigated.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 2; 95-98
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental parameters conditioning microbially induced mineralization under the experimental model conditions
Autorzy:
Otlewska, Anna
Gutarowska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1038825.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
microbially induced mineralization
calcium carbonate
abiotic factors
urease
Opis:
Microbially induced calcium carbonate precipitation is one of the biomineralization types closely dependent on the parameters of the microenvironment. Minerals are precipitated as a product of environmental and bacterial cell interactions, however, this system has very little control via microorganisms. The aim of research was to determine the influence of abiotic factors (pH, temperature, agitation speed of bacterial culture and calcium ion source) on the mineralization induced by Arthrobacter sulfureus, Bacillus muralis and B. atrophaeus strains under the standard laboratory conditions. Because of the key role of urease in biomineralization, processes occurring in environments with and without the urea were compared. For this purpose, cultivation of bacteria (A. sulfureus, B. muralis and B. atrophaeus) was carried out in B4 liquid medium for 5 days with various environmental parameters (pH 6-9; temperature 25-44°C; speed of agitation 0-180 rpm, different calcium sources). It was noticed that the pH and the speed of agitation clearly affect the amount of the calcium carbonate that formed. Our observations suggest that the highest precipitation rate takes place in alkaline pH between 8-9, with shaking at 180 rpms. Among studied sources of calcium ions (calcium acetate, calcium chloride and calcium nitrate), calcium acetate demonstrated the strongest potential in the biomineralization process. Moreover, work presented here demonstrates that the correlation between cultivation temperature and biomineralization process cannot be clearly evaluated. The morphology and size of calcium carbonate minerals was strain-specific, although affected by the presence of urea in the surrounding solution.
Źródło:
Acta Biochimica Polonica; 2016, 63, 2; 343-351
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of polyacrylic acid molar mass as a surface modifier on rheological properties of calcium carbonate suspensions
Autorzy:
Selim, Khaled Abdelaal
Farghaly, Mohamed Galal
Abdallah, Samah Saleh
Abdel-Khalek, Mohamed Abdel-Dayem
Powiązania:
https://bibliotekanauki.pl/articles/1446411.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
calcium carbonate
surface modification
poly-acrylic acid
rheology
adsorption
Opis:
Suspensions of calcium carbonate are of a major concern in various fields, such as coating, painting and ceramics and their rheological properties are very important. The effect of polyacrylic acid (PAA) of different molecular mass as a surface modifier on the surface and rheological properties of the aqueous suspension of calcium carbonate was investigated. The effect of the volume fraction of particles and polymer concentration on the viscosity at lower shear rate was discussed. The flow behavior of the concentrated suspension in the presence of PAA can be explained by the difference of the repulsive force among particles, induced by the adsorbed polymer. The results showed that the dispersibility is more pronounced by the steric hindrance behavior rather than the electrostatic behavior.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 18-26
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calcium carbonate as an agent in acid mine water neutralization
Zastosowanie węglanu wapnia, jako środka neutralizującego kwaśne wody kopalniane
Autorzy:
Heviankova, S.
Bestova, I.
Kyncl, M.
Simkova, L.
Zechner, M.
Powiązania:
https://bibliotekanauki.pl/articles/319071.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
mine water
calcium carbonate
neutralization
woda kopalniana
węglan wapnia
neutralizacja
Opis:
Neutralization of acid mine water is the fundamental step in acid mine water treatment, accompanied by the elimination of iron, partial elimination of manganese and dissolved components of heavy metals, before its discharge into the receiving body. Most frequently lime hydrate, in the form of milk of lime, is used in the neutralization process. The negative outcome of lime hydrate application is an increase in the treated water hardness and a formation of sludge difficult to drain, which could partially be solved using calcium carbonate or combining both agents. The paper observes the effects of calcium carbonate in the neutralization of acid mine water in the locality of Jiří Mine in the Sokolov Region. Attention is paid to testing neutralization methods that are both economically favourable as well as technologically effective. Samples were studied for the time variations in pH values, initial and final concentrations of iron and manganese. Last but not least, it includes an economic appraisal considering the current costs of the agents. As for the neutralization agents, the cost savings are as much as 30% when combining the two agents; under the given conditions the sole application of calcium carbonate proved as economically unprofitable.
Podstawowym krokiem przy uzdatnianiu kwaśnych wód kopalnianych, przed ich zrzutem do odbiornika, jest ich neutralizacja, której towarzyszy usuwanie zwłaszcza żelaza, części manganu oraz części metali ciężkich obecnych w formie rozpuszczonej. Najczęściej do neutralizacji stosowany jest wodorotlenek wapnia w postaci mleka wapiennego. Negatywnym skutkiem zastosowania wodorotlenku wapnia jest podwyższenie twardości uzdatnionej wodyiwytworzenie bardzo trudnego do odwodnienia osadu, co mogłoby być częściowo rozwiązane poprzez zastosowanie węglanu wapnia, ewentualnie kombinując obydwa środki. W niniejszej pracy badano wpływ węglanu wapnia na proces neutralizacji kwaśnych wód kopalnianych z kopalnio odkrywkowej Jiří w Sokolovskim Zagłębiu Węglowym. Uwaga skierowana była na testowanie ekonomicznie opłacalnej technologicznie skutecznej neutralizacji. W próbkach badany był przebieg zmian pH w czasie, początkowe i końcowe koncentracje żelaza i manganu. Również wykonana została ocena strony ekonomicznej przy uwzględnieniu aktualnych cen środków neutralizujących. Oszczędności kosztów środków neutralizujących w kombinacji obydwu środków wynosząca 30%, samodzielne zastosowanie węglanu wapnia okazało się być, w danych warunkach, ekonomicznie nieopłacalne.
Źródło:
Inżynieria Mineralna; 2013, R. 14, nr 2, 2; 159-166
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reagent Removal of Heavy Metals From Waters of Coal Mines and Spoil Tips of the Lviv-Volyn Industrial Mine Region
Autorzy:
Mazurak, Oksana
Solovodzinska, Irina
Mazurak, Andriy
Gryncyhshyn, Nataliia
Powiązania:
https://bibliotekanauki.pl/articles/124260.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
ecological hazard
heavy metals
toxicant
mine
calcium carbonate
sodium hydroxide
Opis:
The article substantiates the efficiency of using chemical (reagent) technologies for the purification of industrial water from mines and spoil tips from heavy metals-toxicants and reducing their ecological hazard. The ecological risk indices of toxicants and their proportion in the overall level of ecological danger of the investigated object were presented. The results of experimental studies, interaction of comparative qualitative indicators of removal of heavy metal ions by inorganic reagents – calcium carbonate and sodium hydroxide were provided. It is shown that the solution of the ecological problem concerning the reduction of the toxicity level of subterminal waters of mines is their treatment with fine calcium carbonate CaCO3 that converts the heavy metal ions into hardly soluble basic carbonates or heavy metal hydroxides. Positive results concerning the efficiency of the subterminal water treatment of the «Velikomostovskaya» mine of the Chervonograd mining area by calcium carbonate were identified. That indicates a significant reduction of the ecological hazard indicator of the treated wastewater. The content of ions of most heavy metals, which precipitate in the form of basic carbonates at values close to pH = 8.5, was significantly reduced.
Źródło:
Journal of Ecological Engineering; 2019, 20, 8; 50-59
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of glacier system in migration of calcium carbonate on Svalbard
Autorzy:
Bukowska-Jania, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2051845.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
glacier system
migration of calcium carbonate
icing
cryochemical processes
Źródło:
Polish Polar Research; 2007, 2; 137-155
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mechanical properties of a mixture of high density polyethylene and calcium carbonate dedicated for packaging
Właściwości mechaniczne mieszaniny polietylenu dużej gęstości i węglanu wapnia przeznaczonej na opakowania
Autorzy:
Garbarski, J
Fabijański, M
Powiązania:
https://bibliotekanauki.pl/articles/175713.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high density polyethylene
packaging
calcium carbonate
polietylen dużej gęstości
opakowania
węglan wapnia
Opis:
Packaging made of polymeric materials is one of the most important branches of polymer processing. A very essential task which is to be solved in this area, is searching for new materials which would allow for lowering the cost while still maintaining good mechanical properties. In the current paper the attempt to decrease the cost of the HDPE intended for blow moulding of packaging by admixing CaCO3 filler is presented. The dependence of mechanical properties upon the filler content is also shown.
Opakowania wykonane z materiałów polimerowych stanowią duży obszar przetwórstwa materiałów polimerowych. Podstawowym zadaniem w tym zakresie jest wciąż poszukiwanie nowych materiałów umożliwiających zmniejszenie kosztów i zachowanie dobrych właściwości mechanicznych. W pracy podjęto próbę zmniejszenia kosztów HDPE przeznaczonego do wytwarzania opakowań przez wprowadzenie CaCO3 jako wypełniacza. Określono zmianę właściwości mechanicznych tych materiałów w zależności od zawartości napełniacza.
Źródło:
Advances in Manufacturing Science and Technology; 2013, 37, 2; 91-96
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of polymers on the grinding and rheology of ultrafine Egyptian calcium carbonate suspension
Autorzy:
Mourad, Sabreen H
Khalil, Mostafa M. H.
Abdel-Khalek, N. A.
Abdel-Khalek, M. A.
Selim, K. A.
Hassan, El-Sayed R. E.
Powiązania:
https://bibliotekanauki.pl/articles/2175428.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fillers
calcium carbonate
ultra-fine grinding
surface modifications
Mechano-chemical
activation
polymers
Opis:
The investigation of surface modification of Egyptian calcium carbonate via polymers was achieved with simultaneous ultra-fine grinding. Attrition mill and planetary mill were used for wet and dry grinding, respectively. The parameters affecting the grinding were studied such as ball number, speed and grinding time. The rheological characteristics of the aqueous calcium carbonate suspensions were studied in the presence of different types of polymers. The results indicated that the mechanical force could clearly affect the modification characteristics of calcium carbonate due to its mechanochemical effects. The viscosity of calcium carbonate suspension depends on the volume percentage or weight percentage. The dispersing agent increases the solid concentration for a given particle fineness.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 152163
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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