Temat: acid leaching - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Application of sulphuric(VI) acid leaching for magnesium removal from zinc concentrate
Autorzy:: Jarosiński, A.
Fela, K.
Powiązania:: https://bibliotekanauki.pl/articles/779955.pdf
Data publikacji:: 2007
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: koncentraty cynku
usuwanie magnezu
ługowanie kwasem siarkowym
ruda cynku
zinc concentrate
magnesium removal
chemical treatment
sulphuric(VI) acid leaching
Opis:: In this paper the results of investigation of magnesium removal from raw zinc concentrate have been presented. The raw materials derive from ZG Trzebionka and ZGH Bolesław. The differences in zinc and magnesium contents are characteristic of these materials. The experiments were carried out in the periodical reactor at 25°C using the H2SO4 solution of 20, 50, and 70% (v/v) concentration. The weight ratio of the solid phase to the liquid phase was 1:10 and 1:2. On the basis of the experimental results it can be stated that the application of sulphuric(VI) acid leaching permits to increase the zinc yield in Zn-Pb ore processing. This method permits to obtain zinc concentrate containing more than 60% Zn and MgO below 0.3% and CaO about 1.4%.
Źródło:: Polish Journal of Chemical Technology; 2007, 9, 2; 19-22
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Utilization of used contact masses from the oxidation state of sulfur(IV) oxide to suIfur(VI) oxide
Autorzy:: Trypuć, M.
Mazurek, K.
Kiełkowska, U.
Drużyński, S.
Powiązania:: https://bibliotekanauki.pl/articles/777950.pdf
Data publikacji:: 2007
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: kwas siarkowy
tlenek siarki
mocznik
katalizator wanadowy
ługowanie
sulfuric acid
sulfur oxide
urea solutions
used vanadium catalysts
leaching process
Opis:: The research was conducted to determine the influence of the urea concentration in the leaching solutions on the efficiency of recovery of vanadium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.
Źródło:: Polish Journal of Chemical Technology; 2007, 9, 3; 26-28
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The influence of leaching solution pH and addition of peroxide hydrogen on the recovery of some components from the used vanadium catalyst with urea solutions
Autorzy:: Mazurek, K.
Trypuć, M.
Białowicz, K.
Drużyński, S.
Powiązania:: https://bibliotekanauki.pl/articles/779484.pdf
Data publikacji:: 2008
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: kwas siarkowy
tlenek siarki
mocznik
katalizator wanadowy
ługowanie
sulfuric acid
sulfur oxide
urea solutions
used vanadium catalysts
leaching process
Opis:: The research was conducted to determine the influence of the pH of the leaching solutions and hydrogen peroxide addition on the efficiency of the recovery of vanadium, potassium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.
Źródło:: Polish Journal of Chemical Technology; 2008, 10, 4; 34-36
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The optimization of low-magnesium zinc concentrate production process
Autorzy:: Jarosiński, A.
Fela, K.
Powiązania:: https://bibliotekanauki.pl/articles/779226.pdf
Data publikacji:: 2009
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: koncentraty cynku
usuwanie magnezu
obróbka chemiczna
ługowanie
Zn-concentrate
magnesium removal
chemical treatment
acid leaching
Opis:: In this paper the result of the study on chemical leaching of zinc concentrate with H2SO4 solution was presented. The object of this work was to assess the effect of some parameters such as acid concentration, the leaching agent amount /stoichiometry amount or excess of acid were applied/, reaction time and temperature on the process. The investigation was performed as a active experiment according to Hartley's plan. The process optimisation procedure was based on the fuzzy logic system. Mainly, the parameters such as magnesium leaching efficiency and zinc losses were taken into account. It was stated that the highest magnesium leaching efficiency of 77.8% with low Zn-losses was reached when H2SO4 solution concentration was 2.5% for 20%-excess of acid, at temperature 25°C and process time of 1 hour.
Źródło:: Polish Journal of Chemical Technology; 2009, 11, 1; 20-23
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Extraction of vanadium compounds from the used vanadium catalyst with the potassium hydroxide solution
Autorzy:: Mazurek, K.
Białowicz, K.
Trypuć, M.
Powiązania:: https://bibliotekanauki.pl/articles/778384.pdf
Data publikacji:: 2010
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: katalizator wanadowy
ługowanie
wanad
żelazo
kwas siarkowy
wodorotlenek potasu
vanadium catalyst
leaching
recovery
vanadium
iron
sulfuric acid
potassium hydroxide
Opis:: The paper presents the results of the research on the degree of the recovery of vanadium(V) from the used vanadium catalyst with the use of KOH solution. The extraction was performed at 293 - 323 K, for 0.5 to 4 h and the catalysts of the variable grain diameter. The concentration of the extracting solution was varied in the range 5 - 20%. The optimal ratio of solid to liquid phase S/L was determined. Additionally the degree of the recovery of total iron ions was presented.
Źródło:: Polish Journal of Chemical Technology; 2010, 12, 1; 23-28
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant
Autorzy:: Mazurek, K.
Powiązania:: https://bibliotekanauki.pl/articles/779744.pdf
Data publikacji:: 2012
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: kwas siarkowy
tlenek siarki
katalizatory wanadu
ługowanie
wanad
potas
miedź
cynk
arsen
ołów
XRF
sulfuric acid
sulfur oxide
spend vanadium catalysts
leaching
recovery
vanadium
potassium
copper
zinc
arsenic
lead
Opis:: A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.
Źródło:: Polish Journal of Chemical Technology; 2012, 14, 2; 49-53
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Ocena wielkości wymywania jonów K+, Ca2+ i Mg2+ w wybranych drzewostanach w warunkach kwaśnej depozycji
Assessment of K+, Ca2+ and Mg2+ volume leaching in selected tree stands under conditions of acidic deposition
Autorzy:: Kozłowski, R.
Jóźwiak, M.
Jóźwiak, M.A.
Bochenek, W.
Powiązania:: https://bibliotekanauki.pl/articles/1008701.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: lesnictwo
gory
Gory Swietokrzyskie
Beskid Niski
pogorze
drzewostany
sklad gatunkowy
jony wapnia
jony magnezu
jony potasu
wymywanie jonow
depozycja kwasna
zanieczyszczenia powietrza
zanieczyszczenia chemiczne
opady atmosferyczne
odczyn opadow atmosferycznych
acid deposition
forest ecosystems
canopy leaching
throughfall
stemflow
Opis:: The study was conducted in the central part of the Świętokrzyskie Mountains as well as in the Beskid Niski Mountains in the years 2008−2010. Canopy budget model according to Ulrich was used. Paper presents analysis and assessment of the differences between two forest ecosystems under of acidic deposition.
Źródło:: Sylwan; 2012, 156, 08; 607-615
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Leaching of zinc from low grade oxide ore using organic acid
Autorzy:: Irannajad, M.
Meshkini, M.
Azadmehr, A. R.
Powiązania:: https://bibliotekanauki.pl/articles/110892.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: leaching
zinc oxide ore
citric acid
smithsonite
Opis:: The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was investigated. Zinc was extracted successfully from sample by citric acid leaching. The effects of solid-to- liquid ratio, acid concentration, reaction time, temperature and ore particle size on the leaching efficiency were studied. The results obtained showed that particle sizes and reaction time had not any significant effect on the leaching recovery of zinc from smithsonite in the sizes range of 40-350 μm. Under conditions: temperature of 80ºC, reaction time of 60 min, citric acid concentration of 0.5 mol/L, and solid to liquid ratio of 1:10, 82% of zinc could be recovered.
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 2; 547-555
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Production of high quality magnesium chloride from recycled waste magnesite powder
Autorzy:: Erdogan, N.
Yersel, E.
Celebi, C.
Kavakli, N.
Batar, T.
Powiązania:: https://bibliotekanauki.pl/articles/110185.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: waste magnesite powder
leaching hydrochloride acid
magnesium chloride
MgCl2
Opis:: This study investigates the production of high-quality MgCl2 from recycled waste magnesite powder with an average particle size of d50 0.079 mm using the HCl acid leaching method. The experimental parameters were, leaching temperature, leaching time, amount of the acid, liquid-to-solid ratio, scale-up factor, acid concentration, particle size and mixing speed. The experiments were performed under reproducible conditions. The results showed that optimum leaching parameters were: temperature of 70 °C, 180 min leaching time, 130 cm3 acid consumption, 3.6 cm3/g liquid-to-solid ratio, scale-up factor of 1, 10.17 M acid concentration, 0.079 mm average particle size and a mixing speed 60 rpm. Under these optimum conditions, the leaching yield was 96.72%. The produced MgCl2 solution contained 0.04% SiO2, 0.36% CaO, 0% Fe2O3, 0% Al2O3, 46.73% MgCl2, 52.87% L.O.I. and 99.60% MgCl2+L.O.I. (= MgCl2·6H2O). These results indicated that high-quality magnesium chloride can be produced from waste magnesite powder.
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 2; 557-566
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:: Assessing influence of hydrochloric acid leaching on structural changes and bleaching performance of Nigerian clay from Udi
Autorzy:: Ajemba, R. O.
Onukwuli, O. D.
Powiązania:: https://bibliotekanauki.pl/articles/110317.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: acid leaching
adsorption
bleaching
hydrochloric acid
isotherm
Opis:: Clay from Udi in Nigeria was mined, ground, and acid-leached at different concentrations of hydrochloric acid to produce adsorbents of varying properties. The raw and acid-leached samples were characterized using x-ray fluorescence (XRF) and Fourier transforms infra-red spectroscopy (FTIR) to examine the structural modifications in the clay as a result of acid-leaching. The analysis showed that the acid-leaching process caused several modifications of the clay samples. The surface area, Si/[Al + Fe + Mg] ratio, adsorption capacity were found to have increased in the acid-leached samples. The acid-leached samples were tested in order to ascertain their performance in bleaching palm oil and it was observed that the bleaching efficiency increased from 29.8% to 66.7%. The acid-leached sample prepared with 7M hydrochloric acid yielded an adsorbent that was efficient in bleaching palm oil under the experimental conditions. The isotherm analysis showed that the bleaching process followed the Freundlich equation.
Źródło:: Physicochemical Problems of Mineral Processing; 2014, 50, 1; 349-358
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Dissolution and precipitation of zinc and manganese obtained from spent zinc-carbon and alkaline battery powder
Autorzy:: Kursunoglu, S.
Kaya, M.
Powiązania:: https://bibliotekanauki.pl/articles/109337.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: leaching
ascorbic acid
manganese
zinc
precipitation
Opis:: The aim of this study was to investigate manganese and zinc recoveries from spent zinc-carbon and alkaline battery powder. The effect of sulfuric acid concentration, ascorbic acid dosage, reaction temperature and leaching time on zinc and manganese dissolutions was investigated. The optimum reductive acid leaching conditions were determined as: 3 hours, 70 °C, 0.5 M of sulfuric acid concentration, 13 g/dm3 of ascorbic acid dosage, 1/20 g/cm3 of solid/liquid ratio and 200 rpm of stirring speed. Under these conditions, dissolution efficiencies were 99.99% for Zn and 99.25% for Mn. In addition, dissolution kinetics of manganese was undertaken, and the activation energy was found to be 7.04 kJ/mol. Using 3 M NaOH as precipitating agent at room temperature, 95.35% of Zn (at pH 8) and 93.66% of Mn (at pH 10) were precipitated from the leaching solution. Under the same conditions, using 3 M KOH, precipitations of Zn and Mn were 91.63% and 96.39%, respectively. Based on the experimental results, a flowsheet of zinc and manganese recovery was proposed.
Źródło:: Physicochemical Problems of Mineral Processing; 2014, 50, 1; 41-55
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Removal of vanadium, potassium and iron from spent vanadium catalyst by leaching with citric acid at atmospheric pressure
Autorzy:: Mazurek, K.
Powiązania:: https://bibliotekanauki.pl/articles/778659.pdf
Data publikacji:: 2014
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: citric acid
sulphur oxide
spent vanadium catalysts
leaching
recovery
Opis:: The effect of time, temperature, the catalyst particle size and the ratio of the catalyst weight to the leaching solution volume (S:L) on the treatment of spent vanadium catalyst components was determined using citric acid solutions at atmospheric pressure. The optimal parameters of catalyst leaching in 10% acid solutions at atmospheric pressure are: T = 323 K, t = 4 h, the particle size of less than 0.160 mm, the S:L ratio below 0.1. Under these conditions it was possible to dissolve about 90% of vanadium and potassium compounds and more than 60% of iron compounds contained in the catalyst. These results fall within the scope of research on a comprehensive method for recovering spent vanadium catalyst components.
Źródło:: Polish Journal of Chemical Technology; 2014, 16, 1; 59-62
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Investigation of kinetics and mechanism of priceite leaching in sulphuric acid solutions
Autorzy:: Gur, A.
Powiązania:: https://bibliotekanauki.pl/articles/110631.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: boron minerals
priceite
sulphuric acid
leaching kinetics
boric acid
Opis:: The leaching kinetics and mechanism of priceite having the formula of 4CaO5B2O37H2O was investigated in sulphuric acid solutions. For the dissolution process, the effects of reaction temperature, sulphuric acid solution concentration, solid/liquid ratio, particle size, and stirring speed were investigated as effective parameters for the experiments. The experimental data indicated that the dissolution rate increased with the increasing reaction temperature, the decreasing particle size, and the solid/liquid ratio. The conversion rate increased up to 1.0 mol/dm3 with the increasing acid concentration, and then decreased with the increasing acid concentration over concentrations of 1 mol/dm3. It was also determined that the stirring speed had no significant effect on the dissolution rate. The dissolution process of priceite in sulphuric acid solution was tested with regard to heterogeneous and homogeneous reaction models, and it was found that the dissolution rate was controlled by first order pseudo-homogeneous reaction model. The activation energy of the dissolution process was determined as 26.07 kJmol-1. The results were evaluated graphically and statistically. The experimental data were found to fit well with the mathematical model.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 2; 719-730
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Recovery of cobalt and nickel by atmospheric leaching of flotation sulfide concentrate from lubin concentrator
Autorzy:: Gibas, K.
Borowski, K.
Chmielewski, T.
Wejman, K.
Powiązania:: https://bibliotekanauki.pl/articles/951849.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: atmospheric leaching
cobalt
nickel
sulphuric acid
Lubin copper concentrate
Opis:: An experimental study on leaching of cobalt and nickel from a Lubin (Poland) sulfide flotation copper concentrate with oxygenated sulphuric acid solution in the presence of iron(III) sulfate is presented. The effect of temperature, iron(III) concentration, initial sulphuric acid concentration, oxygen flow rate and chloride ions addition on cobalt and nickel leaching were examined. The obtained results show, that enhancing investigated leaching parameters increases both the rate and leaching recovery of nickel and cobalt. The effect of iron(III) ions concentration is particularly significant. Additionally, a significant correlation between copper and nickel/cobalt leaching recovery was observed. Due to the fine dissemination of nickel and cobalt, they were leached remarkably faster when copper leaching recovery exceeded 90%.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 1; 191-203
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Recovery of copper from copper slag and copper slag flotation tailings by oxidative leaching
Autorzy:: Urosevic, D. M.
Dimitrijevic, M. D.
Jankovic, Z. D.
Antic, D. V.
Powiązania:: https://bibliotekanauki.pl/articles/109899.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: copper slag
copper slag flotation tailings
leaching
sulphuric acid
ferric sulphate
hydrogen peroxide
Opis:: Copper smelter slag and copper smelter slag flotation tailings were leached using sulphuric acid solutions, without or with the addition of either ferric sulphate or hydrogen peroxide. Copper extraction from the slag was typically found to be twice as high as that from the slag flotation tailings. Hydrogen peroxide was determined to be the best lixiviant. Thus, copper and iron extractions were 63.4% and 48.6%, respectively, when leaching the slag with 3 M H2O2, after 120 minutes of reaction at room temperature. Copper dissolution was generally found to be the dominant process within the first 60 minutes of reaction, whereas iron dissolution dominated afterwards.
Źródło:: Physicochemical Problems of Mineral Processing; 2015, 51, 1; 73-82
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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