Results 141 to 150 of about 1,324 (171)
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Electronic structure and flotation behavior of monoclinic and hexagonal pyrrhotite
Journal of Central South University, 2015Electronic structures of monoclinic and hexagonal pyrrhotite were studied using density functional theory method, together with their flotation behavior. The main contribution of monoclinic pyrrhotite is mainly from Fe 3d, while that of hexagonal pyrrhotite is from Fe 3d, Fe 3p and S 3s.
Cui-hua Zhao, Bo-zeng Wu, Jian-hua Chen
exaly +2 more sources
Selective sulfide precipitation of copper ions from arsenic wastewater using monoclinic pyrrhotite
Science of the Total Environment, 2020Pyrrhotite is a potential source of S2- for the sulfide precipitation of nonferrous metal ions in hydrometallurgy and waste water treatment. In this study, different pyrrhotite crystals were prepared using zero-valent iron and sulfur to determine the effects of the pyrrhotite's structure on the sulfide precipitation of copper ions. The results indicate
Yuehua Hu, Xianping Luo, Tong Yue
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The kinetics of the dissolution of monoclinic pyrrhotite in aqueous acidic solutions
Monatshefte Für Chemie, 1982Using the rotating disc method, the rates of dissolution of natural monoclinic pyrrhotite, FeS1.14, in oxygen-free aqueous solutionsS([H+]=0.1, [Na+]=0.9, [ClO 4 − ]=1.0 mol kg−1) were determined. In the temperature range 40–90 °C the dissolution reaction occurs under kinetic control; the activation ...
Jerzy Bugajski, Heinz Gamsjäger
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Kinetics and thermodynamics of Eu(III) adsorption onto synthetic monoclinic pyrrhotite
Journal of Molecular Liquids, 2016Abstract The adsorption of Eu(III) from aqueous solutions onto monoclinic pyrrhotite (M-Pyr) was studied by batch experiments under various experimental conditions. M-Pyr was synthesized and characterized by XRD, FT-IR, SEM and potentiometric titration.
Tianhu Chen
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International Journal of Minerals, Metallurgy and Materials, 2018
The flotation separation of chalcopyrite from monoclinic pyrrhotite using food-grade guar gum (FGG) as a depressant was studied through flotation tests, kinetic studies, dynamic potential measurements, adsorption experiments, and infrared spectral analyses.
Xiong Chen +3 more
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The flotation separation of chalcopyrite from monoclinic pyrrhotite using food-grade guar gum (FGG) as a depressant was studied through flotation tests, kinetic studies, dynamic potential measurements, adsorption experiments, and infrared spectral analyses.
Xiong Chen +3 more
exaly +2 more sources
American Mineralogist, 2014
An equilibrium mixture of monoclinic pyrrhotite and pyrite was synthesized in the eutectic AlCl3-KCl melt at 525 K. The reaction 7FeS2(cr) + 12Ag(cr) = 8Fe0.875S(cr) + 6Ag2S(cr) was studied by an electromotive force technique in an all-solid-state electrochemical cell with an Ag+-conductive solid electrolyte in Ar at atmospheric pressure: (−) Pt | Ag |
Dmitriy A Chareev +2 more
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An equilibrium mixture of monoclinic pyrrhotite and pyrite was synthesized in the eutectic AlCl3-KCl melt at 525 K. The reaction 7FeS2(cr) + 12Ag(cr) = 8Fe0.875S(cr) + 6Ag2S(cr) was studied by an electromotive force technique in an all-solid-state electrochemical cell with an Ag+-conductive solid electrolyte in Ar at atmospheric pressure: (−) Pt | Ag |
Dmitriy A Chareev +2 more
exaly +2 more sources
A comparative study of the dissolution of hexagonal and monoclinic pyrrhotites in cyanide solution
Hydrometallurgy, 2000Abstract The extent and rate of dissolution of two natural pyrrhotite samples, one monoclinic (Fe 0.88 S) and the other hexagonal (Fe 0.90 S), were studied in alkaline cyanide solutions (pH 10). The effects of dissolved oxygen, particle size, and temperature were investigated.
M.N Lehmann +3 more
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Chemischer Informationsdienst, 1983
AbstractWie Messungen der Auflösungsgeschwindigkeiten des natürlichen Pyrrhotin (FeS1.14) in O2‐freien Lösungen ([H+] = 0.1, [Na+] = 0.9, [ClO4‐] = 1.0 mol kg‐1) mit Hilfe der Methode der rotierenden Scheibe zeigen, erfolgt die Auflösung kinetisch kontrolliert.
J. BUGAJSKI, H. + GAMSJAEGER
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AbstractWie Messungen der Auflösungsgeschwindigkeiten des natürlichen Pyrrhotin (FeS1.14) in O2‐freien Lösungen ([H+] = 0.1, [Na+] = 0.9, [ClO4‐] = 1.0 mol kg‐1) mit Hilfe der Methode der rotierenden Scheibe zeigen, erfolgt die Auflösung kinetisch kontrolliert.
J. BUGAJSKI, H. + GAMSJAEGER
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Intergrowths of hexagonal and monoclinic pyrrhotites in some sulphide ores from norway
Mineralogical Magazine, 1996AbstractPyrrhotites in polished sections from more than twenty stratabound massive sulphide and magmatic nickel-copper deposits in Norway were studied under the microscope using the magnetic colloid method. In both types of deposits, two distinct styles of intergrowths between monoclinic and hexagonal pyrrhotites were found: crystallographically ...
Gu Lianxing, Frank M. Vokes
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