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Electrochemical Characteristics of Natural Mineral Covellite

Open Journal of Metal 2012年第3期2卷 60-67页

作者： mirjana rajcic-vujasinovic Zoran Stevic Sanja Bugarinovic Technical Faculty in Bor University of BelgradeBorSerbia Mining and Metallurgy Institute Zeleni BulevarBorSerbia

Electrochemical characteristics of covellite (CuS) are of importance from flotation and metallurgical point of view, as well as due to its potential application in solid state solar cells and in photocatalytic reactions. Also, the compound CuS appears as an intermediary product or a final product in electrochemical oxidation reactions of chalcocite (Cu2S) which exhibits supercapacitor characteristics. Natural copper mineral covellite has been investigated in inorganic sulfate acid electrolytes, as well as in strong alkaline electrolyte. Physical properties of covellite were characterized by X-ray diffraction (XRD) and the active surface was examined by optical and electron microscopy (EM) before and after oxidation in galvanostatic regime. Different electrochemical methods (galvanostatic, potentiostatic, cyclic voltammetry and electrochemical impedance spectroscopy - EIS) have been used. The capacitance of around 21 Fcm-2 (geometric area), serial resistance of about 90 Ωcm2 and leakage resistance of about 1200 Ωcm2 have been measured in 1 M H2SO4. The addition of cupric ions in sulfate electrolyte leads to the significant increasing of the capacitance, but having the increase of self-discharge as a negative side phenomenon. The capacitance of around 6.7 Fcm-2 (geometric area), serial resistance of about 80 Ωcm2 and leakage resistance of about 380 Ωcm2 have been measured in 6 M KOH.

关键词： Covellite Capacitance Copper Sulfides Electrochemical Characterization Solar Cells

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Copper,zinc,and iron bioleaching from polymetallic sulphide concentrate

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Transactions of Nonferrous Metals Society of China 2014年第11期24卷 3688-3695页

作者： Vesna T.CONIC mirjana M.rajcic vujasinovic Vlastimir K.TRUJIC Vladimir B.CVETKOVSKI Laboratory for Bioleaching and Solvent Extraction Mining and Metallurgy Institute BorBor 19210Serbia Technical Faculty in Bor University of BelgradeBor 19210Serbia

Bioleaching of low-grade complex Cu–Zn–Pb–Fe–Ag–Au sulphide concentrate (of Majdanpek ore body, RTB Bor, Serbia) was carried out in an aerated bioleach reactor in the presence of mesophilic mixed bacterial culture of Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans. A mesophilic acidophiles culture was isolated from the acidic solution of the underground copper mine of Bor, Serbia. The nutrient medium was 9K at pH 1.6. 87% of the particles were <10 µm in size, with a pulp density of 8% (w/v). Bioleaching efficiencies of 89% for zinc, 83% for copper, and 68% for iron can be achieved in the examined conditions. Kinetic analysis shows that the change in leaching corresponds to the Spencer-Topley kinetic model for diffusion-controlled topochemical reactions.

关键词： bioleaching polymetallic sulphide concentrate mesophiles Acidithiobacillus ferrooxidans

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