Abstract: The technogen concentrate containing copper sulfide was obtained by alkaline-sulfide leaching of tetrahedrite concentrate with Bi, Sb, and As contamination. The technogen concentrate which contains Cu-33.45%, Fe-14.14%, Ag-0.73%, and S- 23.87% were sulphation roasted under air, and the optimum condition of copper extraction from the roasted product was studied. According to the XRD and SEM-EDS analysis, the roasted residue obtained by the sulphation roasting at lower temperatures contains copper sulfate and associated minerals such as goethite, hematite, and magnetite. The elemental composition of the roas ted product is confirmed as Cu 28.12%, Fe 20.52%, Ag 0.65%, and S 14.34% when analyzed by ICP-OES and chemical analysis. This roasted product containing the copper compounds was easily soluble in water and sulfuric acid. The leaching parameters such as solvent concentration, temperature, leaching time, solid-liquid ratio, and stirring rate were studied systematically. Under the optimized condition of water (25°C, 500 rpm, 1:50, 60 min) and sulfuric acid (1.6 М H2SO4, 25°C, 200 rpm, 1:8, 60 min) leaching, 91.68% and 97.19% copper were recovered in the solution while leaching residue contains 61.47% and 29.18% of iron, respectively. The leaching residue also contains hematite, goethite, maghemite, and albite as revealed in the XRD analysis. The leaching process of copper compounds is found to occur by diffusion both in the water and acid leaching, and activation energy is calculated as 6.05 and 8.70 кJ/mol, respectively. [ABSTRACT FROM AUTHOR]
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