Abstract
Laboratory investigations were performed with tetrahedrite concentrate from Mária—RoŽňava mine in Slovakia having the chemical composition of 21% Cu, 11% Sb, 28% S, 1% As, 2% Zn, 0.2% Ag and 1% Hg. X-ray analysis reveal following proportions of dominating phases: 41% Tetrahedrite (Cu4Sb4S13), 12% Chalcopyrite (CuFeS2) and 25% Pyrite (FeS2). Chemical leaching tests with Na2S-solutions indicate that only half of the antimony in the concentrate can be recovered, whereas mechano-chemical leaching in a stirred ball mill under similar leaching conditions a nearly complete and selective antimony extraction is achieved. According to X-ray analysis the increased extraction by mechano-chemical leaching might be related beside the grinding action to the transformation of tetrahedrite into covelite (CuS), Depending on the degree of disorder in tetrahedrite the chemical and bacterial leaching of the solid residues after mechano-chemical treatment with CS(NH2)2/Fe2(so4)3 solution silver recoveries from 50–90% and with Thiobacillus ferrooxidans-medium copper recovery was 74–84%.
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Baláž, P., Kammel, R., Kušnierová, M., Achimovičová, M. (1994). Mechano-chemical treatment of tetrahedrite as a new non-polluting method of metals recovery. In: Hydrometallurgy ’94. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1214-7_12
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DOI: https://doi.org/10.1007/978-94-011-1214-7_12
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