Abstract

DE BARROS LIMA, RENATA et al. BIOLEACHING OF COPPER SULPHIDE FLOTATION CONCENTRATE IN BATCH REACTION SYSTEM USING MESOPHILE AND THERMOPHILE MICROORGANISMS. Dyna rev.fac.nac.minas [online]. 2012, vol.79, n.172, pp.133-140. ISSN 0012-7353.

This work aims at optimizing the use of consortiaof mesophile and thermophile microorganisms (moderate and extreme ones) in the leaching process of copper sulphidesflotation concentrate, containing approximately 30% bornite (Cu₅FeS₄) and 70% chalcopyrite (CuFeS₂), for extracting copper.The objective of the bioleaching tests was to evaluate the performance of those microorganisms, varying specific parameters such as: the composition of the leaching solution, the presence of an energy source (ferrous sulphate), and the inoculation of cultures . To ensure optimal conditions for the microorganisms to act, the pH, temperature, and stirring speed were controlled. Finally, from the microbial action and using agricultural fertiliser (N:P:K sources), a copper extraction of more than 85% was achieved.

Keywords : Bioleaching; copper; sulphide; chalcopyrite; acidophilic microorganism.

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