Oxidation of metal sulfides using thermotolerant bacteria

C - Chemistry – Metallurgy – 22 – B

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C22B 3/18 (2006.01) C12S 99/00 (2010.01) C12S 13/00 (2006.01)

Patent

CA 2132440

A process for recovering precious or base metals from particulate refractory sulfide materials comprises: a) contacting the sulfide material with an aqueous solution containing a thermotolerant bacteria culture capable of promoting ~ dation of the sul- fide material at a temperature in the range from 25 to 55°C, b) separating the oxidized residue from the aqueous liquid, and, c) treating the oxidized residue and/or the aqueous liquid to recover metal. In this context, a thermotolerant bacterium is one which has an optimum growth temperature of 40 to 45°C, and an operating temperature of 25 to 55°C.

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