Biological-acid leach process

Details Biological-acid leach process Biological-acid leach process

C - Chemistry, Metallurgy

12

P

53/18, 53/284

C12P 3/00 (2006.01) C22B 3/18 (2006.01)

Patent

CA 1214043

ABSTRACT OF THE DISCLOSURE A process for leaching copper from copper sulphide containing ore, in particular copper from chalcopyrite containing ore, is provided. The ore is preferably in- itially ground up and mixed with an aqueous acid leaching medium containing sulphide oxidizing bacteria, and a bacte- rial nutrient, and a catalytic amount of silver. Provision is made in the bacterial nutrient for a source of carbon dioxide and oxygen for the bacteria, both of which may be supplied by means of sparging with carbon dioxide enriched air. A bacterial compatible acid is added initially to the ore and leaching medium mixture and periodically during the process so that sulphide in the copper sulphide is oxidized in stoichiometric amounts to elemental sulphur. During leaching the oxidation potential is maintained between about .54 to .66 volts, most readily by initial addition of thio- sulphate and dissolved copper.

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