Thermo-activation process

Details Thermo-activation process Thermo-activation process

C - Chemistry, Metallurgy

22

B

53/368

C22B 5/02 (2006.01) C22B 1/02 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1095264

ABSTRACT OF THE DISCLOSURE A process for thermal activation of chalcopyrite-pyrite ore concentrates for activation of iron values in both chalcopy- rite and pyrite constituents whereby said iron values can be selectively removed in a subsequent acid leach. Controlled oxidizing conditions are maintained in an oxidizing heating zone for removal of up to about 90% of total sulfur to be removed for conversion of pyrite and chalcopyrite to their acid-leachable forms, measured by a preferable oxidation of 10 to 15% of iron in the concentrate to ferromagnetic oxides, Thereby remaining total sulfur to be removed is removed in a reducing zone with the assistance of a low H2S/(H2+H2S) ratio by scavenging of H2S by said oxides.

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