C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 11/06 (2006.01) C22B 1/04 (2006.01) C22B 3/10 (2006.01) C22B 3/22 (2006.01)
Patent
CA 2418689
A method for the extraction from a polymetallic sulfide ore of precious metals consisting of gold and silver as well as base metals selected from the group consisting of copper zinc, lead, nickel, cobalt, mercury and tin is disclosed. The method comprises the steps of oxidizing the ore using lean air at temperatures ranging from about 400 to about 600° to produce an oxidized ore and beaching the oxidized ore using a brine solution containing free chlorine, chlorine combined with water, and a catalytic amount of a bromide salt producing a solution of metal chlorides and a barren solid.
Goudreau Gage Dubuc
Lalancette Jean-Marc
Nichromet Extraction Inc.
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