C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
53/146
C01G 39/00 (2006.01) C01G 21/16 (2006.01) C22B 34/34 (2006.01)
Patent
CA 1098715
K-0494-KCC ABSTRACT OF THE DISCLOSURE Copper, iron, and lead impurities are removed from molybdenum flotation concentrates by mixing the feed concentrates with a nonvolatile chloride salt, heating the mixture to a temperature of from about 200°C to 350°C for a time sufficient to activate the lead impurities in the concentrates so that they can be leached therefrom during the subsequent leach step, and leaching copper, iron, and lead impurities from the heat-treated concen- trates with a mildly oxidizing leach solution containing chloride ions and having a pH of no more than 4. Prefer- ably, the mixing of the chloride salt and the feed concen- trates is achieved by thoroughly mixing an aqueous solu- tion of the salt with the feed concentrates. It is advan- tageous to use an aqueous ferric chloride solution to leach the heat-treated concentrates inasmuch as the lead values leached from the concentrates are readily crystallized from the pregnant leach solution and the resulting spent solution can be recycled without further treatment to be mixed with the feed concentrates, or it can be treated to oxidize ferrous values therein to ferric and then recycled for repeated use as regenerated leach solution.
293574
Kennecott Copper Corporation
Kirby Eades Gale Baker
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