Process for the extraction of precious metals for...

Details Process for the extraction of precious metals for... Process for the extraction of precious metals for...

C - Chemistry, Metallurgy

22

B

53/168, 53/225

C22B 3/38 (2006.01) C01G 7/00 (2006.01) C01G 55/00 (2006.01) C22B 3/26 (2006.01) C22B 3/32 (2006.01) C22B 3/34 (2006.01)

Patent

CA 1178063

ABSTRACT OF THE DISCLOSURE The process comprises the steps of leaching the concentrate with hot hydrochloric acid and chlorine gas to dissolve most of the gold, platinum and palladium, treating the residue from the leaching step with an excess of an alkaline oxidising agent to solubles the ruthenium, slurrying the resulting solids in water, com- bining the precious metal values from the slurry with the liquor from the leaching step and releaching the resulting slurry with hot hydrochloric acid and chlorine. The leach liquor which is then separated from the remaining solids is a chloride solution which contains substantially all the platinum group metals and gold present in the concentrate.

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