Ammonia leaching

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C - Chemistry, Metallurgy

25

C

204/69.5

C25C 1/08 (2006.01) C22B 15/00 (2006.01) C25C 1/12 (2006.01)

Patent

CA 1153984

AMMONIA LEACHING Abstract-of the Disclosure An improved process for obtaining copper from a copper sulfide, in which: the copper sulfide is treated with oxygen and an aqueous leaching solution of ammonium carbonate, to form a leach liquor which contains ammonia complexes of copper sulfate and copper carbonate; the leach liquor is heated to form gaseous ammonia and carbon dioxide; the leach liquor is treated with a strongly alkaline material to precipitate sulfates and form additional gaseous ammonia; and the copper is then recovered by electrowinning. In this process, the ammonium carbonate leaching solution is formed from carbon dioxide that is generated by: adding a metal carbonate to the leach liquor during the heating thereof; and recovering the gaseous carbon dioxide, as well as the gaseous ammonia, formed during the heating of the leach liquor.

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