Process for selective extraction of contaminant elements...

Details Process for selective extraction of contaminant elements... Process for selective extraction of contaminant elements...

C - Chemistry, Metallurgy

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B

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C22B 3/26 (2006.01) C01G 28/00 (2006.01) C01G 29/00 (2006.01) C01G 30/00 (2006.01) C01G 49/00 (2006.01) C22B 3/28 (2006.01) C22B 3/32 (2006.01) C22B 3/38 (2006.01) C22B 3/44 (2006.01) C25C 7/06 (2006.01)

Patent

CA 2001564

Abstract of the Disclosure Prior art processes for removal of one or more contaminant elements, including at least one of antimony, bismuth, and arsenic and optionally including iron, from electrolyte solutions of primary metals by solvent extraction with an organic phase including a hydroxamic acid, then precipitating at least part of the contaminant elements from the organic phase as sulfides, are improved by an additional step of re-extracting the organic phase with water before precipitating the sulfides from it. At least part of any arsenic present and, if desired, part of any antimony as well, may be re-extracted in this manner and subsequently recovered if desired, so that the overall process is made more economical.

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