Electrolytically refining silver with complexing of copper ions

Details Electrolytically refining silver with complexing of copper ions Electrolytically refining silver with complexing of copper ions

C - Chemistry, Metallurgy

25

C

204/70

C25C 1/20 (2006.01)

Patent

CA 1040133

ABSTRACT OF THE DISCLOSURE In the electrolytic refining of silver that contains a significant amount of copper, the electrolyte is withdrawn from the refining cell, preferably continuously but alternatively at intervals, and is contacted with an immiscible liquid phase containing a selective complexing agent for cupric ions. The liquid phase carries away at least some copper from the electrolyte without the need to remove the silver first. The treated electrolyte, depleted of copper, is re-usable and is normally returned to the cell. In a continuous-withdrawal system a steady copper level can be maintained in the electrolyte. The complexing-agent phase can be regenerated and copper recovered from it.

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