Recovery of copper from arsenical drosses

Details Recovery of copper from arsenical drosses Recovery of copper from arsenical drosses

C - Chemistry, Metallurgy

22

B

53/288

C22B 30/04 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1176062

A B S T R A C T A process for leaching copper and arsenic from copper dross containing copper arsenide and separated from molten lead bullion comprises leaching the dross with an aqueous ammoniacal solution containing arsenate as the predominant anion under oxidizing conditions to obtain a leachate, removing copper from the leachate to obtain a raffinate and re-cycling raffinate to the leaching stage, and removing a bleed of raffinate from the circuit and precipitating a substantially insoluble arsenic compound from the raffinate bleed to remove arsenic from the circuit.

391283

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