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recovery method for valuable metals in copper anode slime

     

Sulfuric roasting-hydrometallurgical process
Cu slag leaching: The first leaching removes copper and arsenic; the second leaching removes bismuth and tin.
Copper separation: Copper solutions are settled with silver and recovered of coltan.
Gold separation: Since the recovery of coltan is canceled, gold is separated from the gold solution in stages along with palladium and platinum.
Silver separation: Sodium sulfide and ammonia (ammonia gas) are used for silver separation.

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