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Copper from Copper Smelting Slag by Oxidation Leaching

In this paper, copper was recovered from copper smelting slag by oxidation-ammonia leaching under normal pressure. Ammonia persulfate was employed as oxidizing agent and ammonia as complexing. The results showed that the optimal parameters were as following: the mass ratio of liquid and solid was 4:1, the temperature was 35°C, the leaching time was 180 minutes, the amount of (NH4)2S2O8 was 0.4 times of the slag sample, the ammonia concentration was 11mol/L. Under the optimal conditions, recovery of copper was 81.7%.