This paper uses the lime milk precipitation-iron powder replacement method to recover sponge copper from chlorinated solution,achieving good results.The test results show that when the concentration of Ca(OH)2 lotion is 20%,the precipitation reaction pH=0,the precipitation time is 3 h,the replacement time is 3 h,and the end point pH=0.42,the purity of sponge copper obtained in the small-scale test is 91.8%,and the concentration of secondary filtrate Cu is 4.13 mg/L;the purity of sponge copper obtained from the intermediate test is 88.2%,and the concentration of Cu in the secondary filtrate is 15.1 mg/L.The results show that the purity of sponge copper in the product exceeds 88%,and almost all Cu is replaced,and the intermediate test indicators are slightly lower than the small-scale test indicators.This process is feasible and meets expectations.
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