Recovery of Elemental Arsenic from Copper Anode Slime by Chlorination Leaching Method
The recovery of As from copper anode slime by chlorination leaching-NaH2 PO2 selective reduction process was studied.The effects of liquid volume to solid mass ratio,initial acidity,leaching temperature,initial Cl-mass concentration and leaching time on the leaching rate of As.The effects of reduction temperature,molar ratio of NaH2PO2 to As and reduction time on the precipitation rate of As were investigated.The results show that the optimum chlorination leaching conditions are initial acidity of 220 g/L,liquid volume to solid mass ratio of 6/1,leaching temperature of 70 ℃,initial Cl-mass concentration of 150 g/L and leaching time of 2.5 h.The optimum reduction conditions are reduction temperature of 80 ℃,molar ratio of NaH2PO2 to As of 2/1,reduction time of 2 h.Under the optimal conditions the average mass fraction of As is 90.44％,and the product quality can meet the refining requirements of elemental arsenic.
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维普
