Separation and Recovery of Copper and Arsenic from Black Copper Slime by Oxidation Leaching Method
The comprehensive recovery of copper and arsenic from black copper slime by oxidation leaching method was studied.The effects of acidity,hydrogen peroxide content,temperature,leaching time and liquid volume to solid mass ratio on the leaching rate of copper and arsenic were investigated.The results show that under the conditions of acidity of 200 g/L,hydrogen peroxide content of 30％,temperature of 80 ℃,leaching time of 2.0 h,liquid volume to solid mass ratio of 9∶1,the leaching rates of copper and arsenic can reach 99.53％ and 98.24％,respectively.After oxidative acid leaching,sodium hydrosulfide is added into the solution at the rate of n(NaHS)/n(Cu)=1.1 to precipitate copper.The mass concentration of copper in the solution after copper and arsenic separation is lower than 0.01 g/L,and the mass concentration of arsenic is greater than 40 g/L.The copper and arsenic are effectively separated.Arsenic-rich liquid can be reduced with sulfur dioxide,and arsenic trioxide and reduced liquid can be returned to the oxidation leaching process.
black copper slimeoxidation leachinghydrogen peroxidesodium hydrosulfidecopperarsenicseparationcomprehensive recovery
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维普
