Separation and Recovery Process of Tin,Zinc,and Cadmium from Tin Smelting Dust
The sparation and recovery of tin,zinc and cadmium from tin smelting dust by sulfuric acid leaching-removing arsenic with oxidation hydrolysis-replacing cadmium with zinc powder were studied.And the effects of various factors on the sparation and recovery were investigated.The results show that the leaching rates of Zn and Cd are 93.25％and 89.35％,respectively,and the leaching rates of Sn are less than 0.1％under the conditions of initial sulfuric acid concentration of 15％,liquid volume to solid mass ratio of 3:1,leaching time of 120 min and leaching temperature of 90 ℃.When the amount of hydrogen peroxide is 2％and the control end point pH is 5,the mass concentration of As in the leaching solution can decrease to 0.1 mg/L after arsenic removal.Under the conditions of reaction temperature of 60 ℃,dosage of zinc powder 1.0 times of the theoretical amount,stirring speed of 250 r/min and reaction time of 30 min,sponge cadmium with cadmium content above 95％is obtained.The process can realize efficient recovery and utilization of valuable metals in tin smelting dust.
tin smelting dustvaluable metalrecoveryleachingtinzinccadmiumseparation
万方数据
维普
