关键词: 铜镉渣, 酸浸, 铜, 锌, 镉

Abstract: The valuable metals of Cu and Cd were extracted from copper/cadmium residue by taking advantaging of their large difference of redox potential with Zn.Results showed that，the copper sponge of a higher quality was separated firstly under the conditions，such as extraction temperature of 50 ℃，H2SO4 mass fraction of 17 %，and liquid-solid mass ratio（mL/g） of 4∶1.A two-stage process was used in the reduction of Cd.In the first stage，Zn powder was added continuously for about 20 min and it adding amount was controlled at 90% of theoretical amount；In the second stage，99.6% of Cd was removed from the solution while the Zn adding amount was 1.2～1.3 times of the theoretical amount.The solution of ZnSO4 after removing of Co and Cd could meet the requirement of electrolytic Zn process.

Key words: copper/cadmium residue, acid leaching, copper, zinc, cadmium