关键词: 铜镉渣, 置换, 新制海绵镉, 海绵铜

Abstract: The displacement of copper from copper and cadmium sediment by different metallic reducing agents was studied. The result of experiment showed that the displacement of copper by zinc was not the optimum technique, and the displacement of copper by fresh sponge cadmium was better. A new method of displacement of copper using fresh sponge cadmium was presented. The new method has some advantages which reduced the displacement of coexistence ion and prevented the release of poisonous gas effectively. Some important facts which affect reaction were researched, for example, the quantity of metallic reducing agent, the time of reaction and the temperature of reaction etc. The sponge copper was obtained from acid solution of copper and cadmium sediment which contained 2% copper by fresh sponge cadmium and the purity of sponge copper was 95%, the recovery of copper was over 99%.

Key words: copper and cadmium sediment, displacement, fresh sponge cadmium, sponge copper