从铜镉渣中回收铜

对不同的金属还原剂从铜镉渣中置换铜进行了研究，提出了用新制海绵镉置换铜的新方法，减少了共存离子的置换，有效地防止了有毒气体的生成. 用含铜2%的铜镉渣制得了纯度高达95%的海绵铜，铜的回收率达到99%以上.

Recovery of Copper from Copper and Cadmium Sediment

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%.