从电镀污泥中回收镍、铜和铬的工艺研究

详细信息

Recycling process of nickel,copper and chromium from the electroplating sludge

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

摘要: 采用硫酸浸出-硫化沉铜-两段中和除铬-碳酸镍富集工艺,从电镀污泥中综合回收铜、铬和镍.考察了各工序过程中的影响因素,获得了最佳工艺条件:酸浸过程中反应时间为0.5 h,反应温度为50℃,硫酸加入量为理论量的0.8倍;沉铜过程中,沉铜剂加入量为理论量的1.2倍,反应时间和反应温度分别为1 h和85℃;采用两段除铬工序有效降低了沉淀过程中的镍损失.整个工艺中,铜、铬和镍的回收率分别达到98%、99%和94%以上.
- 电镀 /
- 污泥处理 /
- 金属回收 /
- 铜 /
- 铬 /
- 镍
Abstract: The electroplating sludge was treated for the comprehensive recovery of copper, chromium and nickel with procedures including sulfuric acid leaching, copper precipitation, chromium removal by two-stage neutralization, and nickel carbonate concentrating. Various processing factors were studied and the optimum conditions were obtained as follows:0.5 h, 50℃, and 0. 8 times of stoichiometric sulfuric acid addition for sulfuric acid leaching; 1 h, 85℃, and 1.2 times of stoichiometric copper precipitator addition for copper precipitation; the two-stage chromium removal method decreases nickel loss in the precipitation process. More than 98% of copper, 99% of chromium and 94% of nickel originally contained in the sludge were successfully recovered by using this process.
- electroplating /
- sludge disposal /
- metal recovery /
- copper /
- chromium /
- nickel