膜电解法回收电解废渣中金属镍的实验研究

Study on the Recovery of Nickel in the Electrolytic Waste by Membrane Electrolysis

电解废渣中金属镍含量较高,对环境有严重的污染,又具有一定的回收价值.在常规电解方法的基础上,实验采用酸溶及化学沉淀法将其转化为酸性含镍废水后进行单阳膜二极室电解.结果表明：电解温度为25℃,电解电压为6V,电解电流为350mA,电解时间为24h,pH值为4-4.5,此条件下,金属镍离子的回收率及电流效率均可达到90%以上,不仅解决了电解废渣大量堆放污染环境的问题,更是回收了电解废渣中的金属镍,变废为宝,具有一定的经济和环保意义.

The high content of nickel in electrolytic waste has serious pollution to the environment but it can be recycled and made use of.On the basis of the conventional electrolysis,the electrolytic waste is transformed into acidic wastewater containing only nickel by acid dissolution and chemical precipitation,then the wastewater can be electrolyzed by single positive membrane with two rooms.The results show that both recovery and current efficiency of metal nickel ion can reach more than 90%,and the purity of nickel recovery is very high under the condition of electrolysis temperature（25 ℃）,electrolytic voltage（6v）,electrolytic current（350mA）,electrolysis time（24h）and pH（4-4.5）.