纳滤耦合电渗析工艺处理镍电积阳极液研究

Treatment of nickel electrowinning anode solution by nanofiltration coupled with electrodialysis

为降低镍电积生产工艺中的纯碱消耗,采用纳滤-电渗析耦合技术对电积镍阳极液进行酸盐分离并回收稀酸,首先利用特种纳滤膜将阳极液中硫酸镍与硫酸分离,然后利用电渗析技术对分离后产生的稀酸液进行浓缩回用.研究结果表明,在料液温度55℃、运行压力3.5MPa、流量1000L/h的条件下,该纳滤膜可实现镍离子截留率91.36%,氢离子脱除率73.07%,具有较好的酸盐分离效果.电渗析可对分离出的稀酸进行浓缩,最高可使硫酸浓度提高4.3倍,达到33.8g/L.纳滤膜耦合电渗析工艺处理镍电积阳极液工艺无废水排放,具有良好的经济效益和环境效益.

In order to reduce the Na_(2)CO_(3) consumption of nickel electrowinning,the coupling technologies of nanofiltration and electrodialysis were used to separate acid-salt from the anodic solution and recover the dilute acid.The nickel sulfate in the anodic solution was separated from the sulfuric acid by special nanofiltration membrane,followed by the dilute acid being concentrated and reused by electrodialysis.The results showed that under the conditions of feed temperature of 55℃,operating pressure 3.5 MPa and flow rate of 1000 L/h,the retention rate of nickel ion and the removal rate of hydrogen ion were 91.36%and 73.07%,respectively.There was a good separation effect for acid-salt by nanofiltration.Electrodialysis can concentrate the separated dilute acid.A maximum concentration of sulfuric acid was increased by 4.3 times to 33.8 g/L.The anode liquor of nickel electrowinning was treated by nanofiltration coupled with electrodialysis,showing advantages of no waste water discharge and good economic and environmental benefits.