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对硫酸镍电解液的萃取净化除杂进行了系统的研究。实验采用M5640对铜离子进行除杂,实验条件为:pH值为3.0,相比为1∶1,萃取剂体积浓度为15%,振荡时间5min,在此实验条件下铜离子的萃取率大于99.83%,其含量小于0.1mg·mL-1,已达到5N镍电解液标准。去除铜离子之后,采用P507对电解液进行除杂,在实验条件pH为4.0,相比为1∶1,萃取剂体积浓度为15%,振荡时间5min下,二价铁离子、锌离子、铅离子的萃取率分别为:99.93%,99.75%,84.01%,其含量分别为:<0.10,0.21,0.30mg·mL-1,已达到5N镍电解液标准。在此之后再采用P507对电解液中钴离子进行去除,实验条件为:用氢氧化钠溶液均相制皂75%,提高待萃液当中钴离子的含量至4.19g.L-1,即Co/Ni为1/10。实验采取四级萃取,控制水相pH值在4～5之间。钴离子萃取率为74.92%,含量为14.88mg·mL-1,已达到5N镍电解液标准。
Sulfate nickel electrolyte extraction and purification impurity removal carried out a systematic study. In the experiment, M5640 was used to purify copper ions. The experimental conditions were as follows: the pH value was 3.0, the ratio of 1: 1, the volume concentration of extractant was 15% and the oscillation time was 5min. Under these experimental conditions, the extraction rate of copper ions was more than 99.83 %, Its content is less than 0.1mg · mL-1, has reached the standard 5N nickel electrolyte. After removal of the copper ions, the electrolyte was subjected to impurity removal using P507 under conditions of pH 4.0, 1: 1 in comparison to 15% by volume of extractant, 5 minutes of shaking time, ferrous ions, zinc ions, lead The extraction rates of ions were 99.93%, 99.75% and 84.01%, respectively. Their contents were: 0.10, 0.21 and 0.30 mg · mL-1, respectively, and reached the standard of 5N nickel electrolyte. After that, P507 was used to remove the cobalt ions in the electrolyte. The experimental conditions were as follows: 75% soap was homogenized with sodium hydroxide solution, and the content of cobalt ions in the solution to be extracted was increased to 4.19gL-1, that is, Co / Ni 1/10. Four levels of extraction experiments to control the water phase pH value between 4 ~ 5. Cobalt ion extraction rate of 74.92%, the content of 14.88mg · mL-1, has reached 5N nickel electrolyte standards.