Abstract: The effect of copper ion, Cu2+, on deep deletion of cobalt from zinc sulfate solution was studied comprehensively by several criteria, including the time when cobalt concentration reaches 0.1 mg/L, the time of duration when cobalt concentration is below 0.1 mg/L and the initial concentration of copper ion guaranteeing deep removal of cobalt. The best results are respectively obtained under the optimal conditions of addition of [Cu2+]0 200 mg/L, mass ratio of Co and Sb (Co/Sb) at 2:1, at 25 min [Co2+] dropped to 0.1 mg/L and lasting 70 min for the solution with [Co2+]0=15 mg/L, and addition of [Cu2+]0 100 mg/L, Co/Sb=2:1, at 40 min [Co2+] dropped to 0.1 mg/L and lasting 55 min for [Co2+]0 of 7.5 mg/L. The agitation speed has little effect on cobalt removal and even promotes redissolution. The analysis results by energy spectrum indicate that the cobalt redissolution is probably due to the dissolution of basic cobalt salt.

Key words: zinc sulfate solution, cobalt removal, copper ion, deep purification

摘要： 对Cu2+在湿法炼锌浸出液锑盐法深度净化除钴过程中的作用进行了研究. 考察了钴离子浓度达到深度净化浓度([Co2+]<0.1 mg/L)的时间、低于该浓度的持续时间及所需初始铜离子浓度([Cu2+]0)等因素，综合衡量除钴效果，得到优化实验条件为：[Co2+]0=15 mg/L时，钴/锑质量比(Co/Sb)=2:1，[Cu2+]0=200 mg/L，达到深度净化浓度的时间和保持该浓度的时间分别是25和70 min；[Co2+]0=7.5 mg/L时，Co/Sb=2:1，[Cu2+]0=100 mg/L，达到和保持深度净化浓度的时间分别是40和55 min. 搅拌转速对除钴效果影响不大，高转速有利于钴返溶，返溶的原因可能是沉积的碱式钴盐溶解.

关键词: 硫酸锌电解液, 除钴, Cu2+, 深度净化