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为了处理含高铅的镍物料,进行了电解阳极液中深度除铅的实验研究.分析了电解镍含铅量与电解液中Pb2+质量浓度的关系、共沉淀净化除铅的机理及电解液中的Cl-、Fe3+对除铅结果的影响.通过实验研究,确定了采用共沉淀法深度除铅的最优技术参数:氯化钡加入系数为150、除铅温度为55℃、搅拌除铅时间为60 min、喷淋加入氯化钡溶液的时间为21 min、絮凝剂的质量浓度为2.5 g.L-1.实验结果表明:采用氯化钡共沉淀法净化除铅,除铅后电解液中[Pb2+]≤0.0003 g.L-1,渣含镍质量分数小于4%,满足电解镍生产对电解液成分的要求.通过除铅扩大试验,证明了小型试验所确定的技术参数的可靠性,该工艺成功地应用于工业生产实践.
In order to deal with high-lead nickel material, the experimental study of deep removal of lead from electrolytic anolyte was carried out.The relationship between lead content of electrolytic nickel and Pb2 + concentration in electrolyte was analyzed, the mechanism of coprecipitation to purify Pb The effect of Cl- and Fe3 + on the lead removal was studied.The optimum technical parameters of removing Pb by coprecipitation method were determined through experiments: the adding coefficient of barium chloride is 150, the lead removal temperature is 55 ℃, For 60 min, spray time of adding barium chloride solution was 21 min, the mass concentration of flocculant was 2.5 gL-1. The experimental results show that: using barium chloride coprecipitation method to purify lead, Pb2 +] ≤0.0003 gL-1, the content of nickel in the slag is less than 4%, which meets the requirements of electrolyte composition for electrolytic nickel production.The reliability of the technical parameters determined by the small-scale test is proved by the lead- Applied to industrial production practices.