转炉渣富钴镍浸出液镍钴分离工艺研究

Process Study on Separation of Nickel and Cobalt in Converter Slag Lixivium

以某厂镍电解生产净化工序氯气除钴产生的钴渣为氧化剂,除去转炉渣浸出液电积脱铜后液中的钴,实现转炉渣富钴镍浸出液中镍钴分离。结果表明,在钴渣含三价镍与钴量摩尔比为4～5,反应温度70～80℃,反应时间120min,终点pH 4.8～5的条件下,分离富集钴后的二次钴渣镍钴比可降为1～1.5,可用于生产钴产品。除钴后液可直接并入镍电解系统。

In order to separate cobalt from cobalt-rich produced from nickel electrolysis purification process nickel leaching solution of converter slag, cobalt slag of cobalt removing with chlorine was applied as oxidizing agent to remove the cobalt from copper removal solution of converter slag lixivium. The results show that mole ratio of nickel and cobalt in secondary cobalt slag is decreased to 1-1.5 under the following con- ditions including original mole ratio of nickel and cobalt in cobalt slag of 4-5, reaction temperature of 70 80 ℃, reaction time of 120 min, and pH value of endpoint of 4. 8℃. The secondary cobalt slag is used as the raw materials of cobalt product, and cobalt removal solution is returned to nickel electrolysis svtern.