高纯钴制备工艺研究

Preparation Technique of High Purity Cobalt

目前制备99.999%以上金属高纯钴的制备方法很多,主要制备工艺有萃取法,膜分离法,离子交换法,电解法,区域熔炼法等方法。但单一的提纯方法很难达到99.999%以上高纯钴。研究络合-P507萃取工艺与P507萃取工艺分离钴中镍及金属杂质,考察酸度、盐酸、硫酸体系对萃取分离影响。采用20%P507磺化煤油有机相单级萃取提纯钴,钴中Ni%为0.4%,提纯钴中Ni%可达到0.003%~0.004%;不能达99.999%要求,选择1.8%的络合剂Dmege按Co料液中所含Ni的量计算加入,得到络合后的Co溶液。采用同样萃取剂及条件,一次络合萃取分离可使金属钴的Ni%降到≤0.002%;经二次络合萃取分离可使金属钴的Ni%降到0.001%,其他金属杂质含量在检测下限。因此二次络合-萃取-电积工艺,用市售的金属钴料和普通分析纯试剂制备出纯度达99.9999%的高纯金属钴,该工艺采取单级萃取,流程短,操作简单,易控制,Co回收率高,运转费用,生产成本低,易实现工业化生产。为制备高纯金属钴提供简单、合理工艺流程。

There were many methods for preparing cobalt metal of 99.999% purity,such as extraction,membrane separation,ion exchange,electrolysis,zone melting etc.But a single purification method was more difficult to achieve high purity cobalt.With 20% P507 sulfonated kerosene organic phase single-stage extraction purification of cobalt,the content of Ni in cobalt was 0.4%.After purification,the content of Ni in cobalt was 0.003%~0.004%.This method could not meet the requirement of 99.999% purity.Complexing agent Dmeg...