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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。
Preparation of 99.999% above the current method of preparing a large number of high purity cobalt, the main preparation process extraction, membrane separation, ion exchange, electrolysis, zone melting method. However, a single purification method is difficult to achieve high purity cobalt 99.999%. The complexing-P507 extraction process and P507 extraction process were used to separate nickel and metal impurities in cobalt. The effects of acidity, hydrochloric acid and sulfuric acid on extraction and separation were investigated. The single-stage extraction of 20% P507 sulfonated kerosene was used to purify cobalt. The Ni% in cobalt was 0.4%, and the Ni% in purified cobalt could reach 0.003% ~ 0.004% .It could not reach the requirement of 99.999% and chose 1.8% complexing agent Dmege According to the amount of Co contained in the feed liquid Ni was added to obtain a complexed Co solution. Using the same extractant and conditions, a complex extraction extraction can make the metal cobalt Ni% down to ≤ 0.002%; After secondary complexation extraction can make the metal cobalt Ni% down to 0.001%, other metal impurities in the detection Lower limit. Therefore, the secondary complexing - extraction - electrowinning process, using commercially available metal cobalt material and ordinary analytical reagent to prepare a purity of 99.9999% of high purity cobalt metal, the process to take a single-stage extraction, the process is short, easy to operate, easy Control, Co recovery rate, operating costs, low production costs, easy to achieve industrial production. For the preparation of high purity cobalt metal to provide a simple, reasonable process.