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高纯钴盐溶液的净化是制备高纯金属钴的关键,钴与镍的深度分离是制备高纯钴盐溶液的核心技术之一。采用HPD-100苯乙烯-二乙烯基苯大孔吸附树脂和P507萃取剂制备的P507萃淋树脂净化硫酸钴溶液,研究了萃淋树脂的萃取容量以及萃取pH值、淋洗pH值、流出体积等因素对镍钴的分离效果的影响。研究表明:在Φ65 mm×700 mm色层柱中采用含55%P507的萃淋树脂,控制萃取pH值3.7,缓冲溶液淋洗pH值2.98的条件下净化硫酸钴溶液,溶液流速为1.0～1.5个色层柱空体积/h,当淋出液体积为色层柱空体积的3倍时收集淋出液,并用pH 1.0的盐酸反萃,得到高纯氯化钴溶液。将该溶液除去夹杂的有机物,浓缩后进行电解,得到高纯钴经GDMS检测20个杂质元素总含量小于10×10-6%。萃取色层法净化后的溶液,满足制备高纯钴的要求。
Purification of high-purity cobalt salt solution is the key to the preparation of high-purity metallic cobalt. The deep separation between cobalt and nickel is one of the core technologies for preparing high-purity cobalt salt solution. The P507 extraction resin prepared by HPD-100 styrene-divinylbenzene macroporous adsorption resin and P507 extractant was used to purify the cobalt sulfate solution. The extraction capacity of extraction resin and the effects of extraction pH, leaching pH, Effect of other factors on the separation of nickel and cobalt. The results showed that the extraction of 55% P507 extractant resin in the column of Φ65 mm × 700 mm and the control of the extraction pH value of 3.7 and the buffer solution elution pH value of 2.98 purify the cobalt sulfate solution at a flow rate of 1.0-1.5 A color layer of column empty volume / h, when the volume of leachate chromatography column empty volume 3 times the collection of leaching solution, and pH 1.0 hydrochloric acid stripping, to obtain high purity cobalt chloride solution. The solution to remove inclusions of organic matter, concentrated after electrolysis, high purity cobalt by GDMS detection of 20 impurity elements total content of less than 10 × 10-6%. Extracted chromatographic purification of the solution to meet the requirements for the preparation of high purity cobalt.