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.
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