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目前分离镍钴最主要的方法是溶剂萃取法,但是对于高镍低钴溶液,溶剂萃取法不能取得高效而经济的分离效果。研究采用HZ818苯乙烯二乙烯基苯大孔树脂和P507,Cyanex 272萃取剂自制双萃取剂浸渍树脂,利用萃取剂的协同作用和树脂色层萃取的高分离级数分离硫酸体系中的Ni~(2+)和Co~(2+),考察了树脂的萃取容量、萃取温度、萃取pH值、淋洗温度、淋洗pH值以及淋洗速度等因素对镍钴分离效果的影响。研究表明:在Φ20 mm×200 mm的色层柱中,选用一定浓度的HAc-NaAc作为缓冲体系,控制料液pH值为4.8,以5.0 ml·min~(-1)的进料流速能取得较好的吸附效果;控制温度为28℃,淋洗流速为5.0 ml·min~(-1),用pH为4.0的HAc-NaAc缓冲溶液淋洗Ni~(2+),当淋出体积为200 ml时,改用pH 1.0的硫酸淋洗Co~(2+),并收集淋出液,得到净化的硫酸钴溶液。
Currently, the most important method for separating nickel and cobalt is solvent extraction, but the solvent extraction method can not achieve efficient and economical separation for high nickel and low cobalt solutions. In this paper, the resin impregnated with HZ818 styrene divinylbenzene macroporous resin and P507 and Cyanex 272 extractants was used to separate resin from the solution of sulfuric acid with high separation grade The effects of extraction capacity, extraction temperature, extraction pH, rinse temperature, rinse pH and rinse rate on the separation of nickel and cobalt were investigated. The results showed that HAc-NaAc with a certain concentration was selected as the buffer system in a column of Φ20 mm × 200 mm, and the pH value of the feed solution was controlled to 4.8. The feed flow rate of 5.0 ml · min -1 was obtained The results showed that Ni (2+) was leached by HAc-NaAc buffer solution with pH 4.0 at a controlled temperature of 28 ℃ and a rinsing flow rate of 5.0 ml · min -1. When the leaching volume was 200 ml, the pH was changed to sulfuric acid leaching Co ~ (2+), and collecting the leachate to obtain purified cobalt sulfate solution.