CL-Cyanex272萃取色层法深度净化钴溶液

Deep Purification of Cobalt Solution by Extraction Chromatography Method with CL-Cyanex272

以苯乙烯为单体,二乙烯苯为交联剂,Cyanex272为萃取剂,采用乳液悬浮聚合法制备CL-Cyanex272萃淋树脂。采用静态吸附法探究了Co浓度、温度、pH、皂化度、时间等因素对CL-Cyanex272萃淋树脂吸附Co、Ni、Mg的影响;采用萃取色层法探究了连续动态过程中萃淋树脂对含Co溶液净化的影响。结果表明:当料液pH=6、皂化度为100%时,CL-Cyanex272萃淋树脂对Co的吸附量达21.4 mg g;控制皂化度≥70%、料液pH≥5时,Co与Ni、Co与Mg的分离效果较好,其分离系数分别达到1697和18;动态吸附试验中CL-Cyanex272萃淋树脂可将料液中Co的浓度从80.15%提纯到99.9996%。本研究为CL-Cyanex272萃淋树脂用于工业纯化Co溶液提供良好的依据。

CL-Cyanex272 extraction resin was prepared by emulsion suspension polymerization with styrene as monomer,divinylbenzene as cross-linking agent,and Cyanex272 as extractant.The effects of Co concentration,temperature,pH value,saponification degree and time on the adsorption of Co,Ni and Mg by CL-Cyanex272 were investigated by static adsorption method.The effect of CL-Cyanex272 on purification of Co containing solution in continuous dynamic process was investigated by extractive chromatography method.The results show that the adsorption capacity of Co by CL-Cyanex272 is 21.4 mg g at pH=6 and saponification degree of 100%.Controlling saponification degree of>70%and pH≥5 leads to better separation of Ni and Mg from Co,the separation coefficients reach 1697 and 18,respectively.In the dynamic adsorption test,Co concentration in the feed liquid is purified from 80.15%to 99.9996%by CL-Cyanex272.This study provides a good basis for the industrial purification of Co solution with CL-Cyanex272.