盐析法从锂离子电池正极浸出液中回收钴盐的研究

根据电解质溶液的现代理论,探索利用盐析方法从锂离子电池正极浸出液中回收盐的可能性.在从LiCoO2为正极的盐酸浸出液中加入(NH4)2SO4饱和水溶液和无水乙醇,可使浸出液中的Co2 发生盐析,当浸出液、(NH4)2SO4饱和水溶液和无水乙醇的体积比控制为2:1:3时,Co2 的析出率可达到92%以上.所得盐析产品经X射线衍射分析可知为(NH4)2Co(SO4)2和(NH4)Al(SO4)2,且Co2 在Al3 之前从浸出液中析出,分段盐析可使这2种盐分离,得到不同的产品.

Study on cobaltous recovery from cathode leachate of lithium-ion battery by salting out

Based on the modern theory of electrolyte solutions, the possibility of cobaltous recovery was studied. Saturated ammonia sulfate solution and absolute alcohol were added into the leachate of LiCoO₂ cathode, and then Co²⁺ in the leachate salted out. When the volume ratios of leachate, saturated ammonia sulfate solution and absolute alcohol were 2:1:3, the salting out efficiency of Co²⁺ can be more than 92%. From the figure of X-ray diffraction,ammonium cobalt sulfate hydrate and ammonium aluminum sulfate hydrate were detected in the products, and Co²⁺ salted out before Al³⁺. Therefore Co²⁺ can be separated from Al³⁺ by graded salting out and then reclaimed different productions.