废旧三元锂电池中锰钴的镍皂化萃取分离工艺研究OA

The selective separation of manganese and cobalt from the leaching solution of spent ternary lithium batteries by nickel saponification extraction was studied.The effects of extraction agent concentration,pH,phase ratio,saponification rate,and acid concentration on the extraction and stripping performance were systematically investigated.The results show that after adjusting the pH to 4.8 with Ni(OH)2 and significantly reducing the contents of Fe,Al,and Cu,nickel saponification P204 can achieve efficient extraction of manganese under two-stage cross-flow conditions,with an extraction rate exceeding 99％.Meanwhile,the co-extraction rates of cobalt and lithium are controlled at 18.67％and 9.89％,respectively.After low-acidity washing and sulfuric acid stripping,the stripping rate of manganese reaches 99 96％.Further,nickel saponification P507 is used for two-stage cross-flow extraction of cobalt,achieving a cobalt extraction rate of 99 92％and a co-extraction rate of lithium of 13.68％.After washing and stripping,the stripping rate of cobalt can reach 99.87％.The process significantly reduces the introduction of Na+impurities while achieving efficient separation of manganese and cobalt,leaving nickel and lithium in the system.It provides experimental technical references for the high-purity recovery of multi-metal resources and has potential for further industrial application.