柠檬酸浸出废旧锂离子电池中的镍钴锰

Citric Acid Leaching of Nickel,Cobalt and Manganese from Spent Lithium-Ion Batteries

采用柠檬酸+过氧化氢浸出体系从废旧三元锂离子电池正极材料中回收镍、钴、锰,分析了浸出过程中可能发生的反应,分别考察了柠檬酸浓度、过氧化氢质量分数、浸出温度、浸出时间、液固比等因素对正极材料中镍、钴、锰浸出率的影响。在柠檬酸浓度1.5 mol/L、过氧化氢质量分数8%、浸出温度80℃、浸出时间60 min及液固比25 mL/g条件下,金属镍、钴、锰浸出率分别为97.58%、97.35%、96.12%。以乙醇为溶析剂,采用溶析结晶法从浸出液中回收金属,镍、钴、锰结晶率分别为92.34%、93.07%、99.69%。

Nickel,Cobalt and Manganese in the cathode materials of spent ternary lithium-ion batteries were recovered by leaching with a combination of citric acid and hydrogen peroxide.The possible reactions during the leaching process were analyzed,and the effects of factors,including citric acid concentration,mass fraction of hydrogen peroxide,leaching temperature,leaching time and liquid-to-solid ratio on the leaching rates of nickel,cobalt and manganese from cathode materials were also investigated.It is found that after 60 min leaching at 80℃with citric acid at a concentration of 1.5 mol/L,hydrogen peroxide at a mass fraction of 8%,and a liquid-to-solid ratio of 25 mL/g,the leaching rates of nickel,cobalt and manganese are 97.58%,97.35%and 96.12%,respectively.Then,an antisolvent crystallization method is adopted with ethanol as antisolvent agent to recover metals from the obtained leach liquor,leading to the crystallization rates of nickel,cobalt and manganese at 92.34%,93.07%and 99.69%,respectively.