醇-羧酸非水体系浸出钴酸锂中的金属元素  

Leaching Metal Elements from Lithium Cobalt Oxide in an Alcohol-Carboxylic Acid Non-Aqueous System

作　　者：文云鹏 赵碧 何喜红 WEN Yunpeng;ZHAO Bi;HE Xihong(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055

出　　处：《有色金属工程》2023年第10期46-52,60,共8页Nonferrous Metals Engineering

基　　金：陕西省自然科学基础研究计划项目(2021JM-370);西安建筑科技大学自然科学专项(ZR21022)。

摘　　要：利用非水体系浸出废旧锂离子电池正极材料得到了广泛关注。分别采用丙三醇-甲酸二元非水体系和丙三醇-甲酸-氯化胆碱三元非水体系浸出LiCoO_(2)正极材料。研究了浸出时间、浸出温度、液固比对浸出的影响。结果表明,氯化胆碱的加入能够大幅度提高非水体系对金属的浸出率,在时间200 min、温度120℃、液固比100 mL/g的条件下,三元非水体系对Li和Co的浸出率分别达到了99.77%和89.09%,高于二元非水体系的67.94%和67.11%。为揭示浸出机理,采用紫外-可见光谱和红外光谱对浸出液进行了分析。结果表明,甲酸能够将LiCoO_(2)中的Co^(3+)还原为Co^(2+),但Co^(2+)在两种非水体系中的存在形式不同,Co^(2+)在二元体系以六配位的形式存在,而在三元体系以四配位的形式存在。The leaching of spent lithium-ion battery(LIBs)cathode materials with non-aqueous systems has received widespread attention.In this paper,a binary non-aqueous system of glycerin(Gly)-formic acid(FA)and a ternary non-aqueous system of Gly-FA-choline chloride(ChCl)were used for the leaching of LiCoO_(2)cathode materials.The effects of leaching time,leaching temperature and liquid-to-solid ratio conditions on leaching rates were investigated.The results indicated that the addition of ChCl was able to significantly improve the leaching rates of the metals.Under the optimal conditions of time 210 min,temperature 120℃and liquid-solid ratio 100 mL/g,the ternary non-aqueous system achieved leaching efficiencies of 99.77%and 89.09%for Li and Co respectively,higher than the 67.94%and 67.11%for the binary non-aqueous system.The leachate was analyzed by UV-Vis and FT-IR spectroscopy to reveal the leaching mechanism.The results showed that FA was able to reduce Co^(3+)to Co^(2+)in LiCoO_(2).However,Co^(2+)was present in different forms in the two non-aqueous systems,where the binary system was present as a hexa-coordination and the ternary system as a tetra-coordination.

关 键 词：非水体系 浸出 钴酸锂 氯化胆碱 浸出机理 

分 类 号：TF803[冶金工程—有色金属冶金] X705[环境科学与工程—环境工程]