预先除杂—多段焙烧强化废旧锂电材料选择性优先提锂  

Pre-removal of Impurities Combined with Multi-stage Roasting toStrengthen Selective Extraction of Lithium from Spent Lithium Batteries

作　　者：丁立鑫 刘子孟 姜涛 袁雪 何亚群[2] 张光文 DING Lixin;LIU Zimeng;JIANG Tao;YUAN Xue;HE Yaqun;ZHANG Guangwen(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《有色金属（冶炼部分）》2023年第9期115-121,共7页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金青年基金资助项目(52104273);江苏省自然科学基金青年基金资助项目(BK20200645);江苏省研究生科研与实践创新计划项目(SJCX_1318);中国矿业大学研究生创新计划项目(2023WLJCRCZL245)。

摘　　要：以废旧三元锂电混合电极材料为原料,通过预处理除杂和多段焙烧,实现高效选择性优先提锂。采用单因素试验确定了碳热还原的最优工艺条件:焙烧温度700℃、焙烧时间120 min。在最优热处理条件下,通过热解—水力搅拌—筛分—碱浸脱除有机质和铝箔,锂回收率从85.22%提高至92.70%;通过二段焙烧水浸,锂回收率可进一步提升至94.16%。Through the combination of pre-removal of impurities and multi-stage roasting,the efficient selective lithium extraction from spent ternary lithium-ion batteries can be realized.The optimum process conditions for carbon thermal reduction were determined by single factor experiments:roasting temperature of 700℃and roasting time of 120 minutes.Under the optimal conditions of reduction roasting,the recovery rate of lithium rises from 85.22%to 92.70%after the removal of organic matter and aluminum foil by pyrolysis,hydraulic stirring,screening,and alkali leaching.Furthermore,the lithium recovery rate can be up to 94.16%by two-stage roasting combined with water leaching.

关 键 词：废旧锂电材料 还原焙烧 预先除杂 多段焙烧 

分 类 号：TF803.2[冶金工程—有色金属冶金]