废旧磷酸铁锂正极粉回收制备电池级碳酸锂工艺研究  

Study on the process of battery lithium carbonate from waste lithium iron phosphate anode powder

作　　者：周有池 文小强[1] 刘雯雯[1] 郭春平[1] ZHOU You-chi;WEN Xiao-qiang;LIU Wen-wen;GUO Chun-ping(Ganzhou Nonferrous Metallurgy Research Institute, Ganzhou 341000, China)

机构地区：[1]赣州有色冶金研究所,江西赣州341000

出　　处：《世界有色金属》2018年第23期176-179,共4页World Nonferrous Metals

基　　金：江钨控股集团科研项目(JW-17B-19);江钨控股集团科研项目(JW-18B-13)

摘　　要：采用部分盐酸+氧化剂体系选择性回收废旧磷酸铁锂正极材料粉中的锂,研究了氧化剂的选择、氧化剂用量、酸耗量、液固比以及反应时间对锂浸出率的影响。浸出液经除杂后进行沉锂,获得的碳酸锂产品的主含量大于99.6%,达到电池级碳酸锂要求,锂的总回收率达到90%。实验结果发现,酸耗量摩尔比为1.0倍,大幅度降低了回收过程的耗酸耗碱量,且锂液浓度经两次逆流浸出可达24g/L,避免了锂液蒸发浓缩过程,简化了工艺流程。This paper study the effects of oxidant selection, oxidant dosage, acid consumption, liquid-solid ratio and reaction time on the leaching rate of lithium by partial hydrochloric acid plus oxidant system selectively recover lithium from waste lithium iron phosphate anode material powder.The leaching liquid was used to precipitate lithium after removing impurities,it is shown that the obtained lithium carbonate products has reached the battery level requirement,with the main content as high as 99.6%,the total recovery rate of lithium reached 90%.The experimental results showed that the molar ratio of acid consumption was 1.0 times, which greatly reduced the acid consumption and alkali consumption in the recovery process, and the concentration of lithium solution could reach 24g/L after two counter-current leaching, which avoided the evaporation and concentration process of lithium solution and simplified the process flow.

关 键 词：选择性 废旧 磷酸铁锂 回收 碳酸锂 电池级 

分 类 号：TG146.263[一般工业技术—材料科学与工程]