化工矿物与加工2025，Vol.54Issue(8)：33-39,7.DOI:10.16283/j.cnki.hgkwyjg.2025.08.004
废磷酸铁锂电池黑粉湿法浸出回收工艺研究
Study on wet leaching and recovery process of black powder from waste lithium iron phosphate batteries
刘海洋 1刘卓齐 1何昕阳 1彭锦秀 1王建波1
作者信息
- 1. 西南科技大学 环境与资源学院,四川 绵阳 621000||固体废物处理与资源化教育部重点实验室,四川 绵阳 621000||四川省非金属矿粉体改性与高质化利用技术工程实验室,四川 绵阳 621000
- 折叠
摘要
Abstract
The lithium content in waste lithium iron phosphate battery is high,which is a valuable secondary resource.In this paper,lithium was selectively extracted from waste lithium iron phosphate black powder with hydro-chloric acid(HCl)as leaching agent and sodium chlorate(NaClO3)as oxidant.The redox potential Eh and pH of the solution during the leaching process are important parameters to ensure the priority of lithium extraction.The thermo-dynamic analysis of the leaching process was carried out by HSC Chemistry 6.0 software and Hydra-Medusa software.The optimum conditions for the leaching of LiFePO4 in the hydrochloric acid-sodium chlorate system are that the redox potential is greater than 435 mV and pH value is 1.8～2.15.The effects of hydrochloric acid concentration,sodium chlorate concentration,leaching time,solid-liquid ratio and temperature on the leaching rate of lithium and iron were investigated by single factor experiments.The results show that under the optimum leaching conditions of hydro-chloric acid concentration 1.96 mol/L,sodium chlorate concentration 0.26 mol/L,solid-liquid ratio 1∶3,leaching time 2.5 h and leaching temperature 85℃,the average leaching rate of lithium is as high as 99.43%and the average leaching rate of iron is 13.45%after three repeated experiments.关键词
磷酸铁锂/湿法回收/优先提锂/氧化还原电位/浸出率/单因素实验Key words
lithium iron phosphate/wet recovery/priority extraction of lithium/oxidation-reduction potential/lea-ching rate/single factor experiment分类
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刘海洋,刘卓齐,何昕阳,彭锦秀,王建波..废磷酸铁锂电池黑粉湿法浸出回收工艺研究[J].化工矿物与加工,2025,54(8):33-39,7.
