盐浸-氧化循环工艺高效回收废旧 LiFePO4 正极粉
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中图分类号：TQ465.92 文献标志码：A DOI： 10.3969/j.issn.1003-9015.2026.01.009
文章编号：1003-9015（2026）01-0082-08
Abstract：In order to realizetheefficient and low-cost recycling of spentLFPcathode powder，the spent LFP cathode powder was recovered through the salt leaching-oxidation cycle process. FeCl3 was used as the leaching agent，and the FeCl2 in the leaching solution was oxidized back to FeCl3 using H2O2 ，enabling the regeneration of the leaching agent.Under optimized conditions， the leaching efficiency of Li reached 99.56% in the first leaching cycle and remained at 97.37% after ten cycles. The residue was crude FePO4 .The purer LiCl solution was obtained by adding KOH to precipitate Fe2+ ， Fe3+ ，and Al3+ in the final leaching solution，and the concentration of Li+ was （20 4.80mol⋅L-1 . Economic evaluations of three methods， i.e.， salt leaching-oxidation cycle， selective lithium extraction by acid leaching， and coupled salt leaching-extraction，revealed that the salt leaching-oxidation cycle process consumes less water and incurs lower costs，making it highly promising for industrial application.
Key words： LiFePO4 ；leaching； oxidation cycle； regeneration； economic analysis
1前言
随着“双碳"战略实施，新能源汽车产业快速发展[1-3]。（剩余13038字）