Method for recycling and preparing lithium iron phosphate from waste lithium iron phosphate positive electrode material
By employing steps such as roasting, acid leaching, nanofiltration membrane separation, and oxalic acid precipitation, the problems of lengthy processes and reagent consumption in the recycling of waste lithium iron phosphate have been solved. This has enabled efficient and low-cost full-component recovery and regenerated lithium iron phosphate preparation, improving product purity and membrane module lifespan.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GEM CO LTD
- Filing Date
- 2026-05-09
- Publication Date
- 2026-07-17
AI Technical Summary
Existing waste lithium iron phosphate recycling technologies suffer from problems such as lengthy processes, high reagent consumption, severe lithium loss, low product purity, and membrane module contamination, making it difficult to achieve stable industrial operation and efficient resource utilization.
By employing steps such as calcination, acid leaching, acid-resistant nanofiltration membrane separation, impurity removal, and oxalic acid precipitation, and through precise control of leaching conditions and separation parameters, efficient separation of Fe2+ and Li+/H2PO4- is achieved, avoiding lengthy steps and consumption of acid and alkali reagents, preventing Fe2+ oxidation, and synthesizing regenerated lithium iron phosphate cathode materials.
It achieves efficient recovery of lithium, iron, and phosphorus, with product purity reaching battery-grade standards, reducing the generation of waste, extending the life of membrane modules, realizing closed-loop regeneration of all components, and reducing costs.
Smart Images
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