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- Title
Efficient recovery of electrode materials from lithium iron phosphate batteries through heat treatment, ball milling, and foam flotation.
- Authors
Wang, Lei; Zhu, Huabing; Bi, Haijun; Bai, Yuxuan; Zhang, Chunchen
- Abstract
Efficient separation of small-particle-size mixed electrode materials, which are crushed products obtained from the entire lithium iron phosphate battery, has always been challenging. Thus, a new method for recovering lithium iron phosphate battery electrode materials by heat treatment, ball milling, and foam flotation was proposed in this study. The difference in hydrophilicity of anode and cathode materials can be greatly improved by heat-treating and ball-milling pretreatment processes. The micro-mechanism of double enhancement of flotation effect by pretreatment process was revealed by means of micro-morphology characterization and thermogravimetric analysis. Finally, the effects of rotational speed and aeration on flotation effect were investigated through experiments. Results showed that after heat treatment at 480 ℃ for 20 min and ball milling for 3 min, the yield and grade of lithium iron phosphate reached 96.3% and 93.5%, respectively, at rotational speed of 2800 r/min and aeration rate of 180 L/h, and the loss of lithium ion was only 67.83 mg/L. This method offers a purified electrode material suitable for the subsequent hydrometallurgical recovery process, thereby presenting a novel approach to recovering waste lithium-ion batteries.
- Subjects
HEAT treatment; BALL mills; FLOTATION; IRON; ELECTRODES; CARBON foams; ELECTRIC batteries; CHEMICAL purification
- Publication
Journal of Material Cycles & Waste Management, 2024, Vol 26, Issue 3, p1622
- ISSN
1438-4957
- Publication type
Article
- DOI
10.1007/s10163-024-01919-5