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Flotation of Electrode Materials in Spent LiFePO4 Batteries Enhanced by Selective Flocculation
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Mei ZHAO1, Rui CUI1, Panwu LI2, Ming ZHANG1
Mining and Metallurgical Engineering | 2024, 44(4) : 126 - 131
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Mining and Metallurgical Engineering | 2024, 44(4): 126-131
• SPECIAL ISSUE: BATTERY MATERIALS •
Flotation of Electrode Materials in Spent LiFePO4 Batteries Enhanced by Selective Flocculation
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Mei ZHAO1, Rui CUI1, Panwu LI2, Ming ZHANG1
Affiliations
  • 1.School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
  • 2.Hubei Xingfa Chemical Group Co., Ltd., Yichang 443000, Hubei, China
Published: 2024-08-01 doi: 10.3969/j.issn.0253-6099.2024.04.024
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In the flotation process of electrode materials from spent LiFePO4 batteries, the occurrence of entrainment and entrapment usually leads to poor separation effect. Aiming at such problem, selective flocculation with polyvinylpiroxanone (PVP) and polyacrylic acid (PAA) was adopted to enhance the flotation effect in an experimental study, and the interaction mechanism between PVP and PAA and electrode materials was also analyzed. Results show that the firstly added PVP can be selectively adsorbed on the graphite surface by hydrogen bonding, thus inhibiting the spontaneous hydrophobic flocculation of graphite. Then, due to site-blocking effect, the subsequently-added PAA is inhibited to be adsorbed on the graphite surface, leading to selective flocculation of LiFePO4 by PAA. A combined usage of PVP and PAA can not only make graphite effectively dispersed, but also lead to apparent particle size (D50) of LiFePO4 cathode material increased from 15.01 μm to 26.17 μm. As a result, the loss of LiFePO4 due to entrainment in the flotation process of mixed electrode can be effectively reduced, thus the recovery rate of LiFePO4 cathode material by flotation process can be improved from 71.41% to 83.59%.

lithium iron phosphate  /  spent battery recycling  /  cathode material  /  graphite  /  electrode material  /  selective flocculation  /  flotation
Mei ZHAO, Rui CUI, Panwu LI, Ming ZHANG. Flotation of Electrode Materials in Spent LiFePO4 Batteries Enhanced by Selective Flocculation[J]. Mining and Metallurgical Engineering, 2024 , 44 (4) : 126 -131 . DOI: 10.3969/j.issn.0253-6099.2024.04.024
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Article Info
doi: 10.3969/j.issn.0253-6099.2024.04.024
  • Receive Date：2024-06-08
  • Online Date：2026-03-18
  • Published：2024-08-01
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  • Received：2024-06-08
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Affiliations
    1.School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
    2.Hubei Xingfa Chemical Group Co., Ltd., Yichang 443000, Hubei, China
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https://castjournals.cast.org.cn/joweb/kygczz/EN/10.3969/j.issn.0253-6099.2024.04.024
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表12种不同金属材料的力学参数
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Family		 属数
Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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