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Selective Leaching of Spent LiFe0.4Mn0.6PO4 in a System of DL-Malic Acid and Sodium Persulfate
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Yongqi LIU1, 2, Qinxue GONG1, 2, Qi ZHOU1, Yu ZHENG1, Yunguang YANG2, 3, Honghui TANG1, 2, 3
Mining and Metallurgical Engineering | 2025, 45(3) : 163 - 167
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Mining and Metallurgical Engineering | 2025, 45(3): 163-167
• METALLURGY •
Selective Leaching of Spent LiFe0.4Mn0.6PO4 in a System of DL-Malic Acid and Sodium Persulfate
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Yongqi LIU1, 2, Qinxue GONG1, 2, Qi ZHOU1, Yu ZHENG1, Yunguang YANG2, 3, Honghui TANG1, 2, 3
Affiliations
  • 1.Hunan Brunp Recycling Technology Co., Ltd., Changsha 410600, Hunan, China
  • 2.Guangdong Brunp Recycling Technology Co., Ltd., Foshan 528100, Guangdong, China
  • 3.Guangdong Provincial Key Laboratory of Battery Recycling Enterprises, Foshan 528100, Guangdong, China
Published: 2025-06-01 doi: 10.3969/j.issn.0253-6099.2025.03.027
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With spent lithium manganese iron phosphate cathode powder as raw material, a leaching system of DL-malic acid combined with sodium persulfate was employed to selectively recover Li, Mn and Fe elements. The effects of factors, including DL-malic acid concentration, molar ratio of Na2S2O8 to LiFe0.4Mn0.6PO4, liquid-to-solid ratio, leaching temperature, and leaching time on the leaching rates of Li, Fe, Mn and P were investigated. Then, the left leaching residue was analyzed by using SEM and XRD, and the leachate was analyzed by FTIR. Results show that with DL-malic acid at a concentration of 0.4 mol/L, Na2S2O8 and LiFe0.4Mn0.6PO4 at a molar ratio of 0.4, liquid-to-solid ratio of 15 mL/g, 3 h leaching process at 30 ℃ can bring the leaching rates of Li, Fe, Mn and P at 98.76%, 2.37%, 96.89% and 52.45%, respectively, and also Li, Fe, Mn and P in the leachate in a mass concentration of 2.98, 0.21, 12.66 and 6.52 g/L, respectively. It is found that iron phosphate is the dominant component in the leaching residue. During the leaching process, DL-malic acid and Mn2+ form a complex that can be solved in leachate, leading to efficient separation between iron and manganese.

spent battery recycling  /  spent LiFe0.4Mn0.6PO4  /  cathode powder  /  Na2S2O8  /  DL-malic acid  /  selective leaching
Yongqi LIU, Qinxue GONG, Qi ZHOU, Yu ZHENG, Yunguang YANG, Honghui TANG. Selective Leaching of Spent LiFe0.4Mn0.6PO4 in a System of DL-Malic Acid and Sodium Persulfate[J]. Mining and Metallurgical Engineering, 2025 , 45 (3) : 163 -167 . DOI: 10.3969/j.issn.0253-6099.2025.03.027
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Year 2025 volume 45 Issue 3
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Article Info
doi: 10.3969/j.issn.0253-6099.2025.03.027
  • Receive Date：2025-01-03
  • Online Date：2026-03-19
  • Published：2025-06-01
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  • Received：2025-01-03
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Affiliations
    1.Hunan Brunp Recycling Technology Co., Ltd., Changsha 410600, Hunan, China
    2.Guangdong Brunp Recycling Technology Co., Ltd., Foshan 528100, Guangdong, China
    3.Guangdong Provincial Key Laboratory of Battery Recycling Enterprises, Foshan 528100, Guangdong, China
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表12种不同金属材料的力学参数
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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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