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Chemcial Industry and Engineering 2021, Vol. 38 Issue (6) :46-52    DOI: 10.13353/j.issn.1004.9533.20213001
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Study on the Leaching of Spent NCM Cathode Metals Assisted by Walnut Shell-based Low Temperature Reduction
Yuan Peng1,2, Ma Haofei2, Shen Boxiong1,2, Ji Zhiyong1
1. School of Chemical Engineering & Technology, Hebei University of Technology, Tianjin 300401, China;
2. Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, China

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Abstract Concerning the bottleneck problem of efficient recovery of valuable metals in spent ternary lithium-ion batteries, a method of low-temperature carbothermal reduction with biomass as reductant to strengthen the leaching of valuable metals in cathode materials was proposed. The effect of low-temperature carbothermal reduction pretreatment with walnut shell as reducing agent on the leaching and recovery efficiency of metals from spent NCM523 cathode was studied. The results showed that there is an obvious phase transition peak in the mixture than walnut shell or spent NCM523 in the lower temperature range of 450~500℃. Li2CO3 in the reduction product can be recovered efficiently after water washing; After washing by citric acid, 45.53%, 47.49% and 90.08% of Ni, Co and Mn could be recycled from the leaching solution, respectively.
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Articles by authors
Yuan Peng
Ma Haofei
Shen Boxiong
Ji Zhiyong
Keywordsbiomass   carbonthermal reduction   spent ternary Li-ion battery   valuable metals   leaching     
Received 2021-09-07;
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Yuan Peng, Ma Haofei, Shen Boxiong, Ji Zhiyong.Study on the Leaching of Spent NCM Cathode Metals Assisted by Walnut Shell-based Low Temperature Reduction[J]  Chemcial Industry and Engineering, 2021,V38(6): 46-52
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