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| Recovery of Valuable Metals from Spent Lithium Ion Batteries via Reduction Roasting and Sulfamic Acid Leaching |
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Received:June 10, 2022
Revised:June 14, 2022
Accepted:June 20, 2022
Published Online:September 16, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.10.001 |
| KeyWord:spent lithium-ion batteries; leaching; reduction roasting; sulfamic acid |
| Author | Institution |
| PAN Yue |
中南大学 化学化工学院 |
| YE Hua |
中南大学 化学化工学院 |
| LI Hao-yu |
中南大学 化学化工学院 |
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| Abstract: |
| A process combining reduction roasting with sulfamic acid leaching was proposed for leaching of valuable metals from spent LiNixCoyMn1-x-yO2(NCM) cathode materials to improve recovery efficiency of lithium, and realize separation and recovery of components. The results indicate that Li2CO3, NiO, MnO, Ni and Co are mainly reduction products at 650 ℃ for 90 min with 10% carbon in the reduction roasting process. Lithium is effectively recovered through reduction roasting - water leaching from spent NCM cathode materials. Subsequently, sulfamic acid is selected as leaching agent to recover Ni, Co, Mn. Leaching rate of Ni, Co, and Mn is 98.77%, 98.71% and 98.45% respectively under the optimum acid leaching conditions including sulfamic acid concentration of 0.75 mol/L, leaching temperature of 60 ℃, ratio of solid to liquid of 28 g/L, and leaching time of 40 min. |
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