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| Selective Recovery of Lithium from Spent Ternary Lithium Batteries by Roasting with Potassium Pyrosulphate at Low Temperature |
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Received:August 09, 2021
Revised:August 16, 2021
Accepted:August 19, 2021
Published Online:November 19, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.12.007 |
| KeyWord:spent lithium battery; potassium pyrosulphate; roasting at low temperature; leaching with potassium oxalate; selective recovery |
| Author | Institution |
| JI Hai-yan |
南昌航空大学环境与化学工程学院 |
| LIU Jia-yin |
南昌航空大学建筑工程学院 |
| ZHANG Jie-fei |
南昌航空大学环境与化学工程学院,南昌航空大学建筑工程学院 |
| MI Xue |
南昌航空大学环境与化学工程学院 |
| LIU Chun-li |
南昌航空大学环境与化学工程学院 |
| XIE Man-hua |
南昌航空大学环境与化学工程学院,南昌航空大学建筑工程学院 |
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| Abstract: |
| Selective recovery of lithium from cathode materials of spent ternary lithium battery was realized by combining low-temperature potassium pyrosulphate roasting with salt solution leaching. Effects of roasting temperature, mass ratio of potassium pyrosulphate to cathode material, and roasting time on recovery of lithium, cobalt, nickel and manganese were systematically studied. The results show that recovery of Li, Ni, Co and Mn is 97.21%, 2.61%, 3.1% and 10.8%, respectively after leaching with potassium oxalate solution under the conditions including roasting temperature of 350 ℃, mass ratio of cathode material to potassium pyrosulfate of 1︰2, and roasting time of 60 min. At the same time, XRD, SEM and EDS were used to characterize crystal structure, surface morphology and elemental composition changes of the materials before and after roasting. Phase transformation mechanism of lithium, cobalt, nickel and manganese during calcination process of potassium pyrosulphate is further clarified. Compared with traditional wet process, pyrogenic process and biological metallurgy process, this recovery technology has the characteristics of low energy consumption and high application prospect. |
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