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| Lithium Extraction Process from Spent LiFePO4 Batteries by Sodium Salt Roasting |
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Received:January 24, 2024
Revised:February 04, 2024
Accepted:February 05, 2024
Published Online:June 05, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.07.011 |
| KeyWord:LiFePO4; sodium sulfate; roasting; water leaching; lithium sulfate |
| Author | Institution |
| HE Junwei |
江西环锂新能源科技有限公司;上饶市环锂循环科技有限公司 |
| XU Jianbin |
南昌航空大学环境与化学工程学院;南昌航空大学环境与化学工程学院 |
| CHEN Zike |
江西环锂新能源科技有限公司 |
| YI Wu |
江西环锂新能源科技有限公司 |
| YAN Haifeng |
江西环锂新能源科技有限公司 |
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| Abstract: |
| The harmless treatment and resource recycling of spent lithium-ion batteries is an inevitable choice to protect the environment, save resources, and promote the development of circular economy. A process of sodium salt roasting and water leaching at room temperature was proposed to recover lithium from spent LiFePO4 batteries. The effects of sodium sulfate addition, roasting temperature, and roasting time on the selective leaching of lithium were systematically studied, and the roasted products were characterized by XRD and SEM. The results show that under the conditions of mass ratio of sodium sulfate to LiFePO4 cathode powder of 1.6, roasting temperature of 650 ℃, water leaching time of 15 minutes, and roasting time of two hours, the lithium leaching rate is 96.81%, and the purity of the recovered lithium sulfate product is 97.36%. Compared with traditional methods, this process has the advantages of no use of strong acid, high efficiency separation of lithium iron and simple recovery process, and has broad industrial application prospects. |
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