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| Low-temperature curing and water leaching process for lithium extraction from spent pot lining |
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Received:May 07, 2025
Revised:May 12, 2025
Accepted:May 13, 2025
Published Online:August 05, 2025
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| DOI： |
| KeyWord:Spent pot lining; Hazardous waste treatment; Sulfuric acid curing; Water leaching; Lithium; |
| Author | Institution |
| Xu Longlong |
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing |
| MA Baozhong |
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing |
| LIU Yubo |
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing |
| ZHOU Huidong |
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing |
| CHEN Yongqiang |
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing |
| WANG Chengyan |
School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing |
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| Abstract: |
| Spent pot lining (SPL) is a hazardous waste generated during the aluminum electrolysis process. The efficient extraction of the valuable element lithium from SPL not only effectively addresses the environmental pollution caused by stockpiling but also achieves the goal of resource utilization. This paper proposes a low-temperature sulfuric acid curing and water leaching process for the efficient extraction of lithium from SPL. Thermodynamic calculations indicate that lithium in SPL can react with sulfuric acid to form soluble lithium sulfate within a certain curing temperature range. Furthermore, the effects of parameters such as sulfuric acid dosage, curing temperature, and curing time on the curing efficiency were systematically investigated. The optimal process conditions were determined as follows: m(H2SO4)/m(SPL) ratio of 1.5, curing temperature of 230 ℃, and curing time of 3 h. Under these conditions, the lithium leaching rate reached 87.48%. After three cycles water leaching process, the lithium content in the leachate was 4.77 g/L. Phase analysis of the raw material, cured product, and leaching residue was conducted using XRD and SEM-EDS. Characterization revealed that lithium in the cured product existed in the form of KLiSO4, and the diffraction peaks of this phase disappeared after water leaching. The hydrogen fluoride gas generated during the curing process was absorbed by sodium hydroxide solution and subsequently used in the aluminum recovery process, achieving the cyclic utilization of fluorine. The process presented in this paper offers a green and efficient method for the treatment of SPL. |
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