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Article

Recovery of Lithium from Lepidolite by Sulfuric Acid and Separation of Al/Li by Nanofiltration

by 1,2,3, 1,2,*, 1,2 and 1,2,*
1
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
2
Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(11), 981; https://doi.org/10.3390/min10110981
Received: 2 September 2020 / Revised: 27 October 2020 / Accepted: 30 October 2020 / Published: 4 November 2020
(This article belongs to the Section Mineral Processing and Extractive Metallurgy)
The recovery and leaching kinetics of lithium from lepidolite by sulfuric acid method were investigated in this study, and a new method of nanofiltration to separate Al/Li from lepidolite leaching solution was coupled. The results indicated the optimal conditions about leaching lithium from lepidolite: leaching at 433 K for 4 h with the agitation rate of 120 r min−1, sulfuric acid concentration of 60 wt%, liquid-solid mass ratio of 2.5:1, under which the Li yield could reach at 97%. The kinetics observations revealed that the leaching process was controlled by the hybrid control of solid product layer diffusion and the chemical reaction, and dominated by chemical reaction step, which improved the conclusion of single-step control in the previous literature. A successful attempt was made to couple nanofiltration separation with sulfuric acid extraction of lithium, and DK membrane was used to separate Al/Li from lepidolite leaching solution. DK membrane has shown excellent retention of Al3+ and Ca2+ and also can effectively permeate Li+, which may bring a new inspiration for lithium extraction from lepidolite in the future. View Full-Text
Keywords: sulfuric acid method; lithium extraction; kinetics; nanofiltration; separation of aluminum and lithium sulfuric acid method; lithium extraction; kinetics; nanofiltration; separation of aluminum and lithium
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MDPI and ACS Style

Gao, L.; Wang, H.; Li, J.; Wang, M. Recovery of Lithium from Lepidolite by Sulfuric Acid and Separation of Al/Li by Nanofiltration. Minerals 2020, 10, 981. https://doi.org/10.3390/min10110981

AMA Style

Gao L, Wang H, Li J, Wang M. Recovery of Lithium from Lepidolite by Sulfuric Acid and Separation of Al/Li by Nanofiltration. Minerals. 2020; 10(11):981. https://doi.org/10.3390/min10110981

Chicago/Turabian Style

Gao, Lin, Huaiyou Wang, Jinli Li, and Min Wang. 2020. "Recovery of Lithium from Lepidolite by Sulfuric Acid and Separation of Al/Li by Nanofiltration" Minerals 10, no. 11: 981. https://doi.org/10.3390/min10110981

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