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Open AccessArticle

A Comprehensive Membrane Process for Preparing Lithium Carbonate from High Mg/Li Brine

School of Metallurgy and Environment, Central South University, Changsha 410083, China
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Membranes 2020, 10(12), 371; https://doi.org/10.3390/membranes10120371
Received: 21 October 2020 / Revised: 18 November 2020 / Accepted: 18 November 2020 / Published: 26 November 2020
(This article belongs to the Special Issue Electromembrane Processes: Experiments and Modelling)
The preparation of Li2CO3 from brine with a high mass ratio of Mg/Li is a worldwide technology problem. Membrane separation is considered as a green and efficient method. In this paper, a comprehensive Li2CO3 preparation process, which involves electrochemical intercalation-deintercalation, nanofiltration, reverse osmosis, evaporation, and precipitation, was constructed. Concretely, the electrochemical intercalation-deintercalation method shows excellent separation performance of lithium and magnesium, and the mass ratio of Mg/Li decreased from the initial 58.5 in the brine to 0.93 in the obtained lithium-containing anolyte. Subsequently, the purification and concentration are performed based on nanofiltration and reverse osmosis technologies, which remove mass magnesium and enrich lithium, respectively. After further evaporation and purification, industrial-grade Li2CO3 can be prepared directly. The direct recovery of lithium from the high Mg/Li brine to the production of Li2CO3 can reach 68.7%, considering that most of the solutions are cycled in the system, the total recovery of lithium will be greater than 85%. In general, this new integrated lithium extraction system provides a new perspective for preparing lithium carbonate from high Mg/Li brine. View Full-Text
Keywords: membrane process; Li2CO3; electrochemical intercalation deintercalation; high Mg/Li brine membrane process; Li2CO3; electrochemical intercalation deintercalation; high Mg/Li brine
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MDPI and ACS Style

Xu, W.; Liu, D.; He, L.; Zhao, Z. A Comprehensive Membrane Process for Preparing Lithium Carbonate from High Mg/Li Brine. Membranes 2020, 10, 371. https://doi.org/10.3390/membranes10120371

AMA Style

Xu W, Liu D, He L, Zhao Z. A Comprehensive Membrane Process for Preparing Lithium Carbonate from High Mg/Li Brine. Membranes. 2020; 10(12):371. https://doi.org/10.3390/membranes10120371

Chicago/Turabian Style

Xu, Wenhua; Liu, Dongfu; He, Lihua; Zhao, Zhongwei. 2020. "A Comprehensive Membrane Process for Preparing Lithium Carbonate from High Mg/Li Brine" Membranes 10, no. 12: 371. https://doi.org/10.3390/membranes10120371

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