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Recovery of Lithium from High Mg/Li Ratio Brines by solvent Extraction Process

Recovery of Lithium from High Mg/Li Ratio Brines by Solvent ...

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中国化学会第六届全国热分析动力学与热动力学学术会议

作者： Shangqing Chen Xiaoping Yu Yafei Guo Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin Univ of Sci & Technol College of Chemistry and Materials Science Northwest University

Lithium regarded as one of the strategic elements, plays a more and more important role in national economy and has been extensively applied in various industrial fields, especially lithium-ion battery [1-2]. Natural lithium resources mainly associate with granite pegmatite type solid ores, and the liquid resources such as salt lake brine, seawater and geothermal water, and due to the high recovery costs and limited availability of spodumene minerals, seeking a feasible and economical approach to extract lithium ion from lithium-containing brines is an inevitable tendency in future lithium industry. Liquid brine resources with high concentrations of lithium ion in salt lake and underground brine are widely distributed in the western four provinces named Qinghai, Tibet,Sichuan and Inner Mongolia, China [3].It is worthy of mentioning that the mass ratio of magnesium and lithium is fairly high in the Qaidam Basin, Qinghai Province, and magnesium presents a major challenge for lithium extraction for similar chemical properties of magnesium and lithium. Aiming at that, in our present work, a novel co-extraction system of TBP-KPF was used in the extraction for lithium from brines and the technological parameters for lithium extraction and back-extraction were optimized. As a result, the single-stage extraction efficiency and back-extraction efficiency were no less than85%.

关键词： solvent Extraction Process solvent mechanism Lithium Recovery Salt lakes

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