Source: CCTV News client


According to the University of Science and Technology of China, Professor Xu Tongwen's team recently successfully extracted lithium from the high magnesium lithium ratio salt lake brine in Taijiner, Qinghai province. Associate Researcher Jiang Chenxiao and Postdoctoral researcher Chen Binglun from the University of Science and Technology of China are the co-first authors of this work, and Professor Xu Tongwen is the corresponding author.

Inspired by the traditional multi-stage plate rectification mechanism and chromatography separation mechanism, in view of the separation problems of complex materials in the field of chemical special separation, the team originally proposed a concept of "ion rectification", and applied for the first time to extract lithium from high magnesium lithium ratio salt lake, which greatly improved the separation efficiency between special materials, and made lithium products with ultra-battery purity in one step from salt lake brine. The technical problem of extracting lithium from salt lake brine with high magnesia-lithium ratio is solved. The purity of lithium products obtained through ion rectification is 99.69% and 99.98%, which exceeds the industrial grade and battery grade standards respectively.

Lithium is an important raw material for chemical energy storage lithium batteries. Extracting lithium from salt lake is an important task to ensure the safety of lithium resources in China. Salt lake brines in China have the characteristics of high MG-lithium ratio, but the efficiency separation of lithium and magnesium is still a prominent problem in the process of extracting lithium from salt lakes with high MG-lithium ratio. This also directly leads to China's battery grade lithium products still need to be imported.

This new technology has wide applicability to salt lake brines with different solute systems, and is expected to achieve fine screening of valuable substances in brine, seawater, minerals, such as potassium, rubidium, cesium, magnesium, boron, etc., and promote the high-value utilization of target materials.

(Bureau Reporter Wang Ning)

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