When it comes to lithium, people are familiar with it. Lithium is the main raw material for batteries ranging from new energy vehicles to cell phone batteries.

　　Lithium is "reused" because of its extremely abundant reserves in the world. According to data from the US Geological Survey, global lithium reserves are 13 million tons and lithium resources are 39.5 million tons. Among them, 76% of lithium resources exist in salt lake brine. 85% of my country's proven reserves of lithium resources also exist in salt lake brines.

　　Salt lake brine is mainly distributed in the Andes Plateau of South America and the Qinghai-Tibet Plateau of my country. Generally, the higher the average concentration of lithium in the brine and the lower the "Mg-Li ratio", the more conducive to the extraction of lithium.

　　The "magnesium-lithium ratio" of most salt lake brines in my country is dozens or even hundreds of times higher than that of foreign high-quality salt lake brines. With the existing technology, it is difficult to achieve large-scale, high-efficiency, clean, and clean lithium resources of salt lakes with high "magnesium-lithium ratio". Economic development and production. It is also difficult to reduce the "Mg-Li ratio" of brine, and the development of high "Mg-Li ratio" brine resources in my country and even the world cannot substantially release its production capacity. Therefore, even though my country is a big country with lithium resources, its external dependence on lithium resources is still as high as 70%. Importing high-quality brines from South America to extract lithium is the norm.

　　How to reduce the "Mg-Li ratio" has become a key technical bottleneck in the development of salt lake high-Mg-Li ratio brine lithium resources, and it is also a world-class problem facing industry experts.