Lithium industry in central and southern China: electrochemical de-intercalation method for lithium extraction from salt lake with extremely low energy consumption can greatly contribute to the construction of world-class salt lake industry.

Electrochemical de-intercalation is a new technology for extracting lithium from salt lakes at home and abroad. it draws lessons from the working principle of lithium-ion battery and sets up a new technology system to extract lithium.

The working voltage of electrochemical de-intercalation method is much lower than that of lithium-ion battery. This is due to the fact that the electrodes used in the electrochemical de-intercalation method are paired by lithium iron phosphate and ferric phosphate (or lithium manganate and manganese dioxide), and the operating voltage is only 0.3-0.5 volts. The electrodes of lithium-ion batteries are paired with lithium iron phosphate and graphite (or lithium manganate and graphite) and have a high voltage of 3.4 volts (4.1 volts for lithium manganate batteries).

To extract lithium, the brine needs to be pumped from the salt lake, and after the lithium is lifted, the brine needs to be pumped away. For a specific salt lake, the brine concentration is generally certain, no matter what kind of lithium extraction process requires roughly the same amount of brine, then the power consumption of the pump water is roughly the same, so this part of the energy consumption is roughly the same (of course, to a certain extent, the amount of pumping water is related to the lithium extraction rate of the technology used, the higher the lithium extraction rate is, the smaller the pump water volume is, and if the lithium extraction rate is low, the pump water volume needs to be increased. The lithium extraction rate of electrochemical de-intercalation is very high. Therefore, roughly speaking, this part of the energy consumption of various processes is roughly the same.

The concentration of lithium-rich solution obtained by electrochemical de-intercalation method can be stabilized at 4-5 g / L. This is another advantage of this law. Imagine that if you get a low concentration of lithium solution of 0.4-0.5 g / L, then you have to remove 90% of the solution and concentrate it to 10 times to reach 4-5 g / L, which will require 2000 kilowatt-hours of electricity (in terms of membrane concentration technology). The electrochemical de-intercalation method does not need this additional energy consumption.

In addition, the electrochemical de-intercalation method has high adaptability to brine, which can extract lithium from carbonate type, sulfate type and chloride type brine, and can treat not only old brine but also raw brine.

With the establishment of the dual-carbon goal of "carbon peak and carbon neutralization" and the rise of the global concept of low-carbon lithium, Tibet LiNeng Lithium Industry Technology Co., Ltd. will adhere to the business philosophy of "superb technology, excellent products, and sincere service". With a strong technical background and strict international standards, actively respond to General Secretary Xi's call to be based on salt lake resources and adhere to green and low-carbon development. We will support the "positive cycle" of the development of the global new energy industry and devote ourselves to the construction of a world-class salt lake industry.