A device for extracting lithium from salt lakes based on ion concentration polarization effect

Abstract

The invention discloses a salt lake lithium extraction device based on the ion concentration difference polarization effect. The device comprises a main channel, a lithium sodium solution cavity and abuffer liquid cavity; an ion selective block is arranged in the middle of the main channel, one or multiple parallel micron channels are formed in the ion selective block in the pipeline direction, the ion selective block is made of a cathode selective permeable membrane material, the cathode selective permeable membrane material has electrical conductivity and only allows negative ions to pass through, however, positive ions and water cannot pass through. The difference of electrophoretic mobility of different positive ions is used for enriching lithium ions on the position closest to the position nearby the ion selective cylindrical block, then, sodions and magnesium ions are selected, and potassium ions are not enriched in the channels. Therefore, micron holes are punched in the frontchannel wall close to the ion selective cylindrical block, enriched lithium ions are drained to the lithium sodium solution cavity, and are guided out to a finished product lithium sodium solution pond from a lithium sodium solution outlet. The characteristic that the concentration of the sodions is obviously larger than the magnesium ions and lithium ions, and the enriching area of the sodions isbetween magnesium and lithium, sufficient separation of the magnesium ions and the lithium ions is achieved.

Description

technical field [0001] The invention belongs to the field of lithium extraction equipment from salt lakes, and specifically refers to a device for extracting lithium from salt lakes based on the ion concentration polarization effect. Background technique [0002] The application of lithium and its compounds has developed from traditional industries such as glass, ceramics, nonferrous metallurgy, air conditioning, medicine, lubricants, welding materials, etc. to high-tech fields such as lithium-ion batteries, national defense, etc. Since the discovery of lithium-ion batteries by scientific researchers in the last century, the wide application of lithium-ion batteries has revolutionized the face of consumer electronics. [0003] At present, more than 3 / 4 of the lithium reserves on the earth exist in salt lakes, and the cost of extracting lithium from salt lakes is about half lower than that from ores. Therefore, extracting lithium from raw liquid has become the main way of pro...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and to provide a parallel device for extracting lithium from salt lakes based on the ion concentration polarization effect. High-efficiency extraction, overcoming the problems of existing technologies such as relying on expensive detection equipment, low extraction efficiency, and high cost

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