Lithium ion extraction device based on ion concentration polarization effect and extraction method thereof

Abstract

The invention discloses a lithium ion extraction device based on an ion concentration polarization effect and an extraction method thereof. The lithium ion extraction device comprises a main channel,an anion exchange permeable membrane and a buffer solution cavity, wherein a longitudinal barrier block, a plurality of uniformly distributed transverse barrier blocks and a cavity tube for extractinga lithium-rich solution into the main channel are sequentially arranged in the main channel; an inlet for the solution to flow in and out of the main channel and an outlet of the main channel are formed in two ends of the main channel; the buffer solution cavity is formed in the outer side of the main channel; and the main channel is connected with the buffer solution cavity through an anion selective permeable membrane. According to the lithium ion extraction device disclosed by the invention, the difference of electrophoresis mobility of different cations is utilized, the local water flow velocity and the local electric field intensity are changed by controlling the pressure at the inlet and adjusting the heights of the longitudinal and transverse barrier blocks in the main channel, andenrichment and extraction of lithium ions in the extraction cavity tube area are realized. The invention provides a stable and efficient lithium ion separation and extraction method which can be flexibly applied to the salt lake lithium extraction industry.

Description

technical field [0001] The invention belongs to the technical field of ion separation, and specifically refers to a lithium ion extraction device and an extraction method based on the ion concentration polarization effect. Background technique [0002] Lithium is closely related to people's lives. Lithium-ion batteries used in digital products such as laptops, mobile phones, and Bluetooth headsets carried by individuals contain abundant lithium elements. Lithium-ion batteries are high-energy storage media. Due to the rapid development of lithium-ion batteries, the business of lithium mines and lithium carbonate companies has flourished. Lithium metal batteries are also used in the military field. [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 producing lithium salt p...

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Problems solved by technology

However, most of these methods have a series of problems such as instrument dissolution loss and high cost, and most of the methods are only used for brine with low magnesium-lithium ratio.

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