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

Abstract

The invention discloses a lithium ion extraction device based on the ion concentration polarization effect and an extraction method thereof. A horizontal barrier block, a lumen for extracting lithium-rich solution into the main channel, the two ends of the main channel are provided with an inlet and an outlet for the solution to flow in and out of the main channel, a buffer solution chamber is arranged outside the main channel, the main channel and the buffer solution chamber connected by an anion permselective membrane. The patent of the present invention utilizes the difference in electrophoretic mobility of different cations to change the local water flow velocity and local electric field strength by controlling the pressure at the entrance and adjusting the height of the longitudinal and transverse barrier blocks in the main channel, so as to realize the extraction of lithium in the cavity area. Ion enrichment and extraction. The invention provides a stable and efficient method for separating and extracting lithium ions, which can be flexibly used in the industry of extracting lithium from salt lakes.

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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