A salt lake lithium extraction device based on ion concentration polarization effect

Abstract

The invention belongs to the field of lithium extraction equipment in salt lakes, and specifically relates to a lithium extraction device in salt lakes based on ion concentration polarization effect, which includes a main channel, on which first buffer pipes are sequentially arranged for feeding into the main channel. The brine tube for extracting the original solution, the lithium-rich solution cavity tube, and the second buffer tube. The two ends of the main channel are respectively provided with a first outlet and a second outlet. The inside of the main channel is provided with a first anion selective block with several channels. and a second anion selective block. The invention utilizes the locally enhanced electric field in the channel caused by the ion concentration polarization effect to realize lithium ion enrichment and lithium-magnesium separation, the solution flow is driven by the pressure at the inlet and outlet, and high-concentration lithium is collected through the openings on the pipeline solution. Different from the direct parallelization of micro-channels, this device realizes the large-scale parallelism of micro-channels by processing a large number of micro-scale channels on ion-selective materials.

Description

technical field [0001] The invention belongs to the field of salt lake lithium extraction equipment, and in particular relates to a salt lake lithium extraction device based on ion concentration polarization effect. Background technique [0002] Lithium battery is a high-quality energy source developed in the 1930s and 1940s. It has been widely used in various fields due to its high open circuit voltage, high specific energy, wide operating temperature range, balanced discharge, and self-discharging electrons. It is a promising power battery. [0003] There are many salt lakes in my country, all types, rich resources, and rich in rare elements. The lithium salt reserves of salt lakes account for more than 80% of the total lithium resources in my country and 1 / 3 of the world's total lithium reserves in salt lakes. At present, the proven global lithium reserves have reached 14 million tons. my country's lithium reserves are 3.2 million tons, ranking second in the world after...

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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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