Device and method for removing impurities in high-lithium solution

Abstract

The invention discloses a device for removing impurities in a high-lithium solution. The device comprises a rotating plate, a plurality of adsorption columns connected to the rotating plate, and an adsorption module, an elution module and a regeneration module which are annularly arranged and sequentially adjacent. The rotating plate can drive the adsorption columns to sequentially pass through the adsorption module, the elution module and the regeneration module, so the circulate operation of adsorption, desorption, regeneration and re-absorption of impurities in the high-lithium solution is completed. The invention further discloses a method for removing impurities in the high-lithium solution on the basis of the device. By means of the method, by controlling the number of the adsorption columns located in each module and the flow of liquid flowing through the adsorption columns in each module, the adsorption efficiency of the adsorption columns is utilized to the maximum extent, it is ensured that the concentration of impurities in the obtained product material liquid is decreased to be lower than the required value, and the requirements can be met as battery level products and high-purity lithium salt products.

Description

Technical field [0001] The invention belongs to the technical field of separation and purification of inorganic material preparation, and specifically relates to a device for removing impurities in a high-lithium solution and a method based on the device. Background technique [0002] Global lithium resources mainly include lithium ore (mainly spodumene and lepidolite) and lithium-bearing salt lake brine. Currently, lithium salt products are mainly extracted from lithium-containing salt lake brines. Therefore, a large amount of calcium ions and / or magnesium ions in the lithium-containing salt lake brines will inevitably enter the lithium salt products, resulting in calcium ions and / or lithium salt products. The content of magnesium ions is as high as 200ppm~300ppm (that is, 200mg / L~300mg / L). Therefore, the lithium salt products prepared above generally only reach industrial grade. [0003] Generally, in the process of preparing lithium salt products, it is generally necessary to ...

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Problems solved by technology

At present, when using selective ion exchange technology to prepare high-purity lithium salt products, a fixed bed is generally used for ion exchange, but this method still has many disadvantages: such as low utilization efficiency of ion exchange resin, large amount of use, large consumption of acid and alkali, and water consumption Large, resulting in a lot of waste liquid, resulting in high cost. At the same time, because the concentration of high lithium solution will decrease due to dilution, the amount of mother liquor will increase; in addition, the equipment is huge, and the intermittent operation is performed by frequently switching valves, and the automation degree is low; Unstable quality

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