Preparation system for lithium hydroxide

Abstract

The invention provides a preparation system for lithium hydroxide. The preparation system for lithium hydroxide comprises a preparation subsystem and is characterized by further comprising a shielding gas feeding subsystem, a filtering device, a mother liquor storage device, an absorbing tower, a gas drying device and a feeding device, wherein the shielding gas feeding subsystem is used for removing carbon dioxide from air so as to supply the air free from carbon dioxide as a shielding gas for a preparation technology of lithium hydroxide; the filtering device is used for filtering particles in air and comprises an air inlet, a filtering part and an air outlet; the mother liquor storage device is used for storing the remained lithium hydroxide mother liquor after the crystal is separated in a concentrating crystallizing device; the absorbing tower is used for introducing the lithium hydroxide mother liquor as an absorbing agent for absorbing the carbon dioxide in the air after being filtered, so that the air free from carbon dioxide can be obtained; the gas drying device is used for drying the air free from carbon dioxide, so as to obtain the shielding gas; the feeding device is used for supplying the shielding gas to the preparation subsystem.

Description

technical field [0001] The invention belongs to the field of battery material preparation, and in particular relates to a lithium hydroxide preparation system. Background technique [0002] With the application of lithium-ion batteries in new energy vehicles, cathode materials with high nickel and high energy density have become a development trend. At present, high-nickel cathode materials generally use lithium hydroxide as a raw material. Compared with lithium carbonate, lithium hydroxide may better meet the requirements of future lithium battery materials because of its advantages in crystal structure and solubility. The general trend of continuous improvement of energy density". [0003] Now, the following processes and devices are generally used to prepare battery-grade lithium hydroxide products: [0004] 1) Raw material removal, use the raw material removal device to use crude lithium carbonate, industrial grade lithium carbonate, lithium chloride, lithium sulfate, ...

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Problems solved by technology

[0010] In the above production process, the prepared lithium hydroxide can easily absorb carbon dioxide in the air and regenerate lithium carbonate. In order to avoid reaction with carbon dioxide, ensure that the carbonate content in the product is ≤0.7wt.% to meet the purity standard. Inert gas, such as nitrogen, argon, etc., will be introduced into the chemicalization device, concentration crystallization device, crystal drying device, crushing device, and screening and packaging device as a protective gas to prevent carbon dioxide in the air from entering, but the above-mentioned preparation process takes a long time , There are many devices used, and the consumption of inert gas is very large, which greatly increases the preparation cost of lithium hydroxide

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