Automatic system for preparing lithium hydroxide

Abstract

The invention provides an automatic system for preparing lithium hydroxide with low preparation cost. The automatic system for preparing lithium hydroxide, provided by the invention, comprises a preparation subsystem and is characterized by further comprising a protective air supply subsystem, a filtering device, a mother liquor storage device, an absorption tower, an air drying device and a feeding device, wherein the protective air supply subsystem is used for removing carbon dioxide from air so as to supply air free from carbon dioxide as protection air to the preparation technology of lithium hydroxide; the filtering device is used for filtering grains from air and comprises at least two filters, a valve component and a valve control unit; the remained lithium hydroxide mother liquor after crystal is separated from a concentrating crystallizing device is stored in the mother liquor storage device; the absorption tower introduces the lithium hydroxide mother liquor as an absorption agent for absorbing carbon dioxide in the filtered air so as to obtain the air free from carbon dioxide; the air drying device is used for drying the air free from carbon dioxide and obtaining the protective air; the feeding device is communicated with the air drying device and is used for feeding the protective air to the preparation subsystem.

Description

technical field [0001] The invention belongs to the field of battery material preparation, and in particular relates to an automatic system for preparing lithium hydroxide. 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, lith...

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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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