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Production process of micro-powder-grade lithium hydroxide monohydrate

A monohydrate lithium hydroxide, production process technology, applied in the direction of lithium oxide;/hydroxide, sulfate/bisulfate preparation, etc., can solve the problems of uneven mixing, slow melting of lithium hydroxide, etc., and achieve crushing The effect of high efficiency, fine particle size and high purity

Pending Publication Date: 2020-07-24
广西雅保锂业有限公司
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Problems solved by technology

The products produced by the traditional process are in the form of coarse particles. The larger the particles, the slower the melting of lithium hydroxide in battery production, and the uneven mixing. Therefore, customers will require the product to be in the form of fine powder, with a particle size of D50=3-16μm. Need to develop a production process that meets the above requirements

Method used

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  • Production process of micro-powder-grade lithium hydroxide monohydrate

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Such as figure 1 Shown, the production technique of micropowder grade lithium hydroxide monohydrate of the present invention comprises the following steps:

[0021] 1) The spodumene is sequentially calcined, cooled, finely ground, and reacted with acid, and the product to be reacted with acid is cooled to ≤90°C and then made into a slurry with water. The solid content of the slurry is 10%-70%, and the calcination temperature is 950- 1200°C, after calcination, cool to below 60°C, the particle size of the fine grinding is required to be 200 mesh, add sulfuric acid with a concentration of 98% in the acid addition reaction, and the ratio of acid to material is 2-4:1;

[0022] 2) Add calcium salt to the above slurry and stir for leaching. The calcium salt is mixed with water to form a slurry with a solid content of 10%-55%. The temperature in the l...

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Abstract

The invention discloses a production process of micro-powder-grade lithium hydroxide monohydrate. The production process comprises the following steps: (1) sequentially calcining spodumene, cooling the calcining product, finely grinding the calcining product, adding acid for reaction, and then mixing the obtained powder and the acid into slurry; (2) adding calcium salt into the slurry, and carrying out stirring and leaching; (3) filtering the filtered clear liquid again, and purifying the filtered clear liquid by using an alkaline solution; (4) filtering the causticized solution; (5) freezingthe filtered causticized liquid in a freezing workshop to separate out sodium sulfate decahydrate and a lithium hydroxide solution; (6) evaporating, concentrating and purifying the sodium sulfate decahydrate; (7) screening and weighing the sodium sulfate decahydrate; (8) carrying out shunting; (9) carrying out crushing; (10) carrying out grading; and (11) carrying out packaging.

Description

technical field [0001] The invention relates to the technical field of lithium hydroxide production, in particular to a production process of micropowder grade lithium hydroxide monohydrate. Background technique [0002] Lithium hydroxide is widely used in chemical raw materials, metallurgy, battery industry, ceramics, national defense, atomic energy, aerospace and other industries. In the battery industry, it is used as an additive for alkaline storage batteries, which can prolong its life and increase storage capacity. At present, the main method of producing lithium hydroxide monohydrate is to use spodumene as raw material, and undergo high-temperature calcination transformation, acidification roasting, freezing and separation of sodium sulfate, evaporation, low-temperature recrystallization and other process steps. The products produced by the traditional process are in the form of coarse particles. The larger the particles, the slower the melting of lithium hydroxide in...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01D5/02
CPCC01D15/02C01D5/02C01P2006/82C01P2004/61
Inventor 何开茂何东利汪梨超伍震洲吴金友胡见平谭培渊
Owner 广西雅保锂业有限公司
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