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Lithium hydroxide monohydrate preparation system

A technology of monohydrate lithium hydroxide and lithium hydroxide, applied in the direction of lithium oxide;/hydroxide, can solve the problems of low lithium yield and lithium loss, and achieve stable industrial process, high yield and product quality. Stable and controllable effect

Pending Publication Date: 2017-10-24
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) Freezing sodium and multiple evaporation and crystallization processes will cause a large amount of loss of lithium, and the yield of lithium is low

Method used

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  • Lithium hydroxide monohydrate preparation system
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Examples

Experimental program
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Effect test

Embodiment 1

[0055] Adopt carbonization impurity removal device, add 200g industrial pure lithium carbonate (main content 97wt%) into 2L pure water, stir, pass into carbon dioxide gas, until lithium carbonate dissolves completely, stop ventilating. Add 0.2g of EDTA to it, stir to dissolve, and filter to obtain clear liquid. Then the clear liquid was heated to 90° C., and stirred while heating, a white solid was seen to be precipitated, and filtered to obtain refined lithium carbonate with a main content of 99 wt%. The prepared refined lithium carbonate and freshly prepared calcium hydroxide are supplied to the causticization device for causticization reaction, the reaction temperature is 95°C, the reaction time is 1h, and after the reaction, the lithium hydroxide solution is obtained by filtration. The lithium hydroxide solution is supplied to the ion exchange device, and passed through the reaction tower loaded with large-pore cation exchange resin D401 to obtain a refined lithium hydroxi...

Embodiment 2

[0057] Adopt carbonization impurity removal device, join 200g industrial pure lithium carbonate (main content 97wt%) into 4.4L pure water, stir, pass into carbon dioxide gas, until lithium carbonate dissolves completely, stop ventilating. Add 0.3g of EDTA to it, stir to dissolve, and filter to obtain clear liquid. Then the clear liquid was heated to 85° C., and stirred while heating, a white solid was seen to be precipitated, and filtered to obtain refined lithium carbonate with a main content of 99 wt%. The prepared refined lithium carbonate and freshly prepared calcium hydroxide are supplied to the causticizing device for causticizing reaction, the reaction temperature is 95°C, and the reaction time is 0.5h. After the reaction, the lithium hydroxide solution is obtained by filtration. The lithium hydroxide solution is supplied to the ion exchange device, and passed through the reaction tower loaded with large-pore cation exchange resin D401 to obtain a refined lithium hydrox...

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Abstract

The present invention discloses a lithium hydroxide monohydrate preparation system, which comprises: a carbonization impurity removing device provided with a crude lithium carbonate inlet, a water inlet, a carbon dioxide inlet, an EDTA inlet and a refined lithium carbonate outlet; a causticization device provided with a refined lithium carbonate inlet, a lime milk inlet and a lithium hydroxide completion liquid outlet; an ion exchange device provided with a lithium hydroxide completion liquid inlet and a refined lithium hydroxide purification liquid outlet; an evaporation crystallization device provided with a refined lithium hydroxide purification liquid inlet and a crude wet lithium hydroxide monohydrate outlet, wherein the refined lithium hydroxide purification liquid inlet is connected to the refined lithium hydroxide purification liquid outlet; and a post-treatment device provided with a crude wet lithium hydroxide monohydrate inlet and a lithium hydroxide monohydrate outlet, wherein the crude wet lithium hydroxide monohydrate inlet is connected to the crude wet lithium hydroxide monohydrate outlet. According to the present invention, with the system, the high-purity lithium hydroxide monohydrate can be prepared by using the industrial-grade or sub-industrial-grade lithium carbonate crude product, the industrial process is stable, the quality of the product is stable and controlled, and the yield is high.

Description

technical field [0001] The invention relates to the field of battery materials, in particular, the invention relates to a system for preparing lithium hydroxide monohydrate. Background technique [0002] Lithium hydroxide is mainly used in chemical raw materials, battery industry, chemicals, aerospace, atomic energy, etc. With the rapid expansion of the new energy automobile industry, the rapid development of the battery industry and battery material industry has been driven. Tesla system, lithium titanate, a new negative electrode material, and high-nickel ternary materials have a strong demand for lithium hydroxide, which makes the demand for lithium hydroxide in the battery material market explode. The requirements of early lithium battery materials for lithium hydroxide are mainly reflected in uniform physical appearance, low chemical impurities, and good batch stability. However, with the development of the lithium battery industry, the above-mentioned performance req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02
CPCC01D15/02
Inventor 唐建文杜国山羡鹏飞周文龙汪德华徐月和
Owner CHINA ENFI ENGINEERING CORPORATION
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