Battery-grade lithium hydroxide monohydrate production process applying novel combined calcium removal

A monohydrate lithium hydroxide, production process technology, applied in the direction of lithium oxide;/hydroxide, sulfate/bisulfate preparation, alkali metal sulfite/sulfate dehydration, etc., can solve the problem of calcium content, Affect the decalcification process, the effect of decalcification is poor, etc., to achieve the effect of reducing the content of calcium salt

Pending Publication Date: 2020-04-03
广西雅保锂业有限公司
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Problems solved by technology

[0003] At present, the production of battery-grade lithium hydroxide monohydrate mainly uses spodumene as raw material, and adopts limestone roasting method or lithium sulfate caustic cooling crystallization method. In the preparation process of lithium sulfate caustic cooling crystallization method, calcium salt needs to be added. Calcium salt not only increases the amount of calcium salt used, affects the subsequent decalcification process, resulting in poor decalcification effect, but also affects the calcium content in the final product, reducing the grade of the product

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  • Battery-grade lithium hydroxide monohydrate production process applying novel combined calcium removal

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Embodiment 1

[0020] Such as figure 1 As shown, the present invention applies the battery-grade monohydrate lithium hydroxide production process of novel joint descaling, comprising the following steps: (1) spodumene is sequentially calcined, cooled, finely ground, acid reaction, and the After the product is cooled to 80°C, it is adjusted into a slurry with water, and the solid content of the slurry is 60%;

[0021] (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 55%. The temperature in the leaching tank is 50°C and pH=5. Afterwards, use a filter press to filter and use tap water Or the filter cake is rinsed with process water, and the filter cake is purged with compressed air so that the water content of the filter cake is 20%, and the rinse water is returned to step (1) for pulping, and the filtered clear liquid is purified with an alkaline solution. Adjust the pH value to 12, and remove the imp...

Embodiment 2

[0028] The production process of battery-grade lithium hydroxide monohydrate using a new type of joint decalcification includes the following steps:

[0029] (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 mixed with water to form a slurry with a solid content of 70%;

[0030] (2) Add calcium salt to the above slurry and stir for leaching, the calcium salt is adjusted to slurry with water, the solid content is 50%, the temperature in the leaching tank is 60 ° C, pH = 7, and then use a filter press to filter and use tap water Or the filter cake is rinsed with process water, and the filter cake is purged with compressed air to make the water content of the filter cake = 15%, and the rinse water is returned to step (1) for pulping, and the filtered clear liquid is purified with lithium hydroxide solution , adjust the pH value to 10, and remove the impurity iron, manganes...

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Abstract

The invention discloses a battery-grade lithium hydroxide monohydrate production process applying novel combined calcium removal. The battery-grade lithium hydroxide monohydrate production process comprises the following steps: (1) sequentially calcining, cooling, and finely grinding spodumene, adding an acid for reaction, and then, carrying out size mixing; 2) adding a calcium salt into an obtained slurry, stirring and leaching; 3) filtering an obtained filtered clear liquid again, and purifying the filtered clear liquid by using an alkaline solution; 4, filtering a solution obtained throughcausticization in the former step; 5) freezing a filtered causticized solution in a refrigeration workshop to separate out sodium sulfate decahydrate and a lithium hydroxide solution; and 6) evaporating, concentrating and purifying sodium sulfate decahydrate. The production process can reduce calcium using amount effectively, is excellent in calcium removing effect, and can reduce product calciumcontent.

Description

technical field [0001] The invention relates to the technical field of lithium hydroxide production, in particular to a production process for battery-grade lithium hydroxide monohydrate using a novel joint decalcification. Background technique [0002] Lithium hydroxide is widely used in chemical raw materials, battery industry, metallurgy, 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. Battery-grade lithium hydroxide monohydrate is the core raw material for the production of ternary lithium battery cathode materials. The scope of application of lithium hydroxide will be further expanded. [0003] At present, the production of battery-grade lithium hydroxide monohydrate mainly uses spodumene as raw material, and adopts limestone roasting method or lithium sulfate caustic cooling crystallization method. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01D5/06C01D5/18
CPCC01D15/02C01D5/06C01D5/18
Inventor 何开茂何东利伍震洲汪梨超吴金友胡见平谭培渊
Owner 广西雅保锂业有限公司
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