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Preparation method of battery grade lithium hydroxide

A lithium hydroxide, battery-grade technology, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problems of high chlorine content, low purity of lithium hydroxide and high preparation cost

Active Publication Date: 2021-10-08
中化国际新材料(河北)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The main purpose of the present invention is to provide a method for preparing battery-grade lithium hydroxide, so as to solve the problems of low purity of lithium hydroxide, high chlorine content or high preparation cost when preparing battery-grade lithium hydroxide in the prior art

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  • Preparation method of battery grade lithium hydroxide

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preparation example Construction

[0032] In order to solve the above problems, the invention provides a method for preparing battery-grade lithium hydroxide, such as figure 1 As shown, it includes the following steps: S1, reacting lithium chloride-containing brine and lye to precipitate lithium to obtain crude lithium hydroxide and lithium precipitation mother liquor; S2, washing and evaporating the crude lithium hydroxide for the first time in sequence Crystallization, second washing, and drying to obtain battery-grade lithium hydroxide.

[0033] In the above step S1, a mixed solution of lithium hydroxide and chloride (such as sodium chloride or potassium chloride) can be obtained by causticizing brine. In this step, since the solubility of lithium hydroxide and these chloride impurities is very close, and the solubility varies little with temperature, if lithium hydroxide monohydrate is directly crystallized by evaporation, there will also be a large amount of chlorine in the process. Compounds will be prec...

Embodiment 1

[0048] Process such as figure 1 Shown:

[0049] Take 1m 3 Lithium content is 20g / L refined bittern, be concentrated to lithium content and be 44.5g / L (conversion LiCl mass concentration is about 27%), add 443kg mass concentration therein and be about 25.8% sodium hydroxide solution (hydroxide Root ion mass concentration is 10.9%), react at room temperature for 60min, form a solid-liquid mixture containing lithium hydroxide precipitation, filter the slurry, wash with saturated lithium hydroxide solution to remove a large amount of sodium chloride impurities entrained in the filter cake, and obtain Lithium hydroxide filter cake; under heating conditions, use 300kg deionized water to completely dissolve the lithium hydroxide filter cake, heat and evaporate 2 / 3 of the water, and carry out cooling and crystallization. Control the crystallization temperature at 60°C and the pressure at 0.01MPa. Filter to obtain a lithium hydroxide filter cake with a chlorine content of 150ppm; was...

Embodiment 2

[0053] Process such as figure 1 Shown:

[0054] Take 1m 3 Lithium content is 20g / L refined bittern, be concentrated to lithium content and be 44.5g / L (conversion LiCl mass concentration is about 27%), add 443kg mass concentration therein and be about 25.8% sodium hydroxide solution (hydroxide Root ion mass concentration is 10.9%), reacted at 80°C for 120min to form a solid-liquid mixture containing lithium hydroxide precipitates, filtered the slurry, and washed with saturated lithium hydroxide solution to remove a large amount of sodium chloride entrained in the filter cake Impurities, to obtain lithium hydroxide filter cake; under heating conditions, use 300kg deionized water to completely dissolve the lithium hydroxide filter cake, heat to evaporate 2 / 3 of the water, and carry out cooling and crystallization. The crystallization temperature is controlled at 80°C and the pressure is at 0.02MPa, filtered to obtain a lithium hydroxide filter cake with a chlorine content of 18...

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Abstract

The invention provides a method for preparing battery-grade lithium hydroxide, which comprises the following steps: S1, reacting lithium chloride-containing brine and lye to precipitate lithium to obtain lithium hydroxide crude product and lithium sinking mother liquor; S2, The crude lithium hydroxide is washed in sequence for the first time, evaporated and crystallized, washed for the second time, and dried to obtain battery-grade lithium hydroxide. The method provided by the invention can prepare battery-grade lithium hydroxide with satisfactory purity, especially low content of chloride ions. At the same time, the invention has the advantages of high lithium recovery rate, short process, simple process, low cost, safety and environmental protection, and easy industrial production.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a method for preparing battery-grade lithium hydroxide. Background technique [0002] At present, the methods for preparing lithium hydroxide from lithium chloride mainly include the following: [0003] (1) Lithium carbonate causticization method [0004] Add sodium carbonate to the lithium chloride solution to precipitate lithium carbonate; then mix milk of lime and lithium carbonate to adjust a certain concentration of causticizing solution, heat to boiling and stir vigorously, the causticizing reaction is as follows [0005] Ca(OH) 2 +Li 2 CO 3 =CaCO 3 +2LiOH.H 2 o [0006] The reaction can obtain a lithium hydroxide solution with a concentration of about 3.5%, and remove the insoluble residue (mainly CaCO 3 ), after separation, the mother liquor is concentrated under reduced pressure, crystallized, and dried to obtain lithium hydroxide product. This process is rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02
CPCC01D15/02
Inventor 孙学政宋楠楠王力伟顾志强吴恒喜
Owner 中化国际新材料(河北)有限公司