Method for composite production of high-purity lithium hydroxide monohydrate, high-purity lithium carbonate and battery grade lithium carbonate

A technology of lithium hydroxide monohydrate and high-purity lithium carbonate, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, carbonate preparations, etc., can solve the problems affecting yield, low reaction speed, and utilization rate Low-level problems, to achieve the effect of low equipment investment, low cost, and high recovery rate

Active Publication Date: 2017-01-11
CHENGDU CHEMPHYS CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Using high-purity LiOH and CO 2 Reaction in water, precipitation to prepare high-purity Li 2 CO 3 , the method temperature control is very critic

Method used

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  • Method for composite production of high-purity lithium hydroxide monohydrate, high-purity lithium carbonate and battery grade lithium carbonate
  • Method for composite production of high-purity lithium hydroxide monohydrate, high-purity lithium carbonate and battery grade lithium carbonate
  • Method for composite production of high-purity lithium hydroxide monohydrate, high-purity lithium carbonate and battery grade lithium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Dissolve industrial-grade lithium hydroxide monohydrate in deionized water at 80°C to prepare a first solution with a LiOH concentration of 160g / L; add 0.5% of lithium hydroxide input into the first solution prepared above The first impurity remover, oxalic acid, was incubated and reacted for 15 minutes, then filtered, the filtrate was pumped into the crystallizer, and high-purity lithium hydroxide monohydrate crystals with 10% lithium hydroxide mass were added, cooled and crystallized, and solid-liquid separation was carried out when the solution temperature dropped to 50°C , the obtained solid is rinsed with 15% pure water of lithium hydroxide mass to obtain high-purity lithium hydroxide monohydrate wet material and crystallization mother liquor; part of the high-purity lithium hydroxide monohydrate wet material is dried and sieved Finally, high-purity monohydrate lithium hydroxide product is obtained.

[0069] In a stainless steel carbonization reaction kettle, the h...

Embodiment 2

[0072] Dissolve industrial-grade lithium hydroxide monohydrate in deionized water at 90°C to prepare a first solution with a LiOH concentration of 165g / L; add 0.8% of the mass of lithium hydroxide to the first solution prepared above and wherein The first impurity remover with a mass ratio of oxalic acid to EDTA of 2:1, heat preservation reaction for 15 minutes and then filter, the filtrate enters the crystallizer, add high-purity lithium hydroxide monohydrate wet material with 20% lithium hydroxide mass, cool and crystallize, when the solution When the temperature drops to 45°C, solid-liquid separation is carried out, and the obtained solid is rinsed with 20% pure water of lithium hydroxide mass to obtain high-purity lithium hydroxide monohydrate wet material and crystallization mother liquor; high-purity lithium hydroxide monohydrate wet material After drying and sieving, a high-purity lithium hydroxide monohydrate product is obtained.

[0073] Dissolve the high-purity monoh...

Embodiment 3

[0076]Dissolve industrial-grade lithium hydroxide monohydrate in deionized water at 100°C to prepare a first solution with a LiOH concentration of 170g / L; add 1% of the mass of lithium hydroxide and lithium oxalate The first impurity remover with a mass ratio of 1:1 to EDTA was kept and reacted for 20 minutes, then filtered, the filtrate was pumped into a crystallizer, and high-purity lithium hydroxide monohydrate wet material with a mass of lithium hydroxide of 30% was added, cooled and crystallized. When the temperature of the solution drops to 40°C, solid-liquid separation is carried out and the resulting solid is rinsed with 30% pure water of lithium hydroxide mass to obtain high-purity monohydrate lithium hydroxide wet material and crystallization mother liquor; high-purity monohydrate hydrogen Lithium oxide wet material is dried and sieved to obtain high-purity lithium hydroxide monohydrate product.

[0077] Dissolve the high-purity lithium hydroxide monohydrate wet mate...

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Abstract

The invention discloses a method for composite production of high-purity lithium hydroxide monohydrate, high-purity lithium carbonate and battery grade lithium carbonate. Industrial grade lithium hydroxide is dissolved into pure water or crystallization mother liquor, and a first solution is prepared; a first impurity removal agent is added into the first solution, then filtering is performed, a lithium hydroxide crystal is added into a filtrate, cooling crystallization is performed, solid-liquid separation is performed to obtain a high-purity lithium hydroxide monohydrate wet material and crystallization mother liquor; the high-purity lithium hydroxide monohydrate wet material is dissolved into pure water or carbonization mother liquor, and a second solution is prepared; carbon dioxide is introduced into the second solution to perform primary carbonization, and solid-liquid separation is performed to obtain a lithium carbonate wet material and a filtrate; a second impurity removal agent is added into the filtrate, after a heat preservation reaction is performed, carbon dioxide is introduced to perform secondary carbonization, then, introduction of the carbon dioxide is stopped, the reaction continues to be performed, then, solid-liquid separation is performed, obtained solids are washed, a high-purity lithium carbonate wet material and carbonization mother liquor are obtained, and after the high-purity lithium carbonate wet material is post-processed, a high-purity lithium carbonate product is obtained.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium salt materials, more specifically, relates to a method for producing high-purity lithium hydroxide monohydrate, high-purity lithium carbonate and battery-grade lithium carbonate by compounding industrial-grade lithium hydroxide monohydrate. Background technique [0002] High-purity lithium hydroxide monohydrate is an important raw material for high-nickel ternary, NCA cathode materials and electrolyte additives for lithium-ion batteries. High-purity lithium carbonate is an important raw material for electrolyte lithium hexafluorophosphate, electronic single crystal materials lithium niobate, lithium tantalate, and X-ray fluorescence analysis key material lithium borate. [0003] At present, there are few reports on the large-scale production technology of high-purity lithium hydroxide monohydrate at home and abroad. The mass production is mainly industrial-grade and battery-grade li...

Claims

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Application Information

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IPC IPC(8): C01D1/30C01D1/32C01D7/07C01D7/22
CPCC01D1/30C01D1/32C01D7/07C01D7/22C01P2006/80
Inventor 蔡荣富班文俊孟强郑传勇蒋红军
Owner CHENGDU CHEMPHYS CHEM IND
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