Producing process of battery-level lithium hydroxide

A lithium hydroxide and production process technology, applied in the direction of lithium oxide;/hydroxide, battery electrodes, circuits, etc., can solve the problems of complex process flow, large amount of by-products, difficult to filter, etc., and achieve high product purity, The effect of fewer by-products and simple production process

Active Publication Date: 2017-08-18
CHENGDU CHEMPHYS CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method for industrial-scale production is that the obtained aluminum-lithium precipitate is colloid, and the solid weight only accounts for about 10%, and the average particle size is only 1 micron, which is not easy to filter, and the process is complicated and energy consumption is high.
[0012] In summary, the above-mentioned first-stage lithium hydroxide production process has a long process and requires multiple purifications to meet the quality requirements of battery-grade lithium hydroxide. At the same time, the amount of by-products is large and difficult to handle.

Method used

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  • Producing process of battery-level lithium hydroxide
  • Producing process of battery-level lithium hydroxide
  • Producing process of battery-level lithium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Put 2kg of industrial-grade lithium carbonate with a particle size of 5-7μm into a plasma decomposition furnace with a temperature of 1600°C and a pressure of 2000Pa in the furnace through nitrogen atomization for decomposition. The residence time is 0.005h, and 1kg of decomposition products are obtained. The lithium content is 74.5%, and the decomposition rate is 92%.

[0074] Dissolve the above decomposition products in pure water at 30°C while stirring at a solid-to-liquid mass ratio of 1:10, react for 0.5 hours, and the temperature of the solution rises to 85°C.

[0075] The solution obtained by dissolving is filtered while it is hot, and the filter residue is washed with a small amount of pure water to obtain filtered and refined lithium hydroxide solution and filter residue.

[0076] Evaporate and crystallize the lithium hydroxide solution obtained by filtration, control the solid content of the evaporated magma to 5%, then cool to 35°C, centrifuge, and rinse with...

Embodiment 2

[0079] 3 kg of industrial-grade lithium carbonate with a particle size of 90-100 μm was loaded into a plasma decomposition furnace with a temperature of 1500 ° C and a pressure of 1500 Pa in the furnace through nitrogen atomization for decomposition. The residence time was 0.01 h, and 1.46 kg of decomposition products were obtained. The lithium oxide content in the product is 66.5%, and the decomposition rate is 80%.

[0080] The above decomposition products were dissolved in pure water at 40°C while stirring at a solid-to-liquid mass ratio of 0.8:10, and reacted for 1.0 hour, and the temperature of the solution rose to 95°C.

[0081] The solution obtained by dissolving is filtered while it is hot, and the filter residue is washed with a small amount of pure water to obtain the filtered lithium hydroxide solution and filter residue.

[0082] Evaporate and crystallize the lithium hydroxide solution obtained by filtration, the solid content of the crystal slurry is 7%, stop the ...

Embodiment 3

[0085] 2kg of industrial-grade lithium sulfate with a particle size of 45-100μm was decomposed by nitrogen atomization into a plasma decomposition furnace with a loading temperature of 1600°C and a furnace pressure of 1000Pa. The residence time was 0.02h, and 0.6kg of decomposition products were obtained. The content of lithium oxide in the product was 80% %, the decomposition rate is 88%.

[0086]The above decomposition products were dissolved in pure water at 30°C while stirring at a solid-to-liquid mass ratio of 0.8:10, and reacted for 1.0 hour, and the temperature of the solution rose to 86°C.

[0087] The solution obtained by dissolving is filtered while it is hot, and the filter residue is washed with a small amount of pure water to obtain pure lithium hydroxide solution and filter residue.

[0088] Evaporate and crystallize the filtered lithium hydroxide solution, stop concentrating the magma with a solid content of 5%, cool to 40°C, centrifuge, and rinse with pure wate...

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Abstract

The invention provides a producing process of battery-level lithium hydroxide, and belongs to the technical field of lithium hydroxide. The producing process includes the steps that A, a lithium-containing compound is placed into a decomposing furnace to be decomposed; B, the product obtained in the step A and water react to generate a lithium hydroxide solution; C, the lithium hydroxide solution obtained in the step B is filtered; D, the filter liquor obtained in the step C is evaporated, concentrated and crystallized until the solid content is 5-10%, and crystal is cooled; E, solid-liquid separation and washing are carried out on the crystal slurry obtained in the step D; F, the lithium hydroxide crystal obtained in the step E is dried to obtain the battery-level lithium hydroxide. The lithium-containing compound is decomposed first and reacts with the water solution to generate lithium hydroxide, the raw material comprises the lithium-containing compound only, and introduction of impurities such as calcium and magnesium is reduced; the lithium hydroxide solution formed by lithium oxide dissolution approaches saturation, energy consumption for follow-up evaporation and concentration is low, and production cost is effectively reduced; side reaction is avoided, the lithium yield is high, the obtained product is high in purity and quality.

Description

technical field [0001] The invention belongs to the technical field of lithium hydroxide, in particular to a production process of lithium hydroxide, in particular to a production process of battery-grade lithium hydroxide. Background technique [0002] Lithium resources come from spodumene, lepidolite and other ore resources and salt lake brine resources, and there are different production methods according to their characteristics. At present, manufacturers of industrial-grade and battery-grade lithium hydroxide in batches are mainly located in China and South America (Chile, Argentina), and the technologies adopted mainly include the following two routes: [0003] 1) Production of lithium hydroxide with ore as raw material. [0004] ① Limestone roasting method. The lithium-containing ore (spodumene or lepidolite) is mixed with lime or limestone according to a certain mass ratio and finely ground. Then the ground material is sent to the rotary kiln for calcination, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02H01M4/48
CPCC01D15/02C01P2006/80H01M4/48Y02E60/10
Inventor 班文俊蔡荣富
Owner CHENGDU CHEMPHYS CHEM IND
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