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Method for preparing sheet high-purity lithium hydroxide by using spodumene concentrate

A spodumene concentrate, lithium hydroxide technology, applied in the direction of lithium oxide;/hydroxide, can solve the problems of unsatisfactory crystal particle size distribution, low degree of automation, low light transmittance, etc., and achieve particle distribution Narrow and easy to control, improve labor efficiency, stable product quality

Active Publication Date: 2014-08-27
SICHUAN GUORUN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the national standard GB / T26008-2010, battery grade LiOH.H 2 The minimum purity of O is not less than 95%, and the above-mentioned process can meet the national standard, but the traditional process generally has a long process flow, selectivity to raw materials, low comprehensive recovery rate, low yield, not higher than 90%, and large water consumption , the particles are spherical, in order to increase the yield, the water has to have an open circuit, causing pollution, low equipment production capacity, high energy consumption, low degree of automation, especially the product purity is not high, the light transmittance is low, and the light transmittance does not exceed 90%, the crystal particle size distribution is not ideal, and problems such as flaky crystals cannot be produced

Method used

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  • Method for preparing sheet high-purity lithium hydroxide by using spodumene concentrate
  • Method for preparing sheet high-purity lithium hydroxide by using spodumene concentrate
  • Method for preparing sheet high-purity lithium hydroxide by using spodumene concentrate

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Effect test

Embodiment 1

[0030] A spodumene concentrate in China, Li in the concentrate 2 The mass percentage content of O is 5.2%, and the spodumene concentrate is ground, when the particle size above -200 mesh accounts for 80% of the total content, and the Li-containing recovered from the kiln head 2O dust is mixed and added from the kiln head, and the -200 mesh coal powder is sprayed into the burning rotary kiln by a controllable movable coal injection pipe at the kiln tail. The temperature in the high temperature zone of the rotary kiln is controlled at 950°C, and the length of the high temperature zone is controlled At 12m, the residence time in the high temperature zone is 22min. The calcined material from the kiln tail is cooled to 40°C, and then enters the ball mill for ball milling to -200 mesh to reach 80% of the total mass content. The whole process is automatically controlled.

[0031] The finely ground ore containing βLi is mixed with anthracic sulfuric acid. The added mass of sulfuric ac...

Embodiment 2

[0039] Overseas Australian mine spodumene concentrate, of which Li 2 The mass percent content of O is 6.13%, and the spodumene concentrate is ground to -180 mesh to reach more than 80% of the total content, and the recovery rate of Li from the kiln head 2 The dust mixed with O is fed from the kiln head by the screw feeder, and the coal powder pulverized to -200 mesh is sprayed into the burning rotary kiln by the controllable moving coal injection pipe at the kiln tail. The temperature in the high temperature zone is 1100 °C , the length of the high-temperature zone is controlled at 13.5M, the residence time of the material in the high-temperature zone is 25min, the calcined material from the kiln tail is cooled to <40°C, and then enters the ball mill for ball milling to -200 mesh to reach about 80% of the total content. All automatic control.

[0040] The finely ground minerals containing βli are mixed with anthracite sulfuric acid. The amount of sulfuric acid added is Wt135%...

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Abstract

The invention relates to the preparation of high-purity compounds in the technical field of chemical engineering, and particularly relates to a method for preparing sheet high-purity lithium hydroxide by using spodumene concentrate. The method comprises the steps of dissolving the obtained crude product of the lithium hydroxide monohydrate to ensure that the mass concentration of Li2O is 65-70g / L, carrying out concentration and crystallization by using an organic solvent and finally carrying out solid-liquid separation and drying to obtain the sheet high-purity lithium hydroxide. The method can be used for treating different types of minerals; the hydration reaction of the organic solvent plays a role in concentration to ensure that the lithium hydroxide is separated out more easily and more quickly and the impurities are not crystallized along with the lithium hydroxide, so that the purity of the lithium hydroxide is improved, the purity is above 99.8% and the light transmittance is up to 99%. The crystallized particles are narrow in distribution and easy to control; the product quality is stable and exceeds the international electronic-grade standard; and the crystal is sheet; the organic solvent is convenient for repeated application; the operation is carried out at normal temperature so that the energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of preparation of high-purity compounds in the technical field of chemical industry, in particular to a preparation method for preparing sheet-shaped high-purity lithium hydroxide from spodumene concentrate. Background technique [0002] Lithium hydroxide monohydrate is a white crystalline powder, soluble in water, slightly soluble in organic solvents such as alcohol. It can absorb carbon dioxide from the air and deteriorate. It is strongly alkaline. It will not burn, but it is highly corrosive. Usually in the form of monohydrate. At present, it has a wide range of uses, and is widely used in chemical industry, national defense, electronics and other fields. The traditional method of producing lithium hydroxide monohydrate is to use spodumene as raw material, transform through high-temperature calcination, sulphate roasting, freeze and separate sodium sulfate, evaporate and low-temperature recrystallization to prod...

Claims

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Application Information

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IPC IPC(8): C01D15/02
Inventor 邓智林严显伟
Owner SICHUAN GUORUN NEW MATERIAL
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