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Method for removing impurities SiO2 and Al2O3 and purifying graphite

A technology for graphite and impurities, applied in the field of removing impurities SiO2 and Al2O3 to purify graphite, can solve the problems of poor impurity removal effect and high energy consumption, and achieve the effects of low environmental pollution, low energy consumption and short process flow

Inactive Publication Date: 2015-02-11
QINGDAO GUANGXING ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These production methods have more or less shortcomings such as poor impurity removal effect, high energy consumption, and serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Get carbon content>65% graphite 500kg, put into reactor I, adopt pressurized alkali leaching and normal pressure acid leaching to handle graphite earlier, used LiCO 3 Concentration is 10%, KOH concentration is 6%, NaHCO 3 The concentration is 7%; the weight-liquid-solid ratio of reaction-controlled pressurized alkaline leaching is 1-9:1, the temperature is 150°C, and the treatment time is 1 hour; lime is used as a reagent to recover and regenerate alkali liquor. The reacted material was separated from solid and liquid, and washed with pure water until pH = 7. Among them, atmospheric pressure acid leaching is carried out under the ultrasonic field; the treated graphite powder is then leached by adding 21% sulfuric acid and 13% hydrofluoric acid according to the weight percentage of graphite, and the weight-liquid-solid ratio of atmospheric pressure acid leaching is controlled to be 1 ~ 9:1, the temperature is 35, and the processing time is 2h. Ultrasonic frequency ra...

Embodiment 2

[0017] Get carbon content>65% graphite 600kg, put into reaction kettle I, adopt pressurized alkali leaching and normal pressure acid leaching to handle graphite earlier, used LiCO 3 Concentration is 35%, KOH concentration is 30%, NaHCO 3 The concentration is 28%; the weight-liquid-solid ratio of pressurized alkaline leaching is controlled to be 1-9:1, the temperature is 280°C, and the treatment time is 11 hours; lime is used as a reagent to recover and regenerate alkali liquor. Among them, the acid leaching under normal pressure is carried out under the microwave field, and the treated graphite powder is leached by adding 24% sulfuric acid and 28% hydrofluoric acid according to the weight percentage of graphite, and the weight-liquid-solid ratio of acid leaching under normal pressure is controlled to be 1-9 : 1, the temperature is 85°C, and the treatment time is 90h. Obtain high-purity graphite products. The frequency range of the microwave field is controlled at 280GHz du...

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Abstract

The present invention provides a method for removing impurities SiO2 and Al2O3 and purifying graphite, wherein impurities in the graphite can be effectively removed through the method, the graphite is adopted as a raw material, the residual SiO2 content in the purified graphite is less than or equal to 30 MG / L, the residual Al2O3 content in the purified graphite is less than or equal to 0.3%, and the purity is more than 99.99%. According to the method, graphite with the carbon content of more than 65% is taken and placed into a reaction kettle I, pressurization alkali leaching and normal pressure acid leaching are adopted to treat the graphite, the concentration of the used LiCO3 is 10-35%, the concentration of the KOH is 6-30%, the concentration of the NaHCO3 is 7-28%, the normal pressure acid leaching is performed under the ultrasonic wave field or / and the microwave field, 21-24% (calculated as the weight of the graphite) by weight of sulfuric acid and 13-28% (calculated as the weight of the graphite) by weight of hydrofluoric acid are added to the treated graphite powder to carry out leaching, the obtained mixture is added to a reaction kettle, stirring heating is performed, cerium carbonate is added, an oxidizing agent is added slowly, and stirring, heating boiling, standing clarification and filtration are performed so as to obtain the high purity graphite with no silicon and aluminum impurities.

Description

technical field [0001] The invention relates to a method for removing impurity SiO 2 and Al 2 o 3 A method for purifying graphite, a method for purifying high-purity graphite with a purity greater than 99.99%. Background technique [0002] High-purity graphite is graphite with a graphite content of more than 99.99%. It is a non-renewable strategic resource and has always been an indispensable resource for military industry, modern technology and high-tech development. [0003] At present, the production methods of high-purity graphite are mainly wet purification methods based on flotation, acid-base method, and hydrofluoric acid method, and fire purification methods based on chlorination roasting method and high-temperature method. These production methods more or less have the disadvantages of poor impurity removal effect, high energy consumption, and serious environmental pollution. Impurity SiO in graphite 2 and Al 2 o 3 Is the most common, how to completely remove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 王志敏刘天云
Owner QINGDAO GUANGXING ELECTRONICS MATERIALS