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Method for preparing high pure graphite with steam heating

A technology of high-purity graphite and steam, which is applied in the field of graphite purification technology, can solve the problems of low production cost, high production cost and complicated equipment, and achieve the effect of low cost, convenient operation and simple equipment

Inactive Publication Date: 2009-02-18
QINGDAO HENSEN GRAPHITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the existing graphite purification method, such as complex process, large energy consumption, complex equipment, and high production cost, and proposes a method for preparing high-purity graphite by steam heating, which does not require the use of electric Heating, low energy consumption, low production cost, short process, simple equipment, easy operation, and fixed carbon content can reach 99.9%-99.995%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1500kg of natural graphite into the PP reaction tank, and its carbon content is 90%. At the same time, add 400kg of hydrofluoric acid with a concentration of 40%, 300kg of hydrochloric acid solution with a concentration of 30%, and sulfuric acid with a concentration of 98% into the PP reaction tank. 150kg of solution and 100kg of nitric acid solution with a concentration of 40%, add an appropriate amount of water about 400kg to stir the proportional material in the PP reaction tank, and stir for about 15 minutes to make the proportional material in the reaction tank stir evenly. Then put steam into the PP reaction tank and seal it. The reaction tank is heated by steam, and the proportioned material is reacted at 60°C for 24 hours. During the reaction, it is stirred every 30 minutes, and each time it is stirred for 5-10 minutes. When the graphite reacts with the acid solution for about 22 hours, add 200 kg of oxidant ammonium difluoride to the reacting material, and ...

Embodiment 2

[0021] Adding 1500kg of natural graphite with a carbon content of 90% in the PP reaction tank, and adding 450 kg of hydrofluoric acid with a concentration of 40% and 400 kg of hydrochloric acid solution with a concentration of 30% in the PP reaction tank at the same time 200kg of 98% sulfuric acid solution and 120kg of nitric acid solution with a concentration of 40%, add an appropriate amount of water about 400kg to stir the proportional material in the PP reaction tank, and stir for about 15 minutes to make the proportional material in the reaction tank stir evenly. Then put steam into the PP reaction tank and seal it. The reaction tank is heated by steam, and the proportion material is reacted at 100°C for 20 hours. During the reaction, it is stirred every 30 minutes, and each time it is stirred for 5-10 minutes. When the graphite reacts with the acid solution for about 18 hours, add 300 kg of oxidant ammonium difluoride to the reacting material and continue stirring. Afte...

Embodiment 3

[0024] Add 1500kg of natural graphite with a carbon content of 95% in the PP reaction tank, and add 500 kg of hydrofluoric acid with a concentration of 40% and 500 kg of hydrochloric acid solution with a concentration of 30% in the PP reaction tank at the same time. 300kg of 98% sulfuric acid solution and 160kg of 40% nitric acid solution, add an appropriate amount of water about 300kg and stir the proportional material in the PP reaction tank for about 25 minutes to make the materials in the reaction tank evenly stirred. Then put steam into the PP reaction tank and seal it. The reaction tank is heated by steam, and the proportional material is reacted at 80°C for 20 hours. During the reaction, it is stirred every 30 minutes, and each time it is stirred for 5-10 minutes. When the graphite reacts with the acid solution for about 18 hours, add 300 kg of oxidant ammonium difluoride to the reacting material and continue stirring. After the reaction, the material is put into the P...

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Abstract

The invention relates to a graphite purifying craftwork, in particular relates to a method for purifying the natural graphite with the heating of the vapor, which overcomes the weaknesses of the prior graphite purifying method that the craftwork is complicated, the energy consumption is large, the adopted devices are complicated, and the production cost is high, so that a method adopting the heating of the vapor to purify the graphite is provided. Through the heating of the vapor, the acid solution is reacted with the foreign matters in the graphite, and the foreign matters in the graphite are removed through the procedures such as washing, mixing, spin-dry, drying and the like. The method has low production cost, short flowing procedures, simple device and convenient operation; the content of the fixed carbon in the graphite that is purified can reach 99.99 percent to 99.995 percent.

Description

technical field [0001] The invention relates to a graphite purification process, in particular to a method for purifying natural graphite by steam heating. Background technique [0002] As an industrial raw material, graphite plays an important role in some special industries or high-tech fields, such as atomic energy industry, automobile industry, aerospace technology, biotechnology and other industries. The graphite used in these industries must have a carbon content of more than 99.9%. High-purity graphite, and the carbon content of natural graphite after general beneficiation can only reach 96%, which is far from meeting the requirements of the high-purity graphite industry. Therefore, natural graphite must be purified. [0003] At present, the commonly used purification method of natural graphite is to use high-temperature electrothermal method to improve the purity of graphite. The high-temperature electrothermal method is to use the high-temperature resistance of grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 莫海波
Owner QINGDAO HENSEN GRAPHITE
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