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Method for purifying graphite powder and high-purity graphite powder prepared by the method

A graphite powder, high temperature technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of inconvenient popularization and application, inability to melt graphite impurities, unfavorable popularization and application, etc., to shorten the time for impurity removal, speed up Melting or vaporizing, improving the effect of purification

Active Publication Date: 2017-11-07
陕西六元碳晶科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ordinary high-temperature method requires high energy consumption during production, and high temperatures above 3000 ° C are required to obtain graphite with high purity. However, such a high calcination temperature is required, which will undoubtedly increase the input cost of heating equipment, which is not convenient for popularization and application.
Moreover, the maximum temperature that the general furnace can heat is limited, and it cannot completely melt the impurities in graphite as much as possible.
[0004] To sum up, the chemical purification method has relatively low equipment requirements, but it is easy to introduce impurities and is not conducive to environmental protection. However, the high-temperature purification in the prior art can obtain graphite with high purity, but it has high equipment requirements. Thereby the investment cost of production has been increased, which is not conducive to popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The finished graphite powder with a carbon content of 98% and a particle size of 10 μm-80 μm is selected for purification.

[0037]First, put an appropriate amount of graphite powder to be purified into an isostatic graphite crucible, and place it in a high-temperature closed kiln for calcination. Seal the high-temperature airtight kiln well to ensure that there will be no air leakage in the high-temperature airtight kiln. Then, the high-temperature closed kiln is evacuated by a vacuum pump connected with the high-temperature closed kiln, so that the pressure in the high-temperature kiln is 200 Pa. The calcination temperature of the high-temperature kiln was set at 2000° C., and the heating rate was 10° C. / min. Then, inert gas is filled into the high-temperature airtight kiln, and nitrogen is selected as the protective atmosphere in this embodiment. The amount of inert gas charged is controlled so that the air pressure in the high-temperature airtight kiln is lower th...

Embodiment 2

[0049] The finished graphite powder with a carbon content of 98.6% and a particle size of 80 μm-120 μm is selected for purification.

[0050] First, put an appropriate amount of graphite powder to be purified into an isostatic graphite crucible, and place it in a high-temperature closed kiln for calcination. Seal the high-temperature airtight kiln well to ensure that there will be no air leakage in the high-temperature airtight kiln. Then, the high-temperature closed kiln is evacuated by a vacuum pump connected with the high-temperature closed kiln, so that the pressure in the high-temperature kiln is 1000Pa. The calcination temperature of the high-temperature kiln was set at 2400° C., and the heating rate was 18° C. / min. Then, inert gas is filled into the high-temperature airtight kiln, and argon is selected as the protective atmosphere in this embodiment. The amount of inert gas charged is controlled so that the air pressure in the high-temperature airtight kiln is lower t...

Embodiment 3

[0062] The finished graphite powder with a carbon content of 99% and a particle size of 120 μm-200 μm is selected for purification.

[0063] First, put an appropriate amount of graphite powder to be purified into an isostatic graphite crucible, and place it in a high-temperature closed kiln for calcination. Seal the high-temperature airtight kiln well to ensure that there will be no air leakage in the high-temperature airtight kiln. Then, the high-temperature closed kiln is evacuated by a vacuum pump connected with the high-temperature closed kiln, so that the pressure in the high-temperature kiln is 1800Pa. The calcination temperature of the high-temperature kiln was set at 2800° C., and the heating rate was 25° C. / min. Then, inert gas is filled into the high-temperature airtight kiln, and helium is selected as the protective atmosphere in this embodiment. The amount of inert gas charged is controlled so that the air pressure in the high-temperature airtight kiln is lower t...

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Abstract

The invention provides a graphite powder purification method. The method comprises the following steps: graphite powder to be purified is placed into a high-temperature sealed kiln and undergoes vacuum calcination in the atmosphere of protective gas; when the calcination temperature reaches 2,000-3,000 DEG C, multiple pneumatic control variation steps are carried out to control periodic pulsative oscillation change of air pressure in the high-temperature sealed kiln. Each pneumatic control variation step contains a gas withdrawal step and a gas injection step. For 1-3 h of each pneumatic control variation step, range of pressure change in the high-temperature sealed kiln is controlled to 1-10 kPa. According to the invention, the graphite powder with high carbon content can be obtained under the condition of low calcination temperature. The preparation process is simple, and the requirement on equipment is low.

Description

technical field [0001] The invention relates to the technical field of high-temperature purification powder, in particular to a method for purifying graphite powder and the high-purity graphite powder prepared by the method. Background technique [0002] Graphite has many advantages such as low density, corrosion resistance, radiation resistance, self-lubrication, high temperature resistance, low temperature resistance, etc. It has important applications in aerospace, aviation, military industry, electronics, nuclear energy, and metallurgy. In particular, high-purity graphite has developed into an indispensable new functional material in many fields such as industry, medicine and military. High-purity graphite is graphite with a carbon content of more than 99.9%. The production of high-purity graphite is mainly to remove impurities in graphite through purification. [0003] The purification methods of graphite are mainly divided into chemical purification method and physica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/215
CPCC01P2006/80
Inventor 陈怡璇段红霞
Owner 陕西六元碳晶科技有限公司
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