High-purity graphite powder and purification process thereof

A high-purity graphite powder, graphite powder technology, applied in inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problem of difficult removal of impurities, and achieve the effect of increasing reaction time and high practical value

Inactive Publication Date: 2019-02-01
ADVANCED FOR MATERIALS & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a kind of high-purity graphite and its purification process in view of the technical problems that the impurities with high temperature and high boiling point are difficult to remove in the purification process of the above-mentioned prior art

Method used

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  • High-purity graphite powder and purification process thereof
  • High-purity graphite powder and purification process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 Shown, a kind of purification process of high-purity graphite powder comprises the steps:

[0027] S1. Add microcrystalline graphite with a particle size D50 of 0.2 to 0.5mm and a purity of 88% into a graphite boat with a size of 300×300×150mm, and put the loaded graphite boat into a cavity with a size of 600mm In the graphite purification equipment of ×600×900mm, vacuumize to -95KPa and hold the pressure for 1h;

[0028] S2. When the pressure rise rate is qualified and the temperature rises to 1600°C, start to feed CCl at the same time 4 and CHClF 2 , the flow rate is 100L / h, the absolute pressure value of the purified gas is 3KPa, and the vacuum is re-evacuated to the pressure -95KPa after holding the pressure for 0.5h;

[0029] S3. Raise the temperature to 2200°C at a heating rate of 1°C / min. During this period, carry out the purification operation in the pulse mode of vacuuming, filling purified gas, maintaining pressure and vacuuming again. After h...

Embodiment 2

[0033] A purification process for high-purity graphite powder, comprising the steps:

[0034] S1. Add flake graphite with a particle size D50 of 0.3-0.6mm and a purity of 88% into a graphite boat with a size of 300×300×150mm, and put the charged graphite boat into an inner cavity with a size of 600× In the 600×900mm graphite purification equipment, vacuumize to -98KPa, and hold the pressure for 1h;

[0035] S2. When the pressure rise rate is qualified and the temperature rises to 1550°C, start to feed CCl at the same time 4 and CHClF 2 , the flow rate is 300L / h, the absolute pressure value of the purified gas is 5KPa, and the vacuum is re-evacuated to the pressure of -98KPa after holding the pressure for 1h;

[0036] S3. Raise the temperature to 2250°C at a heating rate of 3°C / min. During this period, perform the purification operation in the pulse mode of vacuuming, filling purified gas, holding pressure and vacuumizing again. After holding at 2250°C for 3 hours, stop the p...

Embodiment 3

[0040] S1. Add needle-shaped petroleum coke with a particle size D50 of 0.3 to 0.8mm and a purity of 88% into a graphite boat with a size of 300×300×150mm, and put the charged graphite boat into an inner cavity with a size of In the graphite purification equipment of 600×600×900mm, vacuumize to -96KPa and keep the pressure for 1h;

[0041] S2. When the pressure rise rate is qualified and the temperature rises to 1700°C, start to feed CCl at the same time 4 and CHClF 2 , the flow rate is 200L / h, the absolute pressure value of the purified gas is 4KPa, and the vacuum is re-evacuated to the pressure of -96KPa after holding the pressure for 0.8h;

[0042] S3. Raise the temperature to 2350°C at a heating rate of 2°C / min. During this period, perform the purification operation in the pulse mode of vacuuming, filling purified gas, maintaining pressure and vacuuming again. After holding at 2350°C for 3 hours, stop the pulse type purification operation ;

[0043] S4. When the tempera...

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Abstract

The invention relates to high-purity graphite powder and a purification process thereof. The process comprises the following steps: adding a graphite powder raw material in a graphite boat, mounting the graphite boat in purification equipment, vacuumizing until the pressure is minus 83-minus 100 KPa, and maintaining pressure for 0.5-2 h; after pressure rise rate is qualified, heating to the temperature of 1200-1800 DEG C, feeding a certain amount of purified gas, and after maintaining the pressure, vacuumizing until pressure reaches minus 93-minus 100 KPa; during heating period, carrying out impulse type purification, insulating for 1-3 h at a certain temperature in a temperature range of 2000-3000 DEG C, and then stopping impulse type purification; and vacuumizing and cooling to the temperature of 1200-1500 DEG C, feeding argon and enabling the temperature to be reduced to a room temperature to obtain the high-purity graphite powder. According to the purification process, volatilizedimpurities can be discharged in time by an impulse type process at a low temperature, the problem that key impurities such as B, Al and V in the graphite powder raw material are removed deeply is solved, therefore, the high-purity graphite powder with the purity reaching 99.999%-99.9999% is obtained, and a feasible path is provided for industrialized production of the high-purity graphite powder.

Description

technical field [0001] The invention relates to the technical field of graphite powder materials, and more specifically, to a high-purity graphite powder and a purification process thereof. Background technique [0002] Graphite has many advantages such as low density, corrosion resistance, radiation resistance, self-lubrication, high and low temperature resistance, etc. It has important applications in aerospace, aviation, military industry, electronics, nuclear energy, metallurgy and other fields. With the continuous development of new technologies and new processes, ordinary high-purity graphite materials can no longer meet the needs of many industries. The quality of graphite purification determines the use characteristics and comprehensive performance of graphite materials. The higher the purity of graphite, the higher the application value . [0003] At present, there are mainly chemical methods for graphite purification at home and abroad, including flotation, alkali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215C01B32/205
CPCC01B32/205C01B32/215
Inventor 戴煜邓军旺许鹏谢煜明
Owner ADVANCED FOR MATERIALS & EQUIP
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