Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for purifying high-purity carbon powder

A carbon powder and process technology, applied in the field of metal smelting, can solve the problems of high cost, poor purification effect, atmospheric environmental pollution, etc., and achieve the effects of removing impurities, reducing production costs and simple operation.

Pending Publication Date: 2022-07-12
甘肃华瑞鸿程新材料科技有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a process for purifying high-purity carbon powder in view of the problems existing in the prior art, which can solve the problems that the existing carbon powder purification methods are expensive, easily cause atmospheric environmental pollution, and have poor purification effects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A process for purifying high-purity carbon powder, comprising the following steps:

[0018] a. After purifying the block graphite to a particle size of 400-500 mesh, add a halogen complex salt such as sodium hexafluorophosphate NaPF6 at a ratio of 1:0.2, and stir evenly;

[0019] b. Pour the mixture in step b into the purification furnace, turn on the vacuum pump and the pumping valve in turn to start vacuuming the purification furnace, and close the vacuum pump and the pumping valve until the vacuum degree is -320Pa;

[0020] c. Open the intake valve and fill the furnace with argon until the negative pressure in the furnace is 0-1Pa, start heating the materials in the furnace, and open the exhaust valve;

[0021] d. When heated to a temperature of 2400 °C, keep the temperature for 1 hour, and continue to heat to 2800-2900 °C after the insulation, and keep it for 3 hours;

[0022] e. After the heat preservation, the materials in the purification furnace are naturally c...

Embodiment 2

[0025] A process for purifying high-purity carbon powder, comprising the following steps:

[0026] a. After the block graphite is powdered to a particle size of 400-500 mesh, a halogen complex salt such as sodium hexafluorophosphate NaPF6 is added at a ratio of 1:0.35, and stirred evenly;

[0027] b. Pour the mixture in step b into the purification furnace, turn on the vacuum pump and the pumping valve in turn to start vacuuming the purification furnace, and close the vacuum pump and the pumping valve until the vacuum degree is -320Pa;

[0028] c. Open the intake valve and fill the furnace with argon until the negative pressure in the furnace is 0-1Pa, start heating the materials in the furnace, and open the exhaust valve;

[0029] d. When heated to a temperature of 2400 °C, keep the temperature for 1 hour, and continue to heat to 2800-2900 °C after the insulation, and keep it for 3 hours;

[0030] e. After the heat preservation, the materials in the purification furnace are ...

Embodiment 3

[0033] A process for purifying high-purity carbon powder, comprising the following steps:

[0034] a. After purifying the block graphite to a particle size of 400-500 mesh, add a halogen complex salt such as sodium hexafluorophosphate NaPF6 at a ratio of 1:0.5, and stir evenly;

[0035] b. Pour the mixture in step b into the purification furnace, turn on the vacuum pump and the pumping valve in turn to start vacuuming the purification furnace, and close the vacuum pump and the pumping valve until the vacuum degree is -320Pa;

[0036] c. Open the intake valve and fill the furnace with argon until the negative pressure in the furnace is 0-1Pa, start heating the materials in the furnace, and open the exhaust valve;

[0037] d. When heated to a temperature of 2400 °C, keep the temperature for 1 hour, and continue to heat to 2800-2900 °C after the insulation, and keep it for 3 hours;

[0038] e. After the heat preservation, the materials in the purification furnace are naturally c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a process for purifying high-purity carbon powder, which adopts an intermittent treatment mode, comprises the steps of mixing an additive into graphite powder, heating, sintering and purifying, cooling, and finally completing material taking, the purity of the obtained carbon powder can reach 99.999%, and the boron element content is less than 0.01 ppm. Chlorine and Freon gas adopted in traditional carbon powder purification are avoided, the mode is high in equipment requirement, meanwhile, the added chlorine and Freon can cause air pollution and affect human health, environment pollution cannot be caused in the carbon powder purification process, meanwhile, operation is easy, the production cost can be greatly reduced, and the method is suitable for industrial production. Meanwhile, the purity requirement is met, and impurities are removed.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and relates to a process for purifying high-purity carbon powder. Background technique [0002] The third-generation semiconductor crystal garden uses silicon carbide as the substrate material, and the high-purity silicon carbide powder is made of high-purity carbon powder and high-purity silicon powder. The content of carbon powder is less than 0.01ppm. Therefore, in order to improve the purity of carbon powder and reduce the impurity content, many domestic suppliers adopt acid-base method such as adding freon and chlorine to purify carbon powder. This method is not only expensive, but also easy to cause serious pollution of the atmospheric environment. Therefore, the present invention provides a process for purifying high-purity carbon powder to solve the above problems. SUMMARY OF THE INVENTION [0003] The object of the present invention is to provide a process for purifying high-pu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B32/215
CPCC01B32/215Y02P20/10
Inventor 孔琳琳孔杰孔么乃周付民马丽娅
Owner 甘肃华瑞鸿程新材料科技有限公司