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Charcoal graphitizing method

A bio-carbon and graphitization technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of poor color, small production of artificial diamonds, high impurity content of natural graphite materials, etc. The method is simple and time-consuming Effect

Inactive Publication Date: 2017-05-31
ZHENGZHOU ARTIFICIAL DIAMOND & PROD ENG TECH RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, natural graphite materials have high impurity content and are difficult to purify, especially some harmful impurities that affect diamond synthesis are difficult to remove, such as some silicates and some metal ions, which is why the production of artificial diamonds is generally small and poor in color. s reason

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] A method for wool graphitization, the specific steps are as follows:

[0021] (1) Carbonization treatment: Put 500g of wool into the vacuum welding machine, and the vacuum degree is 5×10 -2 Pa, at 900°C, heat for 18 hours to carbonize it into carbon powder;

[0022] (2) Chemical purification: use a spectrometer to analyze the element content in the carbon powder. After the analysis, add 100 g of carbon powder to the mixed solution of 20g HF, 30g HCl and 120g deionized water and stir evenly, and react for 48h. The mass concentration of HF is 40%, the mass concentration of HCl is 30%, and the purity of HF and HCl is analytical pure;

[0023] (3) Drying: Dry the chemically purified toner in an oven at 100°C.

[0024] (4) Graphitization treatment: heat the dried carbon powder at 2700° C. for 1 hour, and then cool it down to room temperature.

[0025] After using the method of GB / T3521-2008 to test the ash content of the graphitized carbon powder, the ash content is 49PPM...

Embodiment 2

[0027] A method for hair graphitization, the specific steps are as follows:

[0028] (1) Carbonization treatment: put 500g hair into a vacuum carbonization machine, and the vacuum degree is 5×10 -3 Pa, at 1100°C, heat for 21 hours to carbonize it into carbon powder;

[0029] (2) Chemical purification: use a spectrometer to analyze the elemental content in the carbon powder. After the analysis, add 100 g carbon powder to the mixed solution of 45g HF, 55g HCl and 140g deionized water and stir evenly, and react for 60h. The mass concentration of HF is 45%, the mass concentration of HCl is 34%, and the purity of HF and HCl is analytical pure;

[0030] (3) Drying: the chemically purified toner is dried in an oven at 100°C.

[0031] (4) Graphitization treatment: heat the dried carbon powder at 2850° C. for 2.5 hours, and then cool it to room temperature.

[0032] After using the method of GB / T3521-2008 to test the ash content of the graphitized carbon powder, the ash content is 3...

Embodiment 3

[0034] A method for hair graphitization, the specific steps are as follows:

[0035] (1) Carbonization treatment: put 500g hair into a vacuum carbonization machine, and the vacuum degree is 5×10 -4 Pa, at 1300°C, heat for 24 hours to carbonize it into carbon powder;

[0036] (2) Chemical purification: use a spectrum analyzer to analyze the element content in the carbon powder. After the analysis, add 100 g carbon powder to the mixed solution of 70g HF, 80g HCl and 160g deionized water and stir evenly, and react for 72h. The mass concentration of HF is 50%, the mass concentration of HCl is 38%, and the purity of HF and HCl is analytical pure;

[0037] (3) Drying: the chemically purified toner is dried in an oven at 100°C.

[0038] (4) Graphitization treatment: heat the dried carbon powder at 3000° C. for 4 hours, and then cool it to room temperature.

[0039] After using the method of GB / T3521-2008 to test the ash content of the graphitized carbon powder, the ash content is ...

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Abstract

The invention belongs to the technical field of charcoal graphitizing, and specifically relates to a charcoal graphitizing method. The method is characterized in that a charcoal material is sequentially carbonized, chemically purified through HF, HCl and deionized water and dried; the dried charcoal powder remains the temperature under 2700-3000 DEG C and then is cooled to reach the room temperature and finally is warehoused; the carbon content is 99.9% or higher after the graphitizing.

Description

technical field [0001] The invention belongs to the technical field of graphitization of biological carbon, in particular to a method for graphitization of biological carbon. Background technique [0002] At present, there are two main ways to synthesize artificial diamond (diamond large single crystal), high temperature and high pressure method (HPHT) and chemical vapor deposition (CVD). In 1967, the research team of GE Corporation of the United States proposed the high-temperature and high-pressure method (HPHT), which uses graphite as a carbon source to simulate the high-temperature and high-pressure environment inside the earth to transform graphite into diamonds; in 1998, the Carnegie Physical Laboratory of the United States proposed chemical vapor deposition. The CVD method uses gas raw materials to form elementary particles through chemical reactions in the gas phase and then synthesizes diamonds through two stages of nucleation and growth. [0003] Since the 1990s, ...

Claims

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Application Information

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IPC IPC(8): C01B32/205
CPCC01P2002/85C01P2004/03C01P2006/80
Inventor 周金海杨晋中高申杰刘永奇邵静茹刘永涛齐西芹张富威
Owner ZHENGZHOU ARTIFICIAL DIAMOND & PROD ENG TECH RES CENT
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