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Purifying process for synthesizing graphite core column for industrial diamonds

The technology of a graphite core column and a treatment process is applied in the field of purification and treatment process of a graphite core column for synthesizing industrial diamonds, which can solve the problems of long reaction time, high cost and high energy consumption, and achieves good effects, resource saving and huge economic benefits. Effect

Active Publication Date: 2017-01-25
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: long reaction time, high energy consumption, and the need to introduce reducing gas, high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of purification process of graphite core post for synthetic industrial diamond, comprising the steps:

[0023] (1) Send the graphite core column into the vacuum heating furnace;

[0024] (2) Pre-evacuate the vacuum heating furnace until the vacuum degree in the furnace reaches 8×10 -3 Pa above;

[0025] (3) Heat to 175°C for 1 hour;

[0026] (4) Heating to 1030°C and keeping it warm, the vacuum degree is stable between 180 and 240Pa;

[0027] (5) When the test value of the vacuum degree in the furnace continues to drop for three consecutive minutes while the Roots pump is stopped, turn on all vacuum pumps to evacuate to 0.1 Pa, fill in high-purity nitrogen with a purity of 99.999%, and start the cooling fan to cool the material.

Embodiment 2

[0029] A kind of purification process of graphite core post for synthetic industrial diamond, comprising the steps:

[0030] (1) Send the graphite core column into the vacuum heating furnace;

[0031] (2) Pre-evacuate the vacuum heating furnace until the vacuum degree in the furnace reaches 8×10 -3 Pa above;

[0032] (3) Heat to 185°C for 1 hour;

[0033] (4) Heating to 1060°C and keeping it warm, the vacuum degree is stable between 120-180Pa;

[0034] (5) When the test value of the vacuum degree in the furnace continues to drop for three consecutive minutes while the Roots pump is stopped, turn on all vacuum pumps to evacuate to 0.1 Pa, fill in high-purity nitrogen with a purity of 99.999%, and start the cooling fan to cool the material.

Embodiment 3

[0036] A kind of purification process of graphite core post for synthetic industrial diamond, comprising the steps:

[0037] (1) Send the graphite core column into the vacuum heating furnace;

[0038] (2) Pre-evacuate the vacuum heating furnace until the vacuum degree in the furnace reaches 8×10 -3 Pa above;

[0039] (3) Heat to 180°C for 1 hour;

[0040] (4) Heating to 1050°C and keeping it warm, the vacuum degree is stable between 150-200Pa;

[0041] (5) When the test value of the vacuum degree in the furnace continues to drop for three consecutive minutes while the Roots pump is stopped, turn on all vacuum pumps to evacuate to 0.1 Pa, fill in high-purity nitrogen with a purity of 99.999%, and start the cooling fan to cool the material.

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PUM

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Abstract

The invention discloses a purifying process for synthesizing graphite core column for industrial diamonds; by making use of the ability of carbon in graphite to reduce at high temperature, pre-evacuating, degassing and dewatering at held temperature are carried out, air and adsorbed water in pores of a graphite core column are discharged, the temperature is raised to 1045+ / -15 DEG C, vacuum degree is maintained stably between 120-240 Pa, reaction reaches deep in metal oxides by the aid of permeability of carbon monoxide gas, and reducing is more thorough. The process saves electricity since a pump is stopped at high temperature and reducing time is shortened; by providing conditions and using self-produced gas to replace reducing gas to be charged, resources are saved, and impurities are not introduced; the process provides thorough and effective purification, is high in efficiency and has huge economic benefit.

Description

technical field [0001] The invention belongs to the technical field of synthetic production of superhard materials, and in particular relates to a purification treatment process of graphite core columns for synthetic industrial diamonds. Background technique [0002] Diamond is the hardest substance in nature, and it is widely used in the manufacture of grinding and drilling tools, precision instruments, etc. Natural diamonds are produced from graphite materials under extremely special conditions such as volcanic eruptions and asteroids hitting the earth under high temperature and high pressure conditions. The existing human technology cannot simulate the environment in which natural diamonds are produced. In industry, metal catalysts are used to reduce the pressure and temperature conditions required for diamond formation. The main production process is: mixing graphite powder, metal catalysts and other raw materials and pressing them into powders Synthetic pellets, mixing...

Claims

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Application Information

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IPC IPC(8): C01B32/215
Inventor 卢灿华张凤岭包玉合杨怀建张玉岗
Owner ZHONGNAN DIAMOND CO LTD
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