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5N high-purity carbon dust preparation process

A preparation process and carbon powder technology, applied in the field of 5N high-purity carbon powder preparation process, can solve the problems of high requirements for high-temperature calcination equipment, secondary pollution, and difficult removal of high-boiling impurities

Active Publication Date: 2015-02-18
峨嵋半导体材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the fine particle size and strong adsorption capacity of the carbon powder, secondary pollution is often caused during the preparation process; and the high-boiling impurities in the carbon powder are difficult to remove, and the high-temperature calcination equipment required is relatively high, and the domestic technology hard to reach
At present, domestic technology to prepare toner can only reach 99.99%-99.995%

Method used

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  • 5N high-purity carbon dust preparation process
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Effect test

Embodiment 1

[0022] Embodiment 1: Preparation of 200-300 mesh, 5N high-purity carbon powder

[0023] Use 2500g of industrial carbon powder with a purity of 3N and a size of 300 mesh as raw material, and then prepare 5N carbon powder through wet purification of carbon powder, low-temperature volatilization and ultra-high temperature calcination in sequence. The steps are as follows:

[0024] (1) Toner raw material washing

[0025] Put 2500g of carbon powder into the PTFE bucket, add exchange water, then add an appropriate amount of washing liquid into the PTFE bucket, stir well with the PTFE rod, soak the toner in the washing liquid for 10 hours, and soak it from time to time during the soaking process. Stir with a tetrafluoro rod, or pass in an appropriate amount of argon gas to stir, and the flow rate of the argon gas is subject to the solution in the tetrafluoro barrel not splashing out. After soaking, pour off the supernatant liquid, and then wash with exchanged water several ...

Embodiment 2

[0040] Embodiment 2: Preparation of 300-350 mesh, 5N high-purity carbon powder

[0041] Use 2500g of industrial carbon powder with a purity of 3N and a size of 350 mesh as raw material, and then prepare 5N carbon powder through wet purification of carbon powder, low-temperature volatilization and ultra-high temperature calcination in sequence. The steps are as follows:

[0042] (1) Toner raw material washing

[0043] Put 2500g of carbon powder into the PTFE bucket, add exchange water, then add an appropriate amount of washing liquid into the PTFE bucket, stir well with a PTFE stick, soak the toner in the washing liquid for 8 hours, and soak it from time to time during the soaking process. Stir with a tetrafluoro rod, or pass in an appropriate amount of argon gas to stir, and the flow rate of the argon gas is subject to the solution in the tetrafluoro barrel not splashing out. After soaking, pour off the supernatant liquid, and then wash with exchanged water several time...

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Abstract

The invention belongs to the field of material preparation, and particularly relates to a 5N high-purity carbon dust preparation process. The 5N high-purity carbon dust preparation process comprises the following steps: using 3N industrial carbon dust as a raw material, and then sequentially carrying out wet-process carbon dust purification, low-temperature volatilization and superhigh-temperature calcination to prepare 5N high-purity carbon dust. The wet-process carbon dust purification particularly comprises the following steps: using a certain concentration of hydrochloric acid, nitric acid and hydrofluoric acid to mix, then placing the carbon dust raw material in a mixed acid solution for soaking for more than 96 hours, introducing argon in the soaking process and stirring, wherein argon flow is determined in the way that the mixed solution cannot spill out of a PTFE barrel. Through the temperature control during the low-temperature volatilization process, a sulfur element volatilizes through temperature rising, and the sulfur element in carbon dust is removed. The condition that a sulfide with higher boiling point is generated through reaction of sulfur and ferrum, magnesium and carbon during the high-temperature calcinations process, so that the carbon dust purifying difficulty is improved is avoided. The preparation process can enable the carbon dust purity to be improved by 99.999%.

Description

technical field [0001] The invention belongs to the field of material preparation, in particular to a preparation process of 5N high-purity carbon powder. Background technique [0002] High-purity carbon powder is mainly used to prepare silicon carbide and graphite electrodes, which are widely used in machinery, electricity, electronics, defense industry and other industries. [0003] With the continuous improvement of material properties and the development of new properties, silicon carbide has gradually moved from traditional applications to high-performance and high-tech applications. Using the high temperature, high strength, wear resistance, corrosion resistance and other properties of silicon carbide materials as structural parts, it is used in automobiles, machinery, petrochemical and other industrial fields. As mechanical parts, such as mechanical seals against wear parts, wear-resistant, vulnerable parts, bushings, bearings, etc. Utilizing the high thermal conduc...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 詹科曹昌威雷聪种娜杨旭
Owner 峨嵋半导体材料研究所