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Preparation method of high purity graphite

A high-purity graphite and graphite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., to achieve the effect of reducing purification temperature, improving production efficiency, and high application value

Inactive Publication Date: 2019-06-11
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve some problems existing in the purification process of the existing high-purity graphite material, and propose a new high-purity graphite material preparation method

Method used

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  • Preparation method of high purity graphite

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Effect test

specific Embodiment approach 1

[0013] Follow the steps below to prepare high-purity graphite:

[0014] Step 1: Take the graphite raw material that is ground to a particle size of 150-200 μm, and raise the temperature to 1200 °C under the protection of nitrogen gas at a heating rate of 15 °C / min; continue to heat up at 1200-1800 °C at a heating rate of 5 °C / min and simultaneously Introduce a halogen-containing mixed gas and keep it warm at 1680°C for 1 hour to obtain a solid product; the gas flow rate is 1.5m 3 / h;

[0015] Step 2: The obtained solid product continues to heat up in the graphite purification device and at the same time feed 99% chlorine gas to 2300°C, keep it warm for 2 hours, the heating rate is 2°C / min, and the gas flow rate is 2m 3 / h;

[0016] After testing, the carbon content of the graphite after the treatment in the first step is 99%, and the carbon content in the graphite after the treatment in the second step is 99.9999%.

specific Embodiment approach 2

[0017] Follow the steps below to prepare high-purity graphite:

[0018] Step 1: Take the graphite raw material that is ground to a particle size of 150-200 μm, and raise the temperature to 1200 °C under the protection of nitrogen gas at a heating rate of 15 °C / min; continue to heat up at 1200-1800 °C at a heating rate of 5 °C / min and simultaneously Introduce a halogen-containing mixed gas and keep it warm at 1680°C for 1 hour to obtain a solid product; the gas flow rate is 1.5m 3 / h;

[0019] Step 2: The obtained solid product continues to heat up in the graphite purification device and at the same time feed 99% chlorine gas to 2250°C, keep it warm for 2 hours, the temperature rise rate is 2°C / min, and the gas flow rate is 2m 3 / h;

[0020] After testing, the carbon content of the graphite after the treatment in the first step is 99%, and the carbon content in the graphite after the treatment in the second step is 99.999%.

specific Embodiment approach 3

[0021] Follow the steps below to prepare high-purity graphite:

[0022] Step 1: Take the graphite raw material that is ground to a particle size of 150-200 μm, and raise the temperature to 1200 °C under the protection of nitrogen gas at a heating rate of 15 °C / min; continue to heat up at 1200-1800 °C at a heating rate of 5 °C / min and simultaneously Introduce a halogen-containing mixed gas and keep warm at 1800°C for 1 hour to obtain a solid product; the gas flow rate is 1.5m 3 / h;

[0023] Step 2: The obtained solid product continues to heat up in the graphite purification device and at the same time feed 99% chlorine gas to 2100°C, keep it warm for 2 hours, the heating rate is 2°C / min, and the gas flow rate is 2m 3 / h;

[0024] After testing, the carbon content of the graphite after the treatment in the first step is 99%, and the carbon content in the graphite after the treatment in the second step is 99.99%.

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Abstract

The invention relates to a preparation method of a high-purity graphite material, and relates to a preparation method of high-purity graphite. The object of the invention is to solve some problems existing in preparation processes of existing high-purity graphite materials. The method comprises the following specific steps: (1) taking raw material graphite, putting the raw material graphite into aself-made graphite purification device, conducting heating to 1000 DEG C under nitrogen protection, and introducing a certain amount of halogen-containing mixed gas loaded by nitrogen at 1000-1800 DEG C for treatment for 0.5-2.0 h; and (2) continuing to raise the temperature of a solid product obtained after treatment in the step (1) to 2300 DEG C, and introducing a certain amount of gas at 2000to 2300 DEG C for treatment for 1 to 2.0 h, so as to obtain the high-purity graphite. The preparation method of the high-purity graphite provided by the invention can reduce the requirement of a hightemperature method for graphite purification temperature, creates conditions for industrial production of the high-purity graphite with the carbon content of 99.99% or more, and has a low comprehensive cost, and is suitable for industrial production. and industrialization promotion. The method of the invention has a simple preparation process, low energy consumption, small environmental protectionpressure, and good practical promotion value.

Description

technical field [0001] The invention belongs to the technical field of graphite material purification, and in particular relates to a preparation method of high-purity graphite material. Background technique [0002] Graphite has good electrical conductivity, heat conduction, self-lubrication, corrosion resistance, high and low temperature resistance, etc., and plays an important role in the national economy. After the graphite material is purified, graphite with a carbon content of more than 99.9% is called high-purity graphite. The higher the purity of graphite, the greater the application value. For example, high-purity graphite products are widely used in fuel cells, high-temperature nuclear reactors, semiconductor single crystal furnaces, quartz optical fiber drawing furnaces, aerospace vehicles and other applications. The purification of graphite is to take effective measures to remove silicate minerals such as potassium, sodium, magnesium, iron, calcium, aluminum, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215
Inventor 吴泽刘宇佳吴启明单连伟
Owner HARBIN UNIV OF SCI & TECH
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