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Method for preparing high-purity graphite from natural crystalline graphite

A technology of crystalline graphite and high-purity graphite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of limited application scope of production conditions, increased production cost of electricity, and high requirements for equipment operation, and achieves purification. The process is simple and easy to operate, the reaction process is sufficient, and the effect of improving purification efficiency

Inactive Publication Date: 2020-05-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because chlorine gas is poisonous and corrosive, it has high requirements for equipment operation, strict sealing is required, and the tail gas must be properly treated, so its popularization and application are limited to a certain extent.
[0010] (5) The biggest advantage of the high-temperature method is that the carbon content of the product is extremely high, which can reach more than 99.995%. The disadvantage is that a high-temperature furnace must be specially designed and built, the equipment is expensive, and the one-time investment is large. In addition, the energy consumption is large and the electricity bill is high. increased production costs
Moreover, the harsh production conditions also make the application range of this method extremely limited. Only the occasions such as national defense and aerospace that have special requirements for the purity of graphite products consider adopting this method for small batch production of graphite, and it is still impossible to achieve promotion in industry.

Method used

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  • Method for preparing high-purity graphite from natural crystalline graphite

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Effect test

Embodiment 1

[0046] Such as figure 1 Shown, a kind of method adopting natural crystalline graphite to prepare high-purity graphite may further comprise the steps:

[0047] 1), calcium fluoride is put into reactor A, natural graphite fine powder is packed in reactor B, the particle size of described natural graphite fine powder is 280-300 order;

[0048] 2) Heat the reaction kettle A at a temperature of 300-310°C. The gas after heating and gasification is passed into the reaction kettle B to contact with natural graphite fine powder for gas-solid reaction. At the same time, the reaction kettle B is heated and heated. The temperature is 260-270°C, the reaction time of the gas-solid reaction is controlled at 80-100 minutes, the reaction kettle B is provided with a stirring device, and the natural graphite fine powder is stirred during the gas-solid reaction, so that the natural graphite The fine powder is in full contact with the gas to increase the reaction speed;

[0049] 3) After the gas...

Embodiment 2

[0051] This embodiment is based on Example 1, and the difference with Example 1 is that the particle size of the natural graphite fine powder is 260-280 mesh; A reactor is heated, and the heating temperature is 320-330 ° C; The heating temperature is 270-280° C., and the reaction time is controlled within 60-80 minutes, and high-purity graphite powder with a purity of 99.9%-99.99% can also be obtained.

Embodiment 3

[0053] The present embodiment is based on embodiment 1, and the difference from embodiment 1 is that the particle size of the natural graphite fine powder is 200-240 mesh; A reactor is heated, and the heating temperature is 340-350 ° C; The heating temperature is 290-300° C., and the reaction time is controlled within 30-40 minutes, and high-purity graphite powder with a purity of 99.9%-99.99% can also be obtained.

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Abstract

The invention discloses a method for preparing high-purity graphite from natural crystalline graphite. The method comprises the following steps: contacting heated and gasified fluoride with fine natural graphite powder, carrying out a gas-solid reaction for a period of time, conducting cooling to room temperature, and cleaning graphite powder to obtain high-purity graphite powder. According to themethod, the fluoride is heated and gasified to purify the natural crystalline graphite powder, so purification process is simple and easy to operate; and the purified gas is relatively simple to treat, the fluoride can be recycled only by simple condensation, and residual tail gas is introduced into a calcium chloride solution, so the whole process is green and environment-friendly and does not cause any pollution to the environment.

Description

technical field [0001] The invention relates to the field of high-purity graphite preparation, in particular to a method for preparing high-purity graphite by using natural crystalline graphite. Background technique [0002] Graphite is a high-energy crystalline carbon material. Because of its unique structure, electrical conductivity, thermal conductivity, lubrication, high temperature resistance, and stable chemical properties, it has high application value in high-performance materials and is widely used in metallurgy, machinery, In the fields of environmental protection, chemical industry, refractory, electronics, medicine, military industry and aerospace, it has become an indispensable non-metallic material for the development of modern industry and high, new and cutting-edge technology. [0003] According to the degree of crystallization, natural graphite can be divided into two types: crystalline graphite (scale) and aphanitic graphite (earth). The characteristic of ...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B32/215
CPCC01B32/205C01B32/215
Inventor 罗大伟汪锐黄舰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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