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Method for preparing high-performance carbon-graphite material through solvent pretreatment of green coke powder

A pretreatment and carbon-graphite technology, which is applied in the field of solvent pretreatment of green coke powder to prepare high-performance carbon-graphite materials, can solve the problems of long preparation process cycle, large environmental pollution, and low yield

Active Publication Date: 2021-09-14
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the product performance has been improved to a certain extent, the preparation process cycle is long, the energy consumption is greatly increased, and the yield is low. At the same time, a large amount of harmful gases will be generated during the sintering process due to binders such as coal tar pitch and coal tar, which will cause great environmental pollution.

Method used

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  • Method for preparing high-performance carbon-graphite material through solvent pretreatment of green coke powder
  • Method for preparing high-performance carbon-graphite material through solvent pretreatment of green coke powder
  • Method for preparing high-performance carbon-graphite material through solvent pretreatment of green coke powder

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preparation example Construction

[0032] During specific implementation, the preparation method of carbon graphite material may further comprise the steps:

[0033] (1) Weigh the green coke powder, organic solvent and dispersant separately, and set aside; the particle size of the green coke powder is 2~10 μm, the mass ratio of the green coke powder and the organic solvent is 1:1~3, and the dispersant accounts for 1~3% of powder mass;

[0034] (2) Dissolve the dispersant weighed in step (1) into the organic solvent weighed in step (1), and put it into the raw coke powder weighed in step (1) in batches after dissolving evenly. Constantly forced to stir, continue to stir for a period of time after the addition is complete, then stand and age for 10-24 hours, and finally obtain pretreated green coke powder through vacuum filtration, washing and drying;

[0035] Because the surface energy of raw coke powder is relatively large, it is easy to agglomerate. Adding a dispersant here can effectively prevent the agglome...

Embodiment 1

[0052] (1) Weigh a certain amount of raw coke powder, and weigh the same amount of absolute ethanol (organic solvent) for use, and weigh cetyltrimethylammonium bromide (1% of the total mass of raw coke powder) at the same time Dispersant) spare;

[0053] (2) Dissolve the dispersant evenly in the organic solvent, put it into the green coke powder in 3 times through the combination of ultrasonic dispersion and mechanical stirring, ultrasonic time: 5 h, ultrasonic working frequency: 40 khz, mechanical stirring time: 10 h, mechanical stirring speed: 500 r / min, aging for 24 h, and set aside.

[0054] (3) Choose a medium-speed double-layer filter paper and a Buchner funnel, and wash the aging solution prepared in step (2) by vacuum filtration, wash 3 times, and the suction filtration pressure is 0.8 MPa. Dry in a vacuum drying oven for 10 h, crush and dry the sample with a high-speed universal pulverizer, and sieve through an 80-mesh sieve to obtain pretreated raw coke powder (name...

Embodiment 2

[0058] The steps are the same as in Example 1, except that the organic solvent used in Example 2 is dichloromethane, and the obtained pretreated green coke powder is named GPCD.

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Abstract

The invention discloses a method for preparing a high-performance carbon-graphite material through solvent pretreatment of green coke powder. The methodcomprises the following steps: removing low-molecular-weight organic matters in green coke powder with an organic solvent to obtain pretreated green coke powder, then carrying out compression molding on the pretreated green coke powder to form a green body, and finally sintering the green body to obtain the carbon-graphite material. According to the invention, the method does not need to use a binder, and is short in production period, low in energy consumption and environment-friendly, and the prepared carbon-graphite material is uniform in structural form, stable in bonding component, consistent in thermal shrinkage and high in density.

Description

technical field [0001] The invention belongs to the technical field of carbon and graphite materials, and in particular relates to a method for preparing high-performance carbon and graphite materials by pretreating green coke powder with a solvent. Background technique [0002] Carbon graphite is widely used in core fields such as aerospace, high-speed rail, automobiles, photovoltaics, nuclear power, and communications because of its excellent properties such as light weight, high-temperature self-lubrication, stable chemical properties, and low expansion coefficient. [0003] my country's traditional carbon and graphite materials use coal tar pitch, coal tar, etc. as binders, raw coke powder, calcined coke, delayed coke, carbon black and graphite powder as aggregates, after kneading, rolling, crushing, grinding, It is prepared after pressing, roasting, dipping, multiple roasting-dipping-re-calcining densification and graphitization purification. The aggregate used in this ...

Claims

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Application Information

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IPC IPC(8): C04B35/528C04B35/622
CPCC04B35/522C04B35/622C04B2235/5436C04B2235/608C04B2235/658C04B2235/6562C04B2235/6565C04B2235/6567
Inventor 涂川俊刘平谭姣徐宇轩巩佩
Owner HUNAN UNIV
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