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Method for preparing isotropic coke

A technology of isotropic coke and quinoline, which is applied in the field of preparation of isotropic coke, can solve the problems of increasing the inflation coefficient and difficulty in uniform distribution, and achieves the effects of easy operation, strong controllability and wide source of raw materials

Active Publication Date: 2014-06-11
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above patents are based on petroleum residues as raw materials, and my country is a large coal country. It has great advantages to prepare isotropic coke from coal tar pitch. The general preparation method is to add inorganic catalysts or add very fine calcined coke particles or The chemical reaction of polycondensation and crosslinking occurs when the air is introduced, and the added inorganic catalyst can be removed in the subsequent calcination process, but this will increase the inflation coefficient to a certain extent; at the same time, calcined coke particles are added during the production process, which is difficult to distribute evenly

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Experimental program
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Effect test

Embodiment 1

[0022] 700 grams of coal tar pitch with a quinoline insoluble content of 10.43% is placed in the reactor, heated at a rate of 120°C / hour, and stirred at 150°C. Continue to raise the temperature to 410° C. under the heating rate, and carry out the polymerization reaction at a constant temperature for 5 hours to obtain the asphalt polymerization mother liquor. Put the prepared asphalt polymerization mother liquor into a test tube under normal pressure, raise it to 500°C at a heating rate of 15°C / h, discharge the gas generated during carbonization through the control valve, and keep the pressure not exceeding 0.5Mpa until the end of carbonization. Take out the raw coke sample from the tube for measurement, crush the coke sample to a particle size of 0.2-1 mm, solidify with resin, and observe the microstructure as a fine mosaic structure after grinding and polishing the sample, see figure 1 . The obtained isotropic green coke is made into a volume of 1dm by a small vibration mold...

Embodiment 2

[0024] 500 grams of quinoline insoluble matter content is 15.78% asphaltene material and 1500g quinoline insoluble matter content is 2.35% soft bitumen, obtains quinoline insoluble matter content as 8.21% mixed pitch, it is placed in reactor In the process, heat at a heating rate of 180 °C / h, start stirring at 150 °C, continue to heat up to 420 °C at a stirring rate of 200 rpm and a heating rate of 120 °C / hour, keep the temperature for 8 hours, stop stirring, and start at 20 °C / h The heating rate of h is increased to 530°C, the gas generated during carbonization is discharged through the control valve, and the pressure is kept not exceeding 0.5Mpa until the carbonization is completed, and the coke is discharged for measurement. The obtained raw coke samples were crushed to a particle size of 0.2-1 mm, cured with resin, and the microstructure was observed to be a fine mosaic structure after grinding and polishing. The obtained isotropic green coke is made into a volume of 1dm b...

Embodiment 3

[0026] 1000 grams of asphaltenes with quinoline insoluble content of 13.73% and 1000 g of quinoline insoluble content of 13.42% medium temperature asphalt are uniformly mixed to obtain mixed pitch with quinoline insoluble content of 9.52%, which is placed in the reactor In the process, heat at a heating rate of 180 °C / h, start stirring at 150 °C, continue to heat up to 420 °C at a stirring rate of 200 rpm and a heating rate of 120 °C / h, keep the temperature for 10 hours, stop stirring, and start stirring at 20 °C / h The heating rate of h is increased to 520°C, and the gas generated during carbonization is discharged through the control valve, and the pressure is kept not exceeding 0.5Mpa until the carbonization is completed. out of focus for measurement. The resulting burnt sample was crushed to a particle size of 0.2-1 mm, cured with resin, and the microstructure was observed to be a fine mosaic structure after grinding and polishing. The obtained isotropic green coke is made...

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Abstract

The invention relates to the field of coke making with coal pitch, and particularly relates to a method for preparing isotropic coke. The method comprises the steps of polymerization reaction, carbonization reaction and high-temperature calcination, and is characterized in that the quantity and size of small spheres are controlled by adjusting the content of quinoline insolubles in raw materials as well as adjusting the temperature rising speed, the reaction temperature and the constant temperature time of the polymerization reaction and carbonization reaction; the pitch with the quinoline insoluble content of 5-25 percent is obtained through blending by adding pitch substances with the quinoline insoluble of 10-30 weight percent and the toluene insoluble of 25-55 weight percent into soft pitch or medium temperature pitch. Compared with the prior art, the method for preparing isotropic coke has the advantages of no addition of inorganic additives, homogeneous product property and better subsequent performance, and the optical texture of isotropic coke prepared according to the method is in a fine mosaic structure; the isotropic coke prepared according to the method shows a dense and uniform fine mosaic structure from the microscopic view, the macroscopic CTE ratio is near 1, and the particle stability is not less than 90 percent.

Description

technical field [0001] The invention relates to the field of coal tar pitch coke production, in particular to a preparation method of isotropic coke. Background technique [0002] Due to the different microstructure and properties, carbon materials can be roughly divided into two categories: isotropic and anisotropic. Isotropic coal tar pitch coke is very suitable for the production of isotropic graphite materials due to its high strength and high density. In addition, due to the isotropy of the raw materials, it is not necessary to crush the raw materials to a very fine particle size when producing isotropic graphite. The production of coarse particle formula can greatly shorten the process flow, improve production efficiency and product quality, so isotropic coal tar pitch is used Coke has a higher advantage as an aggregate of high-strength and high-density graphite. Graphite products produced with isotropic coke have better characteristics than those produced by anisotro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00
Inventor 屈滨和凤祥郭明聪武全宇孙刚王文婷
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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