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Preparation of asphalt for producing coal-based needle coke

A technology of needle coke and coal series, applied in coking ovens, coking carbonaceous materials, tar processing through distillation, etc., can solve the problems of high production cost, complicated process, low utilization rate of needle coke raw materials, etc., and achieve high-quality products Good quality, low preparation cost, resource saving effect

Inactive Publication Date: 2008-11-12
邯郸市鑫宝煤化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has disadvantages such as complex process, high production cost, and low utilization rate of needle coke raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] After fully mixing 25kg of metallurgical coke powder crushed to 80 mesh and 125kg of washing oil, put it into a three-legged centrifuge. A uniform metallurgical coke powder filter cake is formed in the cloth; after mixing 500kg of coal tar and 750kg of washing oil, add 25kg of metallurgical coke powder and mix thoroughly; add the mixed solution at a temperature of 80°C to form a uniform metallurgical coke powder filter cake In a three-legged centrifuge, centrifugal filtration is performed at a speed of 1000 rpm, and the obtained centrifugate is distilled out of the solvent at 270°C under normal pressure to obtain 276kg of pitch for the production of coal-based needle coke. The softening point of the pitch is At 34°C, the quinoline insoluble content was 0.23%.

Embodiment 2

[0016] Mix 10kg of diatomite crushed to 100 mesh and 10kg of metallurgical coke powder crushed to 100 mesh with 180kg of washing oil, and then add them to a three-legged centrifuge. The solvent is separated by rotating speed centrifugation, so that a uniform filter cake of diatomite and metallurgical coke powder mixture is formed in the filter cloth; 600kg coal tar and 1000kg washing oil are mixed, and then a mixture of 24kg diatomite and 24kg metallurgical coke powder is added to fully Mix, add the mixed liquid at a temperature of 90°C to a three-legged centrifuge that has formed a uniform filter cake of diatomite and metallurgical rubber powder, and centrifugally filter at a speed of 1200 rpm. The solvent was distilled off under normal pressure to obtain 324 kg of pitch for producing coal-based needle coke. The pitch had a softening point of 35° C. and a quinoline-insoluble content of 0.22%.

Embodiment 3

[0018] After fully mixing 25kg of coal powder and 175kg of washing oil, put it into a three-legged centrifuge. The filter cloth of the centrifuge has a mesh number of 500 mesh, and the solvent is separated by centrifugation at a speed of 1100 rpm, thereby forming a uniform in the filter cloth. Coal powder filter cake; mix 450kg of coal tar pitch with a softening point of 35°C and 1350kg of washing oil, then add 45kg of coal powder and mix thoroughly; add the mixture at a temperature of 100°C to a three-legged filter cake that has formed a uniform coal powder filter cake In the centrifuge, the centrifuge was filtered at a speed of 1100 rpm, and the obtained centrifugate was distilled out of the solvent at 280°C under normal pressure to obtain 396kg of pitch for the production of coal-based needle coke. The softening point of the pitch was 36°C. The quinoline insoluble content was 0.25%.

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Abstract

The invention discloses a method for preparing pitch used for producing coal-based needle coke. The method comprises the following steps that: coal tar and coal pitch are taken as raw materials; coal tar light compositions are taken as solvent; coal dust, metallurgical coke powder, or mixture of the metallurgical coke powder and diatomite, or mixture of the metallurgical coke powder and expanded perlite are taken as filter aid; uniform filter aid filter cakes are formed in a centrifuge by filter aid mixture at first, and then mixture of the coal pitch or the coal tar, wash oil and the filter aid is added into the centrifuge in which the uniform filter aid filter cakes are formed for centrifugal filtration; and obtained centrifugate is driven to pass through atmospheric distillation recovery solvent, so as toe obtain the refining pitch raw materials which are suitable for producing the coal-based needle coke. The yield of the pitch raw materials used for producing the coal-based needle coke prepared by the technology is improved by 10 to 15 percent compared with other methods; the manufacturing technique is simple and the preparation cost is low; and the mass production is easy to realize.

Description

technical field [0001] The invention relates to a method for preparing pitch for producing coal-based needle coke, which belongs to the technology of coal-based needle coke. Background technique [0002] Needle coke is the main raw material for the production of high-power (HP) and ultra-high-power (UHP) graphite electrodes. According to the source of raw materials, it can be divided into two categories: petroleum-based needle coke and coal-based needle coke. Due to the high price of petroleum and the low coking yield of needle coke using petroleum as raw material, the development of coal-based needle coke production technology has been promoted. [0003] Many researches have shown that: coal tar or coal tar pitch contains a certain amount of quinoline insolubles (QI). During the heating process, they adhere to the small spheres of the mesophase, hindering the formation, growth and fusion of the spheres of the mesophase. The sphere is not easy to grow up, and only a non-ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/16C10B55/00
Inventor 王成扬魏宝生陈明鸣周小野
Owner 邯郸市鑫宝煤化工有限公司
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