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Pretreatment process of raw materials for preparing coal-based needle coke

A needle coke and pretreatment technology, applied in the processing of tar pitch/petroleum pitch/natural pitch, coke oven, petroleum industry, etc., can solve the problem of complex composition of coal tar pitch, unsatisfactory, increasing production cost of needle coke, etc. problems, to achieve the effect of broadening the range of raw material selection, reducing production costs, and reducing requirements

Pending Publication Date: 2022-07-29
宁夏百川新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the production of coal-based needle coke, there are the following problems: First, due to the complex composition of most coal tar pitches, coal tar pitch for the production of coal-based needle coke products has always been in short supply, especially in recent years when environmental protection requirements As a result, the coal tar pitch for the production of coal-based needle coke is increasingly in short supply, and the price of coal tar pitch continues to increase, resulting in a substantial increase in the production cost of needle coke
Secondly, in the production of needle coke, the requirements for the content of quinoline insolubles in the raw coal tar pitch are relatively high, resulting in some coal tar pitches with a high content of quinoline insolubles unable to meet the requirements of raw materials for needle coke production

Method used

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Effect test

Embodiment 1

[0024] The pretreatment process for preparing raw materials of coal-based needle coke of the present embodiment includes the following steps:

[0025] (1) Raw material mixing: mix coal tar pitch (sulfur 0.6%, quinoline insolubles 6.7%) and solvent at 90° C. and normal pressure according to a mass ratio of 0.5:1 to obtain a mixed solution;

[0026] (2) Primary sedimentation: Before injecting the material, according to the mass ratio of solvent: coal tar pitch = 0.2:1, inject solvent into the bottom of the primary sedimentation tank, and then add the mixed solution obtained in step (1) into the primary sedimentation tank for a Settling treatment, the temperature of the first settling is 90℃, and the time of the first settling is 4h. After the first settling is completed, the heavy components are extracted from the bottom of the primary settling tank, and the light components are extracted from the top of the primary settling tank;

[0027] (3) Secondary sedimentation: Before inj...

Embodiment 2

[0032] The pretreatment process for preparing raw materials of coal-based needle coke of the present embodiment includes the following steps:

[0033] (1) Raw material mixing: mix coal tar pitch (sulfur 0.6%, quinoline insolubles 6.7%) and solvent at 110° C. and normal pressure according to a mass ratio of 1:1 to obtain a mixed solution;

[0034] (2) Primary sedimentation: Before injecting the material, according to the mass ratio of solvent: coal tar pitch = 0.3:1, inject solvent into the bottom of the primary sedimentation tank, and then add the mixed solution obtained in step (1) into the primary sedimentation tank for a Settling treatment, the temperature of one settling is 110℃, the time of one settling is 3h, after the first settling is completed, the heavy components are extracted from the bottom of the primary settling tank, and the light components are extracted from the top of the primary settling tank;

[0035](3) Secondary sedimentation: Before injecting the materi...

Embodiment 3

[0040] The pretreatment process for preparing raw materials of coal-based needle coke of the present embodiment includes the following steps:

[0041] (1) Mixing of raw materials: mix coal tar pitch (sulfur 0.58%, quinoline insolubles 8.9%) and solvent at 130° C. and normal pressure according to a mass ratio of 1.5:1 to obtain a mixed solution;

[0042] (2) Primary sedimentation: Before injecting the material, according to the mass ratio of solvent: coal tar pitch = 0.4:1, inject the solvent into the bottom of the primary sedimentation tank, and then add the mixed solution obtained in step (1) into the primary sedimentation tank for a Settling treatment, the temperature of the first settling is 130℃, the time of the first settling is 2h, after the first settling is completed, the heavy components are extracted from the bottom of the primary settling tank, and the light components are extracted from the top of the primary settling tank;

[0043] (3) Secondary sedimentation: Bef...

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Abstract

The invention discloses a pretreatment process of raw materials for preparing coal-based needle coke. The pretreatment process comprises the following steps: (1) mixing the raw materials; (2) primary sedimentation; (3) secondary sedimentation; (4) heavy phase distillation; (5) distilling a light phase; and (6) solvent circulation. According to the method, two different solvents are mixed into a mixed solvent according to the principle of solvent extraction and sedimentation, in order to improve the efficiency, two times of extraction and sedimentation separation are carried out, then a heavy phase and a light phase which are separated are separated according to different densities, and finally distillation is carried out to recover the solvent. Through innovation and improvement of the process, on one hand, the yield of the intermediate product refined pitch is increased, on the other hand, the quinoline insoluble component can be effectively removed, the requirement for the quinoline insoluble content in the coal tar pitch is lowered, the selection range of raw materials is widened, and finally the purposes of increasing the yield of the needle coke and reducing the production cost of the needle coke are achieved.

Description

technical field [0001] The invention relates to the technical field of coal chemical production, in particular to a pretreatment process for preparing raw materials of coal-based needle coke. Background technique [0002] Needle coke is a high-quality carbon material. It is named after the slender needle-like structure after pulverization. It has good orientation and strong electrical and thermal conductivity. It is the main raw material for the manufacture of ultra-high power graphite electrodes. The ultra-high power graphite electrode produced by coke has the advantages of low resistivity, high bulk density, high mechanical strength, small thermal expansion coefficient, and good thermal shock resistance. Needle coke graphitized products are widely used in electric furnace steelmaking electrodes, nuclear reactor deceleration materials and rocket technology. [0003] The needle coke currently produced can be divided into two categories: oil-based needle coke and coal-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/08C10B53/00C10C3/00C10C3/06
CPCC10B57/08C10B53/00C10C3/005C10C3/06C10C3/00
Inventor 郑铁江蒋国强曹圣平李慎耐姜伟伟陈电华马俊华
Owner 宁夏百川新材料有限公司
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