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Preparation method of isostatic pressing formed graphite

A technology of isostatic pressing and graphite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of not easy to mix and knead uniformly, not easy to achieve full penetration of coal tar pitch, etc., and achieve fine and dense structure and good uniformity. , the effect of excellent mechanical properties

Inactive Publication Date: 2013-05-29
SICHUAN GUANGHAN SHIDA CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the aggregate of isostatic graphite is composed of fine powder of petroleum coke or pitch coke particles with an average particle size ranging from less than 1 micron to tens of microns, and has a large specific surface area, so when coal tar pitch is added to the kneading pot for kneading, Coal tar pitch and aggregate fine powder are not easy to mix and knead evenly, and it is difficult to achieve the required coal tar pitch to fully penetrate into the pores of aggregate particle fine powder and evenly coat the surface of aggregate particle fine powder

Method used

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  • Preparation method of isostatic pressing formed graphite
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  • Preparation method of isostatic pressing formed graphite

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Coal tar pitch: medium temperature pitch (produced by the coking plant of Pangang Group Co., Ltd.), its main properties are: ash content: 0.04%; volatile matter 58%; softening point 85°C; toluene insoluble content 20%; quinoline insoluble content 6 %; coking value 53%.

[0037] Aggregate: Calcined petroleum coke (produced by PetroChina Fushun Petrochemical Branch), its main properties are: ash content: 0.20%; moisture: 0.06%; volatile matter: 0.31%; true density: 2.12g / cm 3 ; Powder resistivity: 454μΩ.m; Sulfur content: 0.38%.

[0038] see figure 1 , process of the present invention is carried out according to the following steps:

[0039] a), one-time grinding

[0040] After the calcined petroleum coke is roughly crushed, it is pulverized with a Raymond mill to make coke powder with an average particle size of 10-15 μm, which is used as aggregate.

[0041] b) Coal tar pitch grinding

[0042] The raw material medium temperature asphalt is quickly ground in a ball m...

Embodiment 2

[0055] Coal tar pitch: using modified pitch (produced by the coking plant of Pangang Group Co., Ltd.), its main properties are: ash content: 0.04%; volatile matter 55%; softening point 110°C; toluene insoluble content 29%; quinoline insoluble content 8%; coking value 57%.

[0056] Aggregate: Calcined petroleum coke (produced by Sinopec Jinxi Refinery and Chemical General Plant), its main properties are: ash content: 0.26%; moisture: 0.38%; volatile matter: 0.49%; true density: 2.10g / cm 3 ; Powder resistivity: 380μΩ.m; Sulfur content: 0.34%.

[0057] see figure 1 , process of the present invention is carried out according to the following steps:

[0058] a), one-time grinding

[0059] After the calcined petroleum coke is coarsely crushed, it is pulverized by a jet mill to make coke powder with an average particle size of 10-15 μm, which is used as aggregate.

[0060] b) Coal tar pitch grinding

[0061] The raw material modified asphalt is quickly ground in a ball mill for 10...

Embodiment 3

[0075] Coal tar pitch: Medium-temperature modified pitch (produced by Shanxi Hongte Coal Chemical Co., Ltd.), its main properties are: ash content: 0.11%; volatile matter 55%; softening point 98°C; toluene insoluble content 29%; quinoline insoluble content The content is 9%; the coking value is 57%.

[0076] Aggregate: Calcined pitch coke (produced by Shanghai Baosteel Chemical Co., Ltd.), its main properties are: ash content: 0.22%; moisture: 0.13%; volatile matter: 0.44%; true density: 2.02g / cm 3 ; Powder resistivity: 584μΩ.m; Sulfur content: 0.25%.

[0077] see figure 1 , process of the present invention is carried out according to the following steps:

[0078] a), one-time grinding

[0079] After the calcined pitch coke is roughly crushed, it is pulverized with an impact mill to make coke powder with an average particle size of 10-15 μm, which is used as aggregate.

[0080] b) Coal tar pitch grinding

[0081] The raw material medium-temperature modified asphalt is qui...

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Abstract

The invention discloses a preparation method of isostatic pressing formed graphite. The preparation method comprises the following steps of: preliminarily grinding, grinding coal tar pitch and mixing the coal tar pitch powder with coke powder aggregate. According to the preparation method disclosed by the invention, the coke powder aggregate and the coal tar pitch powder are sufficiently mixed, so that the coal tar pitch powder is molten, sufficiently permeates into the air holes of the aggregate particle fine powder and can be uniformly coated on the surface of the particle fine powder during the next heating and kneading process, thereby achieving the purpose of homogenizing the material structure. The isostatic isotropic graphite material prepared by the preparation method disclosed by the invention is fine and compact in structure, good in uniformity, excellent in mechanics performance, wearable and isotropous.

Description

technical field [0001] The invention belongs to the field of preparation of graphite materials, in particular to a preparation method of isostatic graphite materials. Background technique [0002] Isostatic graphite is a new type of graphite material developed in the 1960s, which has a series of excellent properties. For example, isostatic graphite has good heat resistance. In an inert atmosphere, its mechanical strength not only does not decrease as the temperature increases, but increases, reaching the highest value at about 2500 ° C; compared with ordinary graphite, the structure Fine and dense, and good uniformity; low thermal expansion coefficient, excellent thermal shock resistance; isotropic, consistent performance in all directions; strong chemical corrosion resistance, can withstand the penetration of molten metal and glass Erosion; Good thermal conductivity and electrical conductivity; Excellent machining performance, can be processed into objects of almost any sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/205
Inventor 张士公杨栋梁马历乔
Owner SICHUAN GUANGHAN SHIDA CARBON
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