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Preparation method of high-performance special graphite

A special graphite and high-performance technology, applied in the field of preparation of high-performance special graphite, can solve the problems of excessive asphalt, insufficient mixing and coating of raw material powder and asphalt, etc., and achieve the effect of reducing the amount of asphalt, improving performance and saving costs.

Active Publication Date: 2022-02-01
SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for preparing high-performance special graphite to solve the problems of insufficient uniform kneading and coating of raw material powder and asphalt and excessive asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of the high-performance special graphite provided by the invention comprises:

[0028] Grind the calcined petroleum coke first, and sieve it into different particle sizes. Preferably, sieve out four particle size materials smaller than 0.074mm, 0.074-0.15mm, 0.15-0.5mm, and 0.5-1.0mm, and weigh each particle size An appropriate amount of raw material powder should be mixed evenly. Under the preferred sieving scheme above, the weighed raw material powder should be 50-70 parts of 0.074mm grade, 10-30 parts of 0.074-0.15mm grade, 0.15-0.5 10-20 copies for mm grade, 5-10 copies for 0.5-1.0mm grade;

[0029] Choose medium-temperature coal tar pitch as the binder and heat it to melt. The softening point is preferably 100-200°C, and the melting temperature is preferably 150-280°C. Preheat the raw material powder to reduce the polymerization effect between particles, so that as much granular material as possible The surface is coated with asphalt, and th...

Embodiment 1

[0036] (1) Raw material preparation: Grind the calcined petroleum coke and sieve it into four grades of materials less than 0.074mm, 0.074-0.15mm, 0.15-0.5mm, and 0.5-1.0mm, and take 50% of each of the four grades of materials , 30, 20, 10 copies.

[0037] (2) Asphalt coating: Mix the petroleum coke powder evenly and preheat to 150°C, and melt the asphalt at 200°C. The raw material powder and asphalt liquid are sprayed through the nozzles respectively, keeping the two spray directions at an angle of 50° with the ground, and the coated raw material powder is collected as paste for later use;

[0038] (3) Paste processing: put the paste in a ball mill and grind it for 5 minutes, take out the material, and then air-select in a wind-selection machine with a wind speed of 10m / s to obtain paste powder with a larger specific gravity.

[0039] (4) Molding: Mix the paste powder obtained by winnowing, and place it in a rubber suit for isostatic pressing. The molding pressure is 180 MPa...

Embodiment 2

[0043] (1) Raw material preparation: Grind the calcined petroleum coke and sieve it into four grades of materials less than 0.074mm, 0.074-0.15mm, 0.15-0.5mm, and 0.5-1.0mm, and take 70% of each of the four grades of materials , 15, 10, 5 copies.

[0044] (2) Asphalt coating: Mix the petroleum coke powder evenly and preheat to 200°C, and melt the asphalt at 250°C. The raw material powder and asphalt liquid are sprayed through the nozzles respectively, keeping the two spray directions at an angle of 60° with the ground, and the coated raw material powder is collected as paste for later use;

[0045] (3) Paste processing: put the paste in a ball mill and grind it for 8 minutes, take out the material, and then wind-select in a wind-separation machine with a wind speed of 20m / s to obtain paste powder with a larger specific gravity.

[0046] (4) Press molding: mix the paste powder obtained by winnowing, put it in a rubber suit and press it isostatically, the molding pressure is 22...

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Abstract

The invention discloses a preparation method of high-performance special graphite, and relates to the technical field of graphite preparation. The invention aims to solve the problems that raw material powder and asphalt are not uniformly mixed, kneaded and coated enough and the asphalt is excessive. The method comprises the following steps: grinding calcined petroleum coke, conducting screening to obtain ground calcined petroleum coke with different particle sizes, weighing a proper amount of raw material powder of each particle size, and carrying out uniform mixing; selecting medium-temperature coal pitch as a binder; preheating the raw material powder, melting the medium-temperature coal pitch, respectively spraying the raw material powder and the pitch through two nozzles, enabling the raw material powder to penetrate through a pitch spraying path and fall out of the end point of the pitch spraying path, enabling the surface of the raw material powder to be coated with the pitch, respectively collecting the redundant pitch and the raw material powder coated with the pitch, and carrying out cooling to obtain a paste material; and grinding, winnowing and briquetting the paste, and sequentially performing primary roasting, dipping, secondary roasting and graphitization to obtain a graphite product. According to the invention, the coating effect of the raw material powder and the pitch is good, product performance is excellent, and pitch consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of graphite preparation, in particular to a preparation method of high-performance special graphite. Background technique [0002] Special graphite refers to high-strength, high-density, high-purity graphite products, which are widely used in metallurgy, chemical industry, aerospace, electronics, machinery, nuclear energy and other industrial fields. In some special fields, especially high requirements are put forward for special graphite. Traditional graphite production methods are difficult to meet the requirements and need to be improved in some aspects. [0003] The production process of graphite mainly includes raw material grinding, kneading, rolling, paste grinding, multiple roasting, impregnation, graphitization, etc., for example, the publication number is CN101823707A, and the name is "A Process for Producing Isostatic Graphite" Such a method is disclosed in the invention patent of China; but the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/532C04B35/622C04B35/626
CPCC04B35/532C04B35/522C04B35/622C04B35/62605Y02E60/10
Inventor 李涛谢霭祥欧阳建涛鲍思凯
Owner SINOSTEEL NANJING NEW MATERIALS RES INST CO LTD
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