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Preparation method and application of low-cost high-purity graphite material

A high-purity graphite, low-cost technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problem of low added value of high-purity graphite waste powder, shorten the production cycle, promote volume shrinkage, and yield high effect

Active Publication Date: 2022-07-05
重庆东攀碳材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, these graphite waste powders are mostly used as carbon brush additives, high-temperature carbon brick raw materials, anode paste raw materials and low-grade lithium battery negative electrode raw materials, etc., making the added value of high-purity graphite waste powder extremely low

Method used

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  • Preparation method and application of low-cost high-purity graphite material
  • Preparation method and application of low-cost high-purity graphite material
  • Preparation method and application of low-cost high-purity graphite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1) Purchase isostatic graphite milling waste powder and scraps from graphite processing manufacturers at a low price, remove metal impurities introduced by the powder through magnetic separation equipment, and conduct initial grinding of milling graphite waste powder through 3R Raymond mill, and then use Graphite powder with D50≤10 μm was prepared by jet mill, which was ready for use.

[0054] 2) Accurately weigh 32 parts of pitch (17 parts of modified pitch with a softening point of 109 ℃ and 15 parts of medium-temperature pitch with a softening point of 110 ℃), 62 parts of graphite powder and 5 parts of carbon black powder (N330 carbon black 2) obtained in step 1). parts, 3 parts of N234 carbon black).

[0055] 3) After mixing the graphite powder and carbon black powder uniformly, put it into the kneading pot, mix at 120 ℃ for 1 h to remove the moisture, and the kneading pot rotates at 20 r / min and rotates forward; The powder was heated to 180 °C, and the molten asph...

Embodiment 2

[0063] 1) Purchase isostatic graphite milling waste powder and scraps from graphite processing manufacturers at a low price, remove metal impurities introduced by the powder through magnetic separation equipment, and conduct initial grinding of milling graphite waste powder through 3R Raymond mill, and then use Graphite powder with D50≤10 μm was prepared by jet mill, which was ready for use.

[0064] 2) Accurately weigh 35 parts of pitch (20 parts of modified pitch with a softening point of 109 °C and 15 parts of medium-temperature pitch with a softening point of 110 °C), 65 parts of graphite powder and 8 parts of carbon black powder (N330 carbon black 5 parts) obtained in step 1). parts, 3 parts of N339 carbon black).

[0065] 3) After mixing the graphite powder and carbon powder evenly, put it into the kneading pot, mix at 120 ℃ for 1 h, remove the moisture, and the kneading pot rotates at 20 r / min and rotates forward; The powder was heated to 180 °C, and the melted asphalt...

Embodiment 3

[0073] 1) Purchase isostatically pressed high-purity graphite milling waste powder at a low price from graphite processing manufacturers, remove metal impurities introduced by the powder through magnetic separation equipment, and conduct initial grinding of milling graphite waste powder through 3R Raymond mill, and then use Graphite powder with D50≤10 μm was prepared by jet mill, which was ready for use.

[0074] 2) Accurately weigh 40 parts of pitch (28 parts of modified pitch with a softening point of 109 ℃ and 12 parts of medium-temperature pitch with a softening point of 110 ℃), 70 parts of graphite powder and 10 parts of carbon / carbon powder (N330 carbon black) obtained in step 1) 6 parts, 4 parts of nano carbon balls).

[0075] 3) After mixing the graphite powder and carbon powder evenly, put it into the kneading pot, mix at 120 ℃ for 1 h, remove the moisture, and the kneading pot rotates at 20 r / min and rotates forward; The powder was heated to 180 °C, and the melted a...

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Abstract

The invention discloses a preparation method and application of a low-cost high-purity graphite material. The preparation method comprises the following steps: pretreating waste graphite powder to obtain graphite powder of which D50 is less than or equal to 10 microns; the preparation method comprises the following steps: preparing active powder A from graphite powder, carbon / carbon powder and asphalt; then preparing active powder B from green coke and asphalt; mixing the active powder A, the active powder B and high-temperature asphalt to prepare pressed powder; a green body block is obtained through a pre-mold pressing-gradient isostatic pressing forming process; roasting the green block at 800-1200 DEG C for 2-4 hours, cooling to 200-300 DEG C, and naturally cooling to room temperature to obtain a roasted block; and placing the roasted block in a vacuum graphitization furnace for atmosphere protection, treating at 2500-2800 DEG C for 2 hours, cooling to 200-300 DEG C, and naturally cooling to room temperature to obtain the high-purity graphite material. According to the preparation method, the graphite waste powder is adopted as the aggregate, so that the raw material cost can be effectively reduced, the additional value of the high-purity graphite waste powder can be improved, dipping and repeated roasting are not needed, the preparation process is simple, the production period can be effectively shortened, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of carbon graphite materials, and particularly relates to a preparation method and application of a low-cost and high-purity graphite material. Background technique [0002] Carbon graphite is widely used in core fields such as aerospace, high-speed rail, automobile, photovoltaic, nuclear power and communication because of its light weight, high temperature self-lubrication, stable chemical properties and low expansion coefficient. Existing carbon graphite materials usually use coal tar, coal tar, etc. as binders, raw coke powder, calcined coke, delayed coke, carbon black and graphite powder as aggregates. , pressing, roasting, impregnation, multiple roasting-impregnation-re-roasting densification and graphitization purification. Multiple impregnation-calcination results in large equipment investment, high energy consumption, long production cycle and high production cost. [0003] With the continuous prog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/622C01B33/035
CPCC04B35/532C04B35/522C04B35/62204C01B33/035C04B2235/424C04B2235/422C04B2235/661C04B2235/77C04B2235/96Y02E60/10
Inventor 涂川俊刘平巩佩
Owner 重庆东攀碳材料科技有限公司
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