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Low-cost large-scale production process for high-mesh sulfur-free expanded graphite

A technology of expanded graphite and production process, which is applied in the low-cost mass production process of high-mesh sulfur-free expanded graphite, which can solve the problems of high residual sulfur in worms, toxic pollutants, and inability to apply high-end applications sensitive to sulfur content. Achieve the effect of high mesh number and low preparation cost

Inactive Publication Date: 2018-05-29
苏州鼎烯聚材纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the usual preparation method, sulfuric acid is commonly used as the expanded graphite intercalation agent, and the expansion factor is relatively large, even reaching more than 500 times. However, acidic sulfur oxide and toxic pollutants are produced during the high-temperature expansion process of this method, and additional desulfurization is required. Equipment, prepared worms with high residual sulfur, even with low-sulfur formulations and processes, the sulfur content often exceeds 500ppm, which cannot be applied to high-end applications that are sensitive to sulfur content, such as batteries, conductive inks, sealing gaskets, precious metals and high-purity alloys Metallurgical crucibles, magnesia carbon bricks, etc., are greatly limited in application

Method used

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  • Low-cost large-scale production process for high-mesh sulfur-free expanded graphite
  • Low-cost large-scale production process for high-mesh sulfur-free expanded graphite
  • Low-cost large-scale production process for high-mesh sulfur-free expanded graphite

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Experimental program
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Effect test

Embodiment 1

[0045] 1) Acid activation of graphite: Put 1 part of 150-mesh flake graphite powder dried at 60°C with a carbon content greater than 99% into a heated and cooled enamel jacketed reactor, cool to 5°C, and then add the same 5°C Mix 0.25 parts of 30% hydrogen peroxide evenly, and then add 2.1 parts of 65% nitric acid at the same concentration of 5°C and mix evenly. After mixing for 30 minutes, raise the temperature to 35°C and keep for 60 minutes, then move the slurry to a centrifuge at a high speed of more than 50g Spin deacidification.

[0046]2) Organic acid intercalation: Put the graphite wet powder treated by acid oxidation activation back into the same reaction kettle, add 2.5 parts of mixed acid (the weight ratio of formic acid is 50%, acetic acid 45%, citric acid 5%), and mix well , heated up to 40°C and maintained for 90 minutes, cooled to room temperature, moved the slurry to a high-speed centrifuge, and deacidified by centrifuging at a high speed of more than 50g.

[...

Embodiment 2

[0049] 1) Acid activation of graphite: Put 1 part of 150-mesh flake graphite powder dried at 60°C with a carbon content greater than 99% into a heated and cooled enamel jacketed reactor, cool to 3°C, and then add the same 3°C 50% hydrogen peroxide 0.2 and mix evenly, then add 1.75 parts of 85% nitric acid with the same low concentration of 3°C and mix evenly, after mixing for 30 minutes, raise to 35°C and keep for 60 minutes, then move the slurry to a centrifuge, at a high speed of more than 50g Spin deacidification.

[0050] 2) Organic acid intercalation: Put the graphite wet powder treated by acid oxidation activation back into the same reaction kettle and add 3 parts of mixed acid solution (the weight ratio of formic acid is 40%, acetic acid 57%, citric acid 3%), mix Evenly, heat up to 30°C and keep for 20 minutes, continue to heat up to 50°C and keep for 90 minutes, then cool to room temperature, move the slurry to a high-speed centrifuge, and deacidify by centrifuging at ...

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Abstract

The invention relates to the technical field of preparation of expanded graphite, in particular to a low-cost large-scale production process for high-mesh sulfur-free expanded graphite. The low-cost large-scale production process for high-mesh sulfur-free expanded graphite particularly comprises the following steps: (1) acid activation of graphite: fully oxidizing high-mesh flake graphite powder with hydrogen peroxide and concentrated nitric acid in a kettle at the temperature lower than 15 DEG C, and deacidifying to obtain acidized graphite; (2) organic acid intercalation: adding organic acidin the acidized graphite, carrying out intercalation reaction, and deacidifying; and (3) cleaning and drying: adding cleanout fluid, and after cleaning, removing the cleanout fluid; feeding graphitewet powder into continuous drying equipment and drying to obtain the product. The expanded graphite prepared by the method is high in expansion times, does not contain sulfur, is low in preparation cost, and can be applied to large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of expanded graphite, in particular to a low-cost large-scale production process of high-mesh sulfur-free expanded graphite. Background technique [0002] Expanded graphite is the raw material for preparing graphite worms by heating at high temperature, and it is also used as a flame retardant for plastics. Graphite worms are important raw materials for the production of graphene, various flexible graphite products, various high specific surface area and high aspect ratio powders, and ultra-thin graphite electrodes. High-purity graphite worms are the basis for the production of high-purity graphene. [0003] The preparation of expanded graphite usually uses large flake graphite as raw material, and the mesh size of the final product is generally less than 80 mesh. High mesh flake graphite is difficult to realize valuable applications due to its extremely small expansion multiple. Due to the l...

Claims

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Application Information

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IPC IPC(8): C01B32/225
CPCC01B2204/32C01P2004/01C01P2004/61
Inventor 邓超然寇亚虎张亚妮
Owner 苏州鼎烯聚材纳米科技有限公司
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