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Prepn of sulfur-free low-ash high-purity expanded graphite

An expanded graphite, high-purity technology, applied in the field of preparation of sulfur-free, low-ash, high-purity expanded graphite, can solve problems such as large water consumption, difficult cleaning, and environmental pollution

Inactive Publication Date: 2003-11-05
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These solid oxides are often not easy to clean when washing with water, and consume a lot of water, which pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After the carbon content is 99.91% natural flake graphite, nitric acid, acetic anhydride, and perchloric acid are mixed according to high-carbon natural flake graphite: nitric acid: acetic anhydride: perchloric acid = 1: 0.5: 1: 3, at a reaction temperature of 30 ° C , reacted for 30 minutes to prepare acidified graphite; acidified graphite was washed with water, dried, and the mass ratio was hydrochloric acid: hydrofluoric acid=2: 3 mixed acid was immersed in 3 times of natural flake graphite by the quality of mixed acid solution for 10 hours, After deacidification and re-drying, it is expanded at 900°C to obtain sulfur-free, low-ash, high-purity expanded graphite with an expansion volume of 200ml / g and an ash content of 395ppm.

Embodiment 2

[0021] After the carbon content is 99.95% natural flake graphite, nitric acid, acetic anhydride, and perchloric acid are mixed according to high-carbon natural flake graphite: nitric acid: acetic anhydride: perchloric acid = 1: 0.75: 1.5: 5, at a reaction temperature of 40 ° C , reacted for 60 minutes, and prepared acidified graphite; acidified graphite was washed with water, dried, and the mass ratio was hydrochloric acid: hydrofluoric acid=1: 3 mixed acid was immersed in 4 times of natural flake graphite by the quality of mixed acid solution for 12 hours, After deacidification and re-drying, it is expanded at 1000°C to obtain sulfur-free, low-ash, high-purity expanded graphite with an expansion volume of 260ml / g and an ash content of 350ppm.

Embodiment 3

[0023] After mixing natural flake graphite with a carbon content of 99.96%, nitric acid, acetic anhydride, and perchloric acid according to high-carbon natural flake graphite: nitric acid: acetic anhydride: perchloric acid: 1:1:2:7, at a reaction temperature of 50 ° C , reacted for 120 minutes, and prepared acidified graphite; acidified graphite was washed with water, dried, and the mass ratio was hydrochloric acid: hydrofluoric acid=1: 3.5 mixed acid was immersed in 5 times of natural flake graphite by the quality of mixed acid solution for 15 hours, After deacidification and re-drying, it is expanded at 1100°C to obtain sulfur-free, low-ash, high-purity expanded graphite with an expansion volume of 320ml / g and an ash content of 315ppm.

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Abstract

High-carbon natural scale graphite, nitric acid, acetate anhydride and perchloric acid in the mass ratio of 1 to 0.5-1.0 to 1-2 to 3-7 are mixed and reacted at 30-50 deg.c for 30-120 min to prepare acidified graphite. Through further water washing, drying, soaking in mixed acid of hydrochloric acid and hydrofluoric acid, deacidifying, re-drying and puffing at 900-1100 deg.c, sulfur-free, low-ashand high-purity expanded graphite is prepared. The preparation process is simple and easy to operate, and the prepared expanded graphite has ash content lower than 400 ppm.

Description

Technical field: [0001] The invention belongs to a preparation method of expanded graphite, in particular to a preparation method of sulfur-free, low-ash, high-purity expanded graphite. Background technique: [0002] Expanded graphite is an intermediate product in the manufacture of flexible graphite. It is a loose and porous worm-like substance obtained from natural flake graphite through oxidation, acidification intercalation, water washing, drying, and high-temperature expansion, also known as graphite worm. Graphite worms can be compressed into flexible graphite without adding any binder, and its strength mainly depends on the mechanical bite force generated by the worm-like expanded graphite after compression. This material not only has the excellent properties of natural graphite itself such as heat resistance, corrosion resistance, electrical conductivity, thermal conductivity, and self-lubrication, but also has properties such as light weight, softness, compressibili...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 魏兴海张金喜史景利郭全贵要立中
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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