Method of using microcrystalline graphite to prepare expanded microcrystalline graphite

A microcrystalline graphite, graphite expansion technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low expansion ratio of expanded graphite, poor effect of expanded graphite, and high sulfur content in products. Guarantee the effect of intercalation, improve the peeling rate and the effect of cheap raw materials

Inactive Publication Date: 2017-10-24
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] However, there are only two patents related to the preparation of expanded graphite from microcrystalline graphite as raw materials: the Chinese patent application "a kind of expanded graphite environmental protection material using Kish graphite as raw material and its preparation and application" with the notification number CN103738955A reports a kind of Kish graphite Graphite is the preparation method of the expanded graphite environmental protection material of raw material; The Chinese patent application " a kind of method of preparing expanded microcrystalline graphite material with microcrystalline graphite " with notification number CN104556022A reports the preparation of expanded microcrystalline graphite material with microcrystalline graphite as raw material The method, this patent pro

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  • Method of using microcrystalline graphite to prepare expanded microcrystalline graphite

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Embodiment 1

[0035] The method of the present invention for preparing expanded microcrystalline graphite material using microcrystalline graphite includes the following steps: a graphite expansion furnace is included, and a high temperature expansion method is adopted, including the following steps:

[0036] S1. Take the microcrystalline graphite raw material with 70% carbon content, crush and grind it to a particle size of 300 mesh microcrystalline graphite powder;

[0037] S2. Place the microcrystalline graphite powder obtained in step S1 with perchloric acid and potassium permanganate in a reaction device for the first chemical intercalation treatment to obtain an acidic suspension of expandable microcrystalline graphite. The acidic suspension is filtered, and the filtrate is retained for later use. Among them, the specific steps of the first chemical intercalation are: S21. Mix perchloric acid and microcrystalline graphite powder at a liquid-to-solid ratio of 10:1L / Kg and stir evenly; S22. ...

Embodiment 2

[0042] The steps of this embodiment are basically the same as those of embodiment 1, and the differences are:

[0043] S1. Take the microcrystalline graphite raw material with 70% carbon content, crush and grind it to a particle size of 300 mesh microcrystalline graphite powder;

[0044] S2. Place the microcrystalline graphite powder obtained in step S1 with perchloric acid and potassium permanganate in a reaction device for the first chemical intercalation treatment to obtain an acidic suspension of expandable microcrystalline graphite. The acidic suspension is filtered, and the filtrate is retained for later use. The specific steps of the first chemical intercalation are: S21. Mix perchloric acid and microcrystalline graphite powder at a liquid-to-solid ratio of 15:1L / Kg and stir evenly; S22. Add the strong oxidant according to the mass ratio of the microcrystalline graphite powder to the strong oxidant of 4:1. After stirring evenly at room temperature, the temperature is raised ...

Embodiment 3

[0048] The steps of this embodiment are basically the same as those of embodiment 1, and the differences are:

[0049] S1. Take the raw material of microcrystalline graphite with a carbon content of 75%, crush and grind it to a particle size of 350 mesh microcrystalline graphite powder;

[0050] S2. Place the microcrystalline graphite powder obtained in step S1 with perchloric acid and potassium permanganate in a reaction device for the first chemical intercalation treatment to obtain an acidic suspension of expandable microcrystalline graphite. The acidic suspension is filtered, and the filtrate is retained for later use. The specific steps for the first chemical intercalation are: S21. Mix perchloric acid and microcrystalline graphite powder at a liquid-solid ratio of 20:1L / Kg and stir evenly; S22. Add the strong oxidant according to the mass ratio of the microcrystalline graphite powder to the strong oxidant of 6:1, stir evenly at room temperature, and then heat to 50℃ and conti...

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Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a method of using the microcrystalline graphite to prepare expanded microcrystalline graphite. The method includes: using microcrystalline graphite as a raw material, and performing chemical intercalation treatment for the first time to obtain primary expandable microcrystalline graphite; performing chemical intercalation treatment on the primary expandable microcrystalline graphite for the second time to obtain secondary expandable microcrystalline graphite; adopting a high-temperature expanding method to expand the secondary expandable microcrystalline graphite in a graphite expanding furnace at 900 DEG C to obtain the expanded microcrystalline graphite. By the method, 200-260-multiple secondary expanded microcrystalline graphite materials which are high in multiple, sulfur-free and short in production period can be prepared on a large scale.

Description

Technical field [0001] The invention belongs to the technical field of material preparation, and more specifically, relates to a method for preparing expanded microcrystalline graphite from expanded graphite. Background technique [0002] Expanded graphite is a carbon material. Using expandable graphite as raw material, when processed at high temperature (usually 700~1200℃), the substance inserted between the layers of expanded graphite decomposes rapidly, and the generated gas forms a high pressure in the interlayer of expandable graphite and is high in the c-axis direction. Expansion, the bulk density changes from 0.7~1.8g / cm3 to 0.003~0.03g / cm3, and the expansion ratio reaches tens to hundreds of times. Due to its loose structure, porous and worm-like structure, large surface area and high surface energy, expanded graphite has excellent liquid phase adsorption performance, good plasticity, good flexibility, ductility and sealing, so it is widely used in environmental protecti...

Claims

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Application Information

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IPC IPC(8): C01B32/225
CPCC01P2006/12C01P2006/17C01P2006/40
Inventor 林前锋李丽萍
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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