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A method for preparing high-purity low-sulfur expanded graphite

A technology of expanded graphite and high-purity graphite, applied in the electrolysis process, electrolysis components and other directions, can solve the problems of high production cost and low product purity, and achieve the effects of low production cost, simple method and low pollution

Inactive Publication Date: 2011-12-21
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems of low product purity and high production cost in the existing chemical method for preparing expanded graphite; and provides a method for preparing high-purity and low-sulfur expanded graphite

Method used

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specific Embodiment approach 1

[0012] Specific embodiment one: the method for preparing high-purity low-sulfur expanded graphite in this embodiment is carried out according to the following steps:

[0013] 1. Put the phosphorus flake graphite in the graphitization furnace, heat it to 2800°C, keep it warm for 2 hours, then introduce chlorine gas, and continue heating until the carbon content is ≥ 99.9% (mass), to obtain the phosphorus flake high-purity graphite;

[0014] 2. Put the phosphorus flake high-purity graphite obtained in step 1 into a polypropylene mesh bag, then soak in peroxide water for 24 hours, and then lift it up to drench;

[0015] 3. After soaking in peroxide water, the polypropylene mesh bag containing phosphorus sheet high-purity graphite is used to wrap the graphite block as an anode, put it into the graphite electrolytic cell, and then inject the electrolyte, which is composed of ammonium salt solution and acid Prepared, with graphite as the cathode, and then at a current density of 0.1...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 3, the mass ratio of the phosphorus flake high-purity graphite to the ammonium salt is 1:1.5-4.5. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step three, the mass ratio of the phosphorus flake high-purity graphite to the ammonium salt is 1:2-4. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing high-purity low-sulfur expanded graphite, which belongs to the preparation method of expanded graphite. The existing chemical method of the present invention to prepare expanded graphite has the technical problems of low product purity and high production cost. The method of the present invention: 1. high-temperature purification of phosphorus flake graphite; 2. putting it into a polypropylene mesh bag, soaking it in peroxide water, and lifting it to pour water; 3. wrapping the graphite block with a polypropylene mesh bag as an anode, and putting In the graphite electrolytic cell, then inject the electrolyte solution, use graphite as the cathode, and then electrolyze. During the electrolysis process, the polypropylene mesh bag is inflated and stirred; 4. Constant temperature drying and expansion; that is, high-purity low-sulfur expanded graphite is obtained. The method of the invention is simple and easy to operate, and the degree of intercalation can be controlled by adjusting the current intensity and electrolysis time, and the prepared high-purity expanded graphite is low in sulfur, and there is no pollution to the water body during the washing process, and no other impurities are doped in the product. The invention uses a small amount of oxidant to trigger, little or almost no pollution in production, and relatively low production cost.

Description

technical field [0001] The invention belongs to a preparation method of expanded graphite. Background technique [0002] Expanded Graphite (Expanded Graphite) is a branch of pure graphite. Under the instantaneous high temperature of Expanded Graphite, the interlayer inserts decompose and gasify rapidly, resulting in an expansion far greater than the bonded molecular force between graphite layers. The thrust makes the graphite expand violently along the C-axis direction between the layers, up to dozens or even hundreds of times, thus forming a loose and porous worm-like substance. Expanded graphite has a unique and abundant network microporous structure on the surface and inside, and at the same time has the characteristics of nanoparticles on the structural scale, so it has better performance than natural flake graphite. Expanded graphite not only retains the properties of natural graphite such as high temperature resistance, corrosion resistance, low friction coefficient, ...

Claims

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Application Information

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IPC IPC(8): C25B1/00
Inventor 张海军孟凡娜赵国刚
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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