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Method for preparation of high-purity flake graphite by using plasma sintering process

A plasma and flake graphite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as high energy consumption and high pollution, and achieve the effect of low energy consumption

Inactive Publication Date: 2014-02-05
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the technical problems of high pollution and high energy consumption in the existing method for preparing high-purity flake graphite,

Method used

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  • Method for preparation of high-purity flake graphite by using plasma sintering process
  • Method for preparation of high-purity flake graphite by using plasma sintering process
  • Method for preparation of high-purity flake graphite by using plasma sintering process

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specific Embodiment approach 1

[0014] Specific embodiment one: the method for preparing flake graphite by plasma sintering method in the present embodiment is as follows:

[0015] 1. Put 5g of natural graphite with a particle size of 10-200μm and a purity of ≥90% into a quartz tube, raise the temperature of the quartz tube to 500°C at a rate of 5-10°C / min, and flow nitrogen gas at a rate of 5L / min at the same time , and kept at 500°C for 1 hour to obtain heat-treated graphite;

[0016] 2. Mix 200-500mL of absolute ethanol with 0.5-1g of NaOH, then add heat-treated natural graphite, and ball mill and mix for 12-24 hours to obtain the mixture;

[0017] 3. Dry the mixture under vacuum conditions at 60-90°C for 6-12 hours, then place it in a graphite mold, and put the graphite mold into a discharge plasma sintering furnace. Raise the temperature to 1800-2400°C, keep it warm for 5-10 minutes, and cool down to obtain high-purity flake graphite.

[0018] During the ball milling process in Step 2 of this embodime...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the temperature is raised to 500°C at a rate of 6-9°C / min. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, the temperature is raised to 500° C. at a rate of 8° C. / min. Others are different from the first or second specific embodiment.

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Abstract

The invention relates to a method for preparation of high-purity flake graphite, discloses a method for preparation of the high-purity flake graphite by using a plasma sintering process, and solves the technical problems of high pollution and high energy consumption of methods in the prior art for preparation of the high-purity flake graphite. The method comprises the following steps: 1, mixing absolute ethanol with NaOH, then adding thermally treated natural graphite, mixing by ball milling, drying the mixture, then placing in a graphite mold, putting the graphite mold in a discharge plasma sintering furnace, under the condition of vacuum, heating and keeping warm, cooling to obtain the high-purity flake graphite. The method uses a conductive characteristic of the natural flake graphite, uses a plasma heating mode, and heats inside the flake graphite to instantaneously motivate graphite reaction activity, so that the inter-layer NaOH and in-layer impurities are fully reacted, impurity by-products are volatilized at high temperature for further preparation of the high-purity natural flake graphite. The method is low in energy consumption and free of pollution, the purity of the obtained flake graphite is >=99.9%. The method belongs to the field of preparation of the high-purity flake graphite.

Description

technical field [0001] The invention relates to a preparation method of high-purity flake graphite. Background technique [0002] Due to its excellent thermal conductivity, electrical conductivity, good adsorption performance and thermal shock resistance and many other novel properties, high-purity graphite has aroused great interest of scholars. At present, the preparation methods of high-purity natural flake graphite mainly focus on the traditional alkali-acid chemical method and high-temperature physical method. The advantage of the traditional alkali-acid chemical method is that the equipment is simple and easy to operate, but the purity of graphite is difficult to meet the high-purity requirements, the reaction process is seriously polluted, and there are many solid by-products, which are difficult to clean up, affect product quality, and are difficult to control the "three wastes" in the reaction process emissions pollute the environment. The high-temperature physica...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/205
Inventor 张海军赵国刚张海礁吴岩
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY