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A graphite purification and graphite technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of reducing the reaction efficiency of reaction components and impurities, increasing cost and environmental protection pressure, and high energy consumption
Pending Publication Date: 2020-10-20
HARBIN UNIV OF SCI & TECH
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[0003] The purpose of the present invention is to solve the existing method of purifying graphite to a purity of more than 99.99%, high energy consumption, and the continuous passage of gas, which reduces the reaction efficiency of reaction components and impurities, and causes a lot of waste of atmosphere and cost and The technical problem of the increase of environmental protection pressure, a graphite purification method is provided
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specific Embodiment approach 1
[0020] Specific embodiment one: present embodiment graphite purification method is as follows:
[0021] 1. Spread medium-carbon graphite or high-carbon graphite in the graphite crucible, then move it to a high-temperature purification furnace (manufactured by Zhuzhou Guangjichang Technology Co., Ltd., model: GJC-TCL-400 horizontal high-temperature furnace), and close the furnace body After that, start the vacuum pumping system until the absolute vacuum reaches 10pa~100pa;
[0022] 2. Raise the temperature to 800°C~1000°C, then keep it warm for 0.5h~1h, and at the same time keep warm, pass carbon tetrachloride at a flow rate of 0.5L~1.5L / h;
[0023] 3. Raise the temperature to 1200°C-1450°C, then keep it warm for 1h-1.5h, while keeping warm, alternately feed carbon tetrachloride and argon gas with a purity of 99.999% into the furnace, and the flow rate of carbon tetrachloride is 0.5L- 1.5L / h, the flow rate of high-purity argon gas is 2-3m 3 / h;
[0024] The method of introdu...
specific Embodiment approach 2
[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that the heating rate in Step 1, Step 2 and Step 3 is 15° C. / min. Others are the same as the first embodiment.
specific Embodiment approach 3
[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, the temperature is raised to 800°C, and then kept for 0.5h, and carbon tetrachloride is introduced at a flow rate of 0.5L / h while keeping warm. Others are the same as those in Embodiment 1 or 2.
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Abstract
The invention discloses a graphite purification method, belonging to the technical field of graphite purification. The invention aims to solve the technical problems that an existing method is high energy consumption during purification of graphite to a purity of 99.99% or more and the mode of continuous passing of gas reduces the reaction efficiency of reaction components and impurities and causes wasting of a large amount of atmosphere and increase in cost and environmental protection pressure. The graphite purification method comprises the following steps: carrying out heating to 800-1000 DEG C under the absolute vacuum degree of 10-100 pa, and introducing carbon tetrachloride while keeping the temperature; raising the temperature to 1200-1450 DEG C, keeping the temperature, and alternately introducing carbon tetrachloride and argon; raising the temperature to 1600-1800 DEG C, keeping the temperature, and alternately introducing carbon tetrachloride and argon. According to the method, the consumption of a graphite purification device and energy sources by a conventional high-temperature method can be reduced, the graphite purification temperature is reduced to be within 1800 DEGC and below 2000 DEG C, the utilization rate of carbon tetrachloride and the discharge efficiency of impurity volatile matters can be effectively improved by alternate introduction and exhausting, and the method has the advantages of simple process, high production efficiency, environmental protection and energy conservation.
Description
technical field [0001] The invention relates to a graphite purification method, which belongs to the technical field of graphite purification. Background technique [0002] Graphite has many advantages such as low density, corrosion resistance, radiation resistance, self-lubrication, high and low temperature resistance, etc. It has important application value in aerospace, military industry, electronics, nuclear energy, metallurgy and other fields. With the rapid development of modern science and technology, many industries have put forward higher requirements for the purity of graphite materials. The purity of graphite determines the use characteristics and comprehensive performance of graphite materials. The higher the purity of graphite, the higher the application value. High-purity graphite refers to graphite with a fixed carbon content of more than 99.9%. The production of high-purity graphite is mainly to remove impurities in graphite through a purification process. T...
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