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Preparation method of high-purity graphite

A high-purity graphite and graphite technology, applied in the field of graphite chemical industry, can solve the problems of difficulty in further improving the purity of graphite, difficult to discharge completely in time, and increase in the concentration of impurity volatiles, so as to be conducive to large-scale industrial production, strong practical promotion value, and production. Efficient effect

Active Publication Date: 2016-01-27
湖南顶立科技股份有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

[0004] However, there are several problems in the actual production process of using high temperature method to prepare high-purity graphite: First, to purify medium-carbon or high-carbon graphite to a purity of more than 99.99% in one step, the equipment needs to work continuously at a high temperature above 2600 °C5 Hours or more, higher requirements are put forward for the equipment, and the energy consumption is high; second, the purification process produces a large amount of impurity volatiles, which requires high anti-pollution ability of the equipment furnace; third, as the purification process proceeds, the impurities in the heating zone The concentration of volatiles increases and it is difficult to discharge completely and in time, which leads to the deterioration of the graphite purification environment, and it is difficult to further improve the purity of graphite

Method used

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  • Preparation method of high-purity graphite

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Experimental program
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Effect test

Embodiment 1

[0030] Follow the steps below to prepare high-purity graphite:

[0031] (1) Take graphite, grind it to a particle size of 200-300 μm, pass it into the first section of graphite purification device, and process it for 0.5h to obtain a solid product;

[0032] The treatment conditions of the first section are: temperature 2000°C, flow rate 8m 3 / h Continuously feed chlorine gas with a purity of more than 99%;

[0033] (2) The solid product obtained in step (1) is passed into the second section graphite purification device, and processed for 0.5h to obtain final product;

[0034] The treatment conditions of the second stage are: temperature 3000°C, flow rate 1m 3 / h Continuously feed chlorine gas with a purity of more than 99%.

[0035] After testing, the carbon content of the graphite after the step (1) is 99%, and the carbon content of the graphite after the step (2) is 99.99999%.

Embodiment 2

[0037] Follow the steps below to prepare high-purity graphite:

[0038] (1) Take graphite, grind it to a particle size of 200-300 μm, pass it into the first section of graphite purification device, and process it for 1 hour to obtain a solid product;

[0039] The treatment conditions of the first section are: temperature 1600°C, flow rate 8m 3 / h Continuously feed chlorine gas with a purity of more than 99%;

[0040] (2) The solid product obtained in step (1) is passed into the second section graphite purification device, and processed for 0.5h to obtain final product;

[0041] The treatment conditions of the second stage are: temperature 2600°C, flow rate 1m 3 / h Continuously feed chlorine gas with a purity of more than 99%.

[0042] After testing, the carbon content of the graphite after the step (1) is 99%, and the carbon content of the graphite after the step (2) is 99.9999%.

Embodiment 3

[0044] Follow the steps below to prepare high-purity graphite:

[0045] (1) Take graphite, grind it to a particle size of 200-300 μm, pass it into the first section of graphite purification device, and process it for 2 hours to obtain a solid product;

[0046] The treatment conditions of the first stage are: temperature 1000°C;

[0047](2) Pass the solid product of step (1) gained into the second section of graphite purification device, and process for 1h to obtain final product;

[0048] The processing conditions of the second stage are: temperature 2000°C, flow rate 2m 3 / h Continuously feed chlorine gas with a purity of more than 99%.

[0049] After testing, the carbon content of the graphite after the step (1) is 98%, and the carbon content of the graphite after the step (2) is 99.999%.

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Abstract

The invention relates to a preparation method of high-purity graphite. The preparation method of high-purity graphite includes the following steps that 1, medium-carbon or high-carbon graphite is taken, charged into a first-stage graphite extraction device and treated for 0.5-2.0 h at 1000-2000 DEG C; 2, a solid product obtained in the step 1 is charged into a second-stage graphite extraction device and treated for 0.5-1.0 h at 2000-3000 DEG C, and then high-purity graphite is obtained. By means of the preparation method of high-purity graphite, the requirements of a high-temperature method for graphite purification equipment can be lowered, and conditions can be created for industrial promotion of the high-temperature method and industrial production of high-purity graphite with the carbon content larger than 99.99%; meanwhile, the preparation method of high-purity graphite has the advantages of being high in production efficiency, low in energy consumption and the like, is beneficial for large-scale industrial production and has great practical promotion value.

Description

technical field [0001] The invention relates to the technical field of graphite chemical industry, in particular to a preparation method of high-purity graphite. Background technique [0002] High-purity graphite is graphite with a carbon content of more than 99.9%. The production of high-purity graphite is mainly to remove impurities in graphite through purification. Graphite production requires gradual purification. Generally, flotation is used as the first step of beneficiation and purification. Graphite ore can be crushed and purified to medium carbon (purity 80% to 93%) and high carbon (94% to 98%). For new energy materials for lithium-ion secondary batteries, graphene manufacturing, nano-coatings, advanced refractory materials for the metallurgical industry, military stabilizers, aerospace high-temperature-resistant materials, etc., this purity cannot meet the requirements of some occasions. [0003] The main impurity components contained in graphite are silicate mine...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 胡祥龙戴煜汤贤王艳艳
Owner 湖南顶立科技股份有限公司
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