Graphite purification method and purification device

Abstract

The invention discloses a graphite purification method and a purification device. The purification method is applied to the purification device. The purification method specifically comprises the steps that graphite powder to be purified is placed in a high-temperature environment generated by arc discharge plasma, high-oxidation or reducibility active particles generated in the reaction gas discharge process are used for colliding with impurities in graphite, the activation energy of impurities in the graphite is effectively reduced, the impurities are activated to generate a gas-phase or condensed-phase substance with a lower boiling point and vaporize, so that the purification of the graphite is realized, and inert gas is adopted as a working medium in the whole purification process; according to the graphite purification method and the purification device, on one hand, part of impurities can directly overflow under the condition that plasma flames are high in temperature; meanwhile, the injection of active particles generated in the discharge process of the plasma reaction gas causes the change of impurities to form a new compound or change the valence order so that the removal is convenient.

Description

technical field [0001] The invention relates to the technical field of graphite purification, in particular to a graphite purification method and a purification device. Background technique [0002] Graphite is known as "black gold" and is a strategic resource. It has the characteristics of high temperature resistance, corrosion resistance, good thermal conductivity and high chemical stability. Its application scope covers core fields such as metallurgy, electronics, sealing, chemical industry, national defense, aerospace, military industry, and people's livelihood. play an important role. [0003] At present, there are mainly two types of graphite purification processes: wet purification and pyrolysis. The preferred method for preparing ultra-pure graphite is the high-temperature impurity removal method in the pyrolysis method. The carbon content of graphite purified by this method is as high as 99.995% or more. The product has a very high carbon content. However, the ma...

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Problems solved by technology

However, the main disadvantage of this method is that it needs to design and build a high-temperature furnace, the equipment is expensive, the one-time investment is large, the energy consumption is large, the environmental friendliness is poor, and the cost is high.

In addition, other graphite purification processes also have problems such as acid-base corrosion reaction equipment, purification by-products or reaction reagents that pollute the environment, and large energy consumption in the purification process.

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