Graphite purification method

Abstract

The invention discloses a graphite purification method which comprises the following steps: S1, preparing graphite powder, uniformly mixing the graphite powder, screening, and performing impurity removal treatment so as to obtain a graphite powder raw material to be purified; S2, spreading the graphite powder raw material to be purified on a heating platform so as to form a graphite powder material layer; S3, setting a laser emitter above the heating platform, performing continuous transverse scanning on the graphite powder material layer by using the laser emitter, performing radiation heating, and gasifying impurities in the graphite powder raw material; S4, cooling, thereby obtaining graphite of which the solid carbon content is 99.9-99.99%. By adopting a laser radiation heating method,impurities of the graphite powder raw material are volatilized in a gas mode on premise that the graphite self is not affected, high-purity graphite is obtained, energy consumption and cost are greatly reduced, in addition, the laser heating temperature is up to 3000 DEG C or greater, impurities can be effectively and rapidly gasified, and the purification efficiency is improved.

Description

technical field [0001] The invention relates to a method for purifying graphite. Background technique [0002] Graphite is a crystalline mineral of carbon. It is an allotrope with diamond. It is known as "black gold" and is a very important mineral material. High-purity graphite refers to graphite with a carbon content greater than 99.99%. It has the advantages of high strength, good thermal shock resistance, high temperature resistance, oxidation resistance, and small resistivity. It is widely used in metallurgy, chemical industry, aerospace, electronics, machinery, and nuclear energy. and other industrial fields. The continuous development of the industry has higher and higher requirements on the purity of graphite, and the efficient and energy-saving preparation of high-purity graphite plays an important role in improving the utilization value of graphite. [0003] At present, the means of graphite purification mainly include: flotation method, alkali acid method, hydro...

AI Technical Summary

Problems solved by technology

However, the high-temperature method requires high equipment, resulting in disadvantages such as high investment and production costs. In addition, the huge energy consumption and low output of the high-temperature method make the application of this method extremely limited, and it cannot achieve long-term continuous mass production.