Preparation technique for purifying graphite by high temperature method

Abstract

The invention belongs to the technical field of extracting graphite, and mainly relates to a preparation process for purifying the natural graphite by a high-temperature method. The preparation process for purifying the natural graphite comprises a technical proposal that by utilizing the principle that the boiling point of the graphite is high (3,700 DEG C) and the boiling point of other impurities is low, the impurities in the natural graphite are continuously removed by stages. The process comprises the following steps that: the natural graphite is placed in purification furnaces with temperatures of 1,500 DEG C, between 2,500 and 2,800 DEG C and between 2,800 and 3,200 DEG C for gasifying the impurities by stages, and simultaneously proper amount of HF and HCL gases are introduced; at high temperature, the introduced HF and HCL gases perform displacement reaction with the metal impurities with high boiling point to generate fluorides and chlorides with low boiling point which are gasified for discharge. The carbon content of the natural graphite purified by the process reaches 99.99 to 99.999 percent, and the process also has the advantages of simple production process, low production cost and stable quality.

Description

1. Technical field [0001] The invention belongs to the technical field of graphite extraction, and mainly relates to a preparation process for purifying natural graphite by a high-temperature method. 2. Background technology [0002] With the increasing demand for high-purity graphite in my country, graphite purification technology has been highly valued by domestic experts and scholars, and a lot of manpower and material resources have been invested in research. At present, domestic graphite purification methods include chemical wet method, chemical dry method, and chemical wet method (strong acid or strong alkali) purification process, which can be produced in small quantities. However, in industrial production, it is difficult to control the ratio of acid and alkali, poor adaptability to raw ore components, poor quality stability, high production cost, and large environmental pollution, so it does not meet the requirements of mass production. Chemical dry purification of...

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Problems solved by technology

However, in industrial production, due to the difficulty in controlling the ratio of acid and alkali, poor adaptability to raw ore components, poor quality stability, high production costs, and large environmental pollution, it does not meet the requirements of mass production.

Chemical dry purification of graphite is to use active gas (such as chlorine gas) to pass through hot graphite to make impurities into steam compounds with pressure, so as to eliminate them. Due to the large consumption of chlorine gas, it is easy to cause chlorine gas leakage and poisoning, which is harmful to the environment and people. It is very threatening, and it adopts periodic furnace production, the labor intensity of workers is high, the output is low, and the production cost is too high

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