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Purification method of natural graphite

A purification method and natural graphite technology, applied in the field of natural graphite purification, can solve the problems of product purity to be improved, difficulty in mass production, waste of resources, etc., and achieve the effects of complete dissolution of impurities, reduction of pollution, and reduction of raw material costs.

Pending Publication Date: 2022-05-10
杨德俊
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  • Claims
  • Application Information

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Problems solved by technology

But if this method only adopts one-time pickling and impurity removal reaction, the purity of the product needs to be improved; if multi-stage pickling reaction is adopted, although the requirement of purity is met, it needs to use multiple times of hydrofluoric acid and other acids. After being used once in high-grade pickling, it will be treated as waste liquid, and the resources cannot be used rationally, resulting in waste of resources; at the same time, a large amount of high-concentration acid waste water must have a high-standard waste water treatment system, which will lead to cost increase, difficult to mass-produce

Method used

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  • Purification method of natural graphite

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: a kind of operation graphite purification method that adopts multistage countercurrent reaction, concrete technical scheme is as follows:

[0021] Select Lutang graphite powder raw material in Chenzhou City, Hunan Province, with a carbon content of 74.8%;

[0022] 1) Add the graphite powder raw material from the first-stage reaction kettle, add the centrifuged liquid separated from the second stage according to the liquid-solid volume ratio of 2:1, and stir for 2.0 hours under normal pressure and temperature of 70°C to obtain acid leaching Graphite; the liquid after centrifugation of acid-leached graphite is waste liquid, which enters the waste liquid recovery unit;

[0023] 2) Put the solid matter after the first-stage centrifugation into the second-stage reaction kettle to remove impurities; add the centrifuged liquid separated from the third stage according to the liquid-solid volume ratio of 2:1, and stir under normal pressure and temperature at 70°C ...

Embodiment 2

[0025] Embodiment 2: Compared with Embodiment 1, the reaction order is 4, and other conditions are all the same.

Embodiment 3

[0026] Embodiment 3: Compared with Embodiment 1, the mass concentration of hydrofluoric acid added in the fresh acid is 20%, and other conditions are all the same.

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Abstract

The invention relates to a purification method of natural graphite. The graphite is purified by adopting an operation process flow of multistage countercurrent reaction. The graphite powder raw materials participating in the reaction are subjected to purification and impurity removal stage by stage from the first stage; the mixed acid used for impurity removal is added from the last stage, the mixed acid used for purification and impurity removal of the previous stage is returned from the residual liquid obtained after purification and impurity removal of the next stage, and the residual liquid obtained after acid leaching of the first stage is used up is used as waste liquid and enters a waste liquid recovery unit. The method has the characteristics of low acid consumption, environment friendliness and high purification efficiency.

Description

technical field [0001] The invention relates to the technical field of natural graphite purification, in particular to a natural graphite purification method, which uses less acid to purify the natural graphite, causes less environmental pollution and has high purification efficiency. [0002] technical background [0003] Graphite is a high-energy crystalline carbon material with a unique structure and good properties such as high temperature resistance, heat conduction, lubrication, thermal shock resistance, and good chemical stability. Therefore, it is widely used in metallurgy, chemical industry, oil refining, machinery, light industry, Electronics, aerospace and nuclear industries have become an indispensable non-metallic material in modern industrial technology. my country is a country with a large amount of natural graphite resources, and its reserves, output and export volume rank first in the world. However, the level of deep processing of graphite products is low, m...

Claims

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Application Information

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IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 段艳刘晶孙化鹏邓斌杨德俊
Owner 杨德俊
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