Purification method for high-purity natural graphite

A natural graphite and purification method technology, applied in the field of graphite purification, can solve problems such as environmental pollution, waste of power resources, high cost, etc., and achieve the effects of reducing production costs, saving production costs, and high production efficiency

Active Publication Date: 2011-04-06
LUOYANG GUANQI INDAL & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite is used as an industrial raw material, especially in some special industries and high-tech industries such as atomic energy industry, automobile industry, aerospace technology, biotechnology, etc., not only requires extremely high carbon content of graphite, but also requires that graphite should not contain too much Trace elements must be high-purity graphite above 99.9%. However, the carbon content of general natural graphite cannot meet the requirements of these industries for high-purity graphite. Therefore, natural graphite must be purified
The current purification method for natural graphite is still to use the high temperature resistance of graphite to improve the purity of graphite by high temperature electrothermal method. Due to the complexity of this process, it is necessary to build a large electric furnace, which is a serious waste of power resources. At the same time, it is necessary to continuously feed inert gas. costly
It is especially important that when the purity of graphite reaches 99.93%, the limit has been reached, and the fixed carbon content of graphite cannot be continuously increased.
Chinese patent application number 200410015267.4 discloses a method for purifying natural flake high-purity graphite, using oxidant and complexing agent to purify natural flake graphite under high temperature conditions, the product purity of this purification method is low, and the recovery efficiency of graphite is also low
Chinese patent application No. 94105051.3 discloses the chlorination purification process of natural graphite. This process uses the chlorine gas and the bulk material la...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of purification method of high-purity natural graphite, its purification step is:

[0031] Step 1, get the graphite 400kg that carbon content is 60%, put into reactor 1, add the EDTA of 30kg, the hydrofluoric acid of 50kg successively by the weight percentage of graphite (the concentration of hydrofluoric acid is 40%) , 2kg of nitric acid (the concentration of nitric acid is 98%) and the hydrochloric acid of 80kg (the concentration of hydrochloric acid is 30%), then add the water of 100L, stirring speed is 200 revs / min, stirring time 20 minutes;

[0032] Step 2, heat up reaction, open the temperature control device on the reactor I, make the temperature in the reactor I rise to 85°C, react at this temperature for 4 hours, stir once every 50 minutes during the reaction, and the stirring time each time 3 minutes, the stirring speed was 200 rpm, after the reaction was completed, it was left to stand for 3 hours, and the tail gas in the reactor was discharged after t...

Embodiment 2

[0045] A kind of purification method of high-purity natural graphite, its purification step is:

[0046] Step 1, get the graphite 440kg that carbon content is 64%, put into reactor 1, add the EDTA of 34kg, the hydrofluoric acid of 60kg successively by the weight percentage of graphite (the concentration of hydrofluoric acid is 41%) , 2.4kg of nitric acid (the concentration of nitric acid is 98%) and the hydrochloric acid of 95kg (the concentration of hydrochloric acid is 30%), then add the water of 110L, stirring speed is 200 revs / min, stirring time 22 minutes;

[0047] Step 2, heat up reaction, open the temperature control device on the reactor I, make the temperature in the reactor I rise to 87°C, react at this temperature for 4 hours, stir once every 54 minutes during the reaction, and the stirring time for each time 5 minutes, the stirring speed was 200 rpm, after the reaction was completed, it was left to stand for 4 hours, and the tail gas in the reactor was discharged a...

Embodiment 3

[0060] A kind of purification method of high-purity natural graphite, its purification step is:

[0061] Step 1, get the graphite 480kg that carbon content is 68%, put into reactor 1, add the EDTA of 38kg, the hydrofluoric acid of 70kg successively by the weight percentage of graphite (the concentration of hydrofluoric acid is 42%) , 2.8kg of nitric acid (the concentration of nitric acid is 98%) and the hydrochloric acid of 80kg (the concentration of hydrochloric acid is 31%), then add 120L water, start stirring, rotating speed 200 revs / min, stirring time 24 minutes;

[0062] Step 2, heat up reaction, open the temperature control device on the reactor I, make the temperature in the reactor I rise to 89 ° C, react at this temperature for 5 hours, stir once every 58 minutes during the reaction, and the stirring time for each time 7 minutes, the stirring speed was 200 rpm, after the reaction was completed, it was left to stand for 5 hours, and the tail gas in the reactor was disc...

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Abstract

The invention discloses a purification method for high-purity natural graphite. A method for purifying graphite at high temperature is adopted, and the high-purity graphite is prepared by high temperature reaction, chemical purification, washing and dehydration. An oxidizer and a complexing agent are reacted with the natural graphite, impurities in the raw material are removed, and the graphite with low content of trace element and stable properties is obtained. In the process, the graphite raw material with the carbon content of more than 60 percent is purified, and the graphite with the purity of over 99.9991 percent, ash content of less than 1PPM and the trace elements of less than 0.5PPM is obtained; and the method has the advantages that: the process is simple, and is easy to operate; the production efficiency is high; the power consumption is low; large processing equipment is not needed; and the production cost is saved.

Description

technical field [0001] The invention relates to a method for purifying graphite, in particular to a method for purifying high-purity natural graphite. Background technique [0002] Graphite has the function of lubrication, and has good high temperature resistance, excellent electrical conductivity, thermal conductivity and other characteristics, and has a wide range of applications. In the electrical industry, it is used to produce carbon electrodes, electrode carbon rods, batteries, etc.; in the mechanical field, it is often used as a lubricant for high-speed machinery; in the chemical industry, it is used to manufacture various anti-corrosion vessels and equipment; natural graphite particles The shape, crystal structure, surface structure, and impurity content of graphite are closely related to the lithium intercalation performance of graphite materials. Common natural graphite shapes are mainly dense crystalline graphite, flake graphite, and aphanitic graphite. Pure natu...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 侯玉奇
Owner LUOYANG GUANQI INDAL & TRADE
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