Graphite purification method

A graphite purification and graphite technology, applied in the field of ion exchange resin purification of natural graphite, can solve the problems of pollution, time-consuming, high energy consumption of the purification process, etc., and achieve the effects of simple operation process, low equipment investment cost, and short process processing time.

Inactive Publication Date: 2015-09-16
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problems of large energy consumption, long time consumption and serious pollution in the existing graphite purification process, and proposes a method to utilize A method for purifying graphite with ion exchange resins. This method uses cation exchange resins such as 732, D001, and D113, and anion exchange trees such as 210×4 and 210×7. Graphite can be automatically adsorbed on the surface of the ion exchange resin, so that the foreign ions in the graphite can be exchanged with H+ or OH- in the ion exchange resin, and the electric field is removed, and the graphite is automatically desorbed. High-purity graphite can be obtained after direct collection and drying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Use natural graphite with a carbon content of 85% to 95% as raw material, mix it with 30% to 38% sodium hydroxide solution at a mass ratio of 1:1, and rise from room temperature at a rate of 3 to 5min / s to 450-650°C, and keep at this temperature for 60-90 minutes; after the reaction, cool to room temperature, and wash the prepared sample with high-purity water until neutral; mix the sample with 8%-10% hydrochloric acid in a mass ratio of 1:3.84, Stir at ℃ for 4 hours; filter the solution after the reaction, and wash the sample with high-purity water to neutral, and AgNO 3 Detect the absence of Cl in the filtrate - ; put the above-mentioned graphite sample and high-purity water in a beaker and form a closed loop with the two poles of the DC power supply. Constant voltage, and act for 30 to 60 minutes, graphite is automatically adsorbed on the two poles under the action of an external electric field, in which the heteroions and the H of the ion exchange resin + or OH -...

Embodiment 2

[0014] The difference between this embodiment and embodiment 1 is: use natural graphite with a carbon content of 90% as raw material, mix it with 30% sodium hydroxide solution in a mass ratio of 1:1, and use 5min / s The rate was increased from room temperature to 450°C and maintained at this temperature for 60 minutes. This embodiment shortens the reaction time between sodium hydroxide and graphite and lowers the reaction temperature, which can reduce the degree of corrosion to equipment and still achieve corresponding technical effects. After purification by the above method, the fixed carbon content in graphite is 99.9%. The alkaline leaching of graphite to remove impurities plays an important role in the whole purification process, but usually requires higher temperature and longer reaction time. Since the application of ion exchange resin purification under the assistance of an external DC electric field has a better purification effect, the reaction time and temperature c...

Embodiment 3

[0016] The difference between this example and Example 1 is that the water treatment anion exchange resin described in Example 1 is one of 210×4 or 210×7 or D201 or D202.

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Abstract

The invention relates to a graphite purification process, in particular to a method for purification of natural graphite by ion exchange resin under the assistance of an external direct-current electric field. The preparation process includes: mixing graphite serving as the raw material with a sodium hydroxide solution evenly, raising the temperature from room temperature to 450-650DEG C, and maintaining the temperature for 60-90min; conducting cooling and washing to neutral; mixing the product with hydrochloric acid, performing stirring at 70DEG C for 4h; conducting washing to neutral; placing the graphite sample and high purity water at both poles of a direct current power supply to form a closed loop system, the direct current power supply positive pole and negative pole of which are respectively fixed with water treatment anion exchange resin and water treatment cation exchange resin that are coated with fine gauze or semi-transparent film; applying a constant voltage and letting the voltage act for 30-60min, and carrying out filtering and drying. The method provided by the invention has the advantages of simple technological operation, small energy consumption, short time, small pollution and low production cost, and is in accordance with industrial development requirements of fluorine-free production, and the purified graphite has fixed carbon content up to 99.9%-99.99%.

Description

technical field [0001] The invention relates to a method for purifying graphite, in particular to a method for purifying natural graphite by applying ion exchange resin under the assistance of an external direct current electric field. Background technique [0002] As an important non-metallic material, graphite has been widely used in metallurgy, chemical industry, oil refining, machinery, light industry, electronics, aerospace and nuclear industries. The carbon content of graphite required by these industries is as high as 99.9%, while the carbon content of natural graphite can only reach about 95%, which is far from meeting the high-purity requirements. Therefore, the graphite industry needs to develop in wider and deeper fields. The core problem of high purity of graphite raw materials must be solved. [0003] At present, the main purification methods of natural graphite are flotation method, high temperature method and chemical method, among which chemical method is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 刘翀周国江潘宇
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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