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Graphite purifying method by adding fluoride salt as impregnant

A technology of graphite purification and impregnation, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of environmental damage, cumbersome process and high cost, and achieve the effect of avoiding environmental damage, simplifying the process and improving the effect.

Inactive Publication Date: 2018-09-14
SINOSTEEL NEW MATERIAL ZHEJIANG
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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 address the deficiencies of the prior art, to provide a graphite purification method that adds fluoride salt as an impregnating agent, by adding fluoride salt in the impregnating agent, and entering the product with the impregnating agent through the impregnating pressure, During the graphitization heating process of the graphite product, the fluoride salt mixed in the graphite is automatically decomposed to generate fluorine gas to purify the graphite product, which solves the environmental damage caused by the use of freon for purification in the prior art and the need for multi-step gas access, cumbersome process and high cost

Method used

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  • Graphite purifying method by adding fluoride salt as impregnant
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  • Graphite purifying method by adding fluoride salt as impregnant

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A graphite purification method adding fluoride salt as an impregnating agent comprises the following production steps:

[0053] 1. Selection of raw materials, petroleum coke and pitch; mainly the following raw materials and performance indicators: petroleum coke: fixed carbon content ≥ 98.5%, ash content ≤ 0.5%, boron (B), gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) are all less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.5%;

[0054] Asphalt: ash content ≤0.5%, volatile content 35-60%, coking value 40-70%, softening point 80-200℃, quinoline insoluble matter 8-25%, toluene insoluble matter 25-55% ;

[0055] The ash content in the binder is ≤0.5%, the volatile content is 35-60%, the coking value is 40-70%, the softening point is 80-200°C, the quinoline insoluble matter is 8-25%, and the toluene insoluble matter is 25- 55%;

[0056] 2. Raw material grinding, petroleum coke grinding and crushing, so that the average parti...

Embodiment 2

[0065] A graphite purification method adding fluoride salt as an impregnating agent comprises the following production steps:

[0066] 1. Selection of raw materials, petroleum coke and pitch; mainly the following raw materials and performance indicators: petroleum coke: fixed carbon content ≥ 98.5%, ash content ≤ 0.5%, boron (B), gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) are all less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.5%;

[0067] Asphalt: ash content ≤0.5%, volatile content 35-60%, coking value 40-70%, softening point 80-200℃, quinoline insoluble matter 8-25%, toluene insoluble matter 25-55% ;

[0068] The ash content in the binder is ≤0.5%, the volatile content is 35-60%, the coking value is 40-70%, the softening point is 80-200°C, the quinoline insoluble matter is 8-25%, and the toluene insoluble matter is 25- 55%;

[0069] 2. Raw material grinding, petroleum coke grinding and crushing, so that the average parti...

Embodiment 3

[0078] A graphite purification method adding fluoride salt as an impregnating agent comprises the following production steps:

[0079] 1. Selection of raw materials, petroleum coke and pitch; mainly the following raw materials and performance indicators: petroleum coke: fixed carbon content ≥ 98.5%, ash content ≤ 0.5%, boron (B), gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) are all less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.5%;

[0080] Asphalt: ash content ≤0.5%, volatile content 35-60%, coking value 40-70%, softening point 80-200℃, quinoline insoluble matter 8-25%, toluene insoluble matter 25-55% ;

[0081] The ash content in the binder is ≤0.5%, the volatile content is 35-60%, the coking value is 40-70%, the softening point is 80-200°C, the quinoline insoluble matter is 8-25%, and the toluene insoluble matter is 25- 55%;

[0082] 2. Raw material grinding, petroleum coke grinding and crushing, so that the average parti...

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Abstract

The invention relates to a graphite purifying method by adding fluoride salt as an impregnant. The graphite purifying method comprises the following steps: adding the fluoride salt into a graphite impregnant, and uniformly mixing, thus obtaining a mixed impregnant, wherein the average grain diameter of the fluoride salt is 1 to 2 mu m, and a mass ratio of the impregnant to the fluoride salt is 1:(0.1 to 0.3); impregnating a graphite product after primary roasting by using the mixed impregnant, wherein the impregnating pressure is 3 to 8 MPa, and the impregnating temperature is 250 to 450 DEG C; and carrying out secondary roasting, putting the graphite product in a graphitizing furnace, introducing nitrogen when the furnace core temperature is up to 1800 to 1900 DEG C, stopping introducingthe nitrogen until continuously rising the temperature to 1900 to 2000 DEG C, and introducing chlorine into the graphitizing furnace; decomposing the fluoride salt when the furnace core temperature excesses 1700 DEG C, and generating fluorine. According to the graphite purifying method disclosed by the invention, the problems in the prior art that the environment is damaged as freon is used for purifying, multi-step gas introduction requires to be carried out, the technology is tedious, and the cost is high are solved.

Description

Technical field: [0001] The invention relates to the technical field of graphite preparation, in particular to a graphite purification method in which fluoride salt is added as an impregnating agent. Background technique: [0002] After the graphite product is roasted, some internal impurities need to be removed. The current purified graphite is purified by gas heat in graphitization. The melting point and boiling point of most metal halides are relatively low, especially some high boiling point impurities such as Boron, vanadium, molybdenum, silicon, etc. must be removed by chlorination and fluorination. During graphitization / purification, nitrogen is generally introduced when the temperature of the furnace core reaches a certain level, the air in the furnace core is removed, and then chlorine gas is introduced. After the high boiling point impurities are formed into compounds, the boiling point is lowered and discharged with the gas. [0003] The freon used in the existi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 黄岱杨辉徐建平肖绍懿费勇
Owner SINOSTEEL NEW MATERIAL ZHEJIANG