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Graphite purification method with adding fluoride salt in formula

A technology of graphite purification and fluoride salt, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems of cumbersome process, high cost, environmental damage, etc., to simplify the process, avoid environmental damage, and improve purification. effect of effect

Inactive Publication Date: 2018-09-18
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 salts to the formula, by adding fluoride salts to the graphite product ingredients, so that the graphite products are in the graphitization heating process, The fluoride salt mixed in the graphite can be automatically decomposed to produce 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 introduction, cumbersome process and high cost.

Method used

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  • Graphite purification method with adding fluoride salt in formula
  • Graphite purification method with adding fluoride salt in formula
  • Graphite purification method with adding fluoride salt in formula

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Effect test

Embodiment 1

[0052] A kind of graphite purification method that adds fluoride salt to formula, comprises following production steps:

[0053] 1. Selection of raw materials, petroleum coke and binder, wherein the average particle size of petroleum coke is 50 μm; calcium fluoride is added to the binder, the average particle size of calcium fluoride is 1-5 μm, and the average particle diameter is ≤0.1- 0.3 times the average particle size of petroleum coke particles in the graphite formula, the mass ratio of calcium fluoride and binder is 0.1:1. At this ratio, at about 280 ° C, the measured viscosity of the mixture of calcium fluoride and binder is 23.50cP;

[0054] 2. Ingredients and kneading, kneading 65-80 parts by weight of coke and 35-20 parts by weight of binder, the temperature is 300 ° C, and the kneading time is 120 minutes;

[0055] 3. Molding, molding the product obtained in step 3, the molding pressure is 100-250MPa, the holding time is 20min, the length of the green body is 2000m...

Embodiment 2

[0065] A kind of graphite purification method that adds fluoride salt to formula, comprises following production steps:

[0066] 1. Selection of raw materials, petroleum coke and binder, wherein the average particle size of petroleum coke is 50 μm; sodium fluoride is added to the binder, the average particle size of sodium fluoride is 1-5 μm, and the average particle diameter is ≤0.1- 0.3 times the average particle size of petroleum coke particles in the graphite formula, the mass ratio of sodium fluoride and binder is 0.1:1. At this ratio, at about 280 ° C, the measured viscosity of the mixture of sodium fluoride and binder is 19.52cP;

[0067] 2. Ingredients and kneading, kneading 65-80 parts by weight of coke and 35-20 parts by weight of binder, the temperature is 300 ° C, and the kneading time is 120 minutes;

[0068] 3. Molding, molding the product obtained in step 3, the molding pressure is 100-250MPa, the holding time is 20min, the length of the green body is 2000mm, t...

Embodiment 3

[0078] A kind of graphite purification method that adds fluoride salt to formula, comprises following production steps:

[0079] 1. Selection of raw materials, petroleum coke and binder, wherein the average particle size of petroleum coke is 50 μm; potassium fluoride is added to the binder, the average particle size of potassium fluoride is 1-5 μm, and the average particle diameter is ≤0.1- 0.3 times the average particle size of petroleum coke particles in the graphite formula, the mass ratio of potassium fluoride and binder is 0.1:1, at this ratio, at about 280 ° C, the measured viscosity of the mixture of potassium fluoride and binder is 21.45cP;

[0080] 2. Ingredients and kneading, kneading 65-80 parts by weight of coke and 35-20 parts by weight of binder, the temperature is 300 ° C, and the kneading time is 120 minutes;

[0081] 3. Molding, molding the product obtained in step 3, the molding pressure is 100-250MPa, the holding time is 20min, the length of the green body ...

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Abstract

The invention relates to a graphite purification method with adding fluoride salt in a formula. The graphite purification method comprises the following production steps of selecting cokes and an adhesive as raw materials, adding the fluoride salt with a certain ratio in the adhesive, milling and crushing the raw materials to enable the average particle size not to exceed 50 microns, performing mixing kneading on the 65-80 parts of the cokes and 35-20 parts of adhesive, performing formation on an obtained product, performing roasting after formation, and dipping a graphite product after beingroasted with an impregnant; introducing nitrogen for exhausting air when a temperature of a furnace body is raised to 1800-1900 DEG C, and stopping introduction of the nitrogen and changing to introduce chlorine when the temperature is 1900-2000 DEG C; and when the temperature reaches 2200 DEG C, enabling the fluoride salt to start to decompose to produce fluorine gas. The graphite purification method provided by the invention solves the problems that Freon is used to perform purification to cause environmental destruction, multi-step gas introduction needs to be performed, the technology is tedious, and the cost is high in the prior art.

Description

Technical field: [0001] The invention relates to the technical field of graphite purification, in particular to a graphite purification method in which fluoride salt is added to a formula. Background technique: [0002] After the graphite product is roasted, some impurity elements inside 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 existing tec...

Claims

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Application Information

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IPC IPC(8): C01B32/215
CPCC01B32/215
Inventor 黄岱杨辉沈华平许汉春
Owner SINOSTEEL NEW MATERIAL ZHEJIANG
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