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A kind of preparation method of graphite material for oxygen, nitrogen and hydrogen analysis instrument

A technology for analysis instruments and graphite materials, which is applied in the field of preparation of graphite materials for oxygen, nitrogen and hydrogen analysis instruments, can solve problems such as difficult to meet, and achieve the effects of preventing product adhesion, increasing density and strength, and preventing product cracking

Active Publication Date: 2021-09-28
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Usually, the raw material aggregate for the production of massive high-purity graphite products is calcined petroleum coke or calcined pitch coke, the nitrogen content of the raw material is generally 0.2% to 1.5%, and the nitrogen content of the product after graphitization is generally 0.004% to 0.05%. It is difficult to meet the requirement that the nitrogen content of the graphite crucible used for oxygen, nitrogen and hydrogen analysis instruments is less than 1ppm

Method used

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  • A kind of preparation method of graphite material for oxygen, nitrogen and hydrogen analysis instrument
  • A kind of preparation method of graphite material for oxygen, nitrogen and hydrogen analysis instrument
  • A kind of preparation method of graphite material for oxygen, nitrogen and hydrogen analysis instrument

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Embodiment 1

[0024] In the present embodiment, the main performance indicators of aggregate microcrystal graphite and binder coal aspage are as follows: microcrystalline graphite: a gray is 0.32%; nitrogen content is 0.013%; graphite is 93.3%; coal asphalt: softening point 85 ° C; The toluene is not soluble 22.4%; the quinoline is not soluble 7.1%; figure 1 The production process of this embodiment is carried out in the following steps:

[0025] Step 1: The dried microcrystalline graphite was pulverized through 0.15 m sieve, with a greater than 0.075 mm component to 31%, as aggregate spare; the coal asphalt was heated to 160 ° C.

[0026] Step 2: According to 76% of microcrystalline graphite, the weight of the coal asphalt is weighed;

[0027] Step 3: Always referring to a fine microcrystalline graphite in the mixed apparatus, then add a sufficiently molten coal seam, mixed 40 min at 160 ° C to give a paste;

[0028] Step 4: Place the paste in the extruded molding machine, extruded under a 30 ...

Embodiment 2

[0061] In the present embodiment, the main performance indicators of aggregate microcrystal graphite and binder coal asphalt: microcrystalline graphite: 0.32% ash; nitrogen content 0.013%; graphite level 93.3%; warm coal asphalt: Softening point 85 ° C The toluene is less than 22.4%; the quinoline is not soluble 7.1%; for specific process flows figure 1 The production process of this embodiment is carried out in the following steps:

[0062] Step 1: The dried microcrystalline graphite was pulverized through 0.15 m sieve, wherein greater than 0.075 mm component proportional to 39%, as aggregate spare, heat the coal asphalt to 165 ° C fully melted;

[0063] Step 2: According to 78% microcrystalline graphite, 22% of the coal asphalt is weighed;

[0064] Step 3: The microcrystalline graphite that is known under normal pressure is put into the mixed apparatus, then the sufficiently molten coal seam is added, mixed at 165 ° C for 30 min to give a paste;

[0065] Step 4: Place the paste ...

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Abstract

The invention discloses a preparation method of a graphite material for an oxygen, nitrogen and hydrogen analysis instrument, comprising the following steps: 1) preparing a paste; 2) extruding into a green bar; 3) carbonizing to prepare a carbonized bar; 4) purifying Obtain high-purity graphite materials for oxygen, nitrogen and hydrogen analysis instruments. In the present invention, low-nitrogen natural microcrystalline graphite is used as the main raw material, which significantly reduces the nitrogen content of the raw material compared with the current production technology that generally uses calcined petroleum coke and calcined pitch coke as raw materials, and is more conducive to production to meet the requirements of oxygen, nitrogen and hydrogen analysis. Graphite material for instruments. The natural microcrystalline graphite of the present invention has the advantages of high degree of graphitization and good lubricity, so the use of natural microcrystalline graphite as a raw material is beneficial to reduce the resistance between materials during molding, and obtain products with fine and compact structure and good uniformity; during the carbonization process, Using a specific heating system can effectively prevent the product from cracking, increase the carbon residue rate of the binder, and then increase the density and strength of the product.

Description

Technical field [0001] The present invention belongs to the field of graphite deep processing, and is specifically related to the preparation method of graphite material for oxyzign hydrogen analysis instruments. Background technique [0002] The detection of oxygen, nitrogen and hydrogen content in materials is increasingly attached. Most of the instrument for test oxyzine is a heat source in electrode pulse furnace. Under high purity helium, the solid sample is melted in a hot graphite crucible, and hydrogen is released in a hydrogen gas mononite; oxide and other state oxygen The carbon reduction from the graphite crucible is released in the form of carbon monoxide and carbon dioxide, and is completely converted into carbon dioxide through thermocyxoid oxide; various state nitrogen is released in gaseous monument; wherein the complete release of nitrogen often requires 280 ° C to 3000 ° C. High temperature. The gas to be tested is loaded into the detector, which is detected by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504C04B35/52C04B35/622
CPCC04B35/522C04B35/622G01N21/3504
Inventor 李建新黄启忠
Owner CENT SOUTH UNIV
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