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High pure graphitic profile and preparation technique thereof

A high-purity graphite and production process technology, applied in the field of graphite material production, can solve the problems of insufficient purity and low density of large-scale products, and achieve the effects of small friction coefficient, high density and good thermal shock resistance

Active Publication Date: 2009-02-04
洛阳宜墨新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for producing high-purity and high-density graphite profiles, and discloses fan-shaped columnar high-purity graphite profiles produced by this process, which are convenient for users to splice into large-scale cylindrical shapes. Graphite meets market demand and solves technical problems such as insufficient purity and low density of existing large-scale products

Method used

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  • High pure graphitic profile and preparation technique thereof
  • High pure graphitic profile and preparation technique thereof
  • High pure graphitic profile and preparation technique thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1 see figure 1 , a production process of high-purity graphite profiles, comprising the following steps:

[0040] (1) Grinding Select calcined petroleum coke (true specific gravity ≥ 2.08g / cm 3 , ash, sulfur, and volatile matter are all ≤0.3%) crushed and milled, with a particle size of 300 mesh;

[0041] (2) Kneading is based on parts by weight. Take 70 parts of the above-mentioned sieved powder and dry mix it in a kneading pot for 50 minutes to reach 130°C; then add 30 parts of molten coal tar pitch (softening point 88 ±2°C), then wet mix in the pot for 70 minutes to reach 155°C;

[0042] (3) Sheet rolling After kneading, the thickness of the sheet rolling for the first time is 2mm, and the thickness of the sheet rolling for the second time is 1.5mm;

[0043] (4) Secondary milling: Carry out secondary milling to 200 orders after the rolled flakes obtained in the previous step are pulverized;

[0044] (5) Compression molding: mold the powder obtained in the ...

Embodiment 2

[0050] Example 2 see figure 1 , the production process steps of a high-purity graphite profile are as follows:

[0051] ① Grinding Select pitch coke for crushing and grinding, and its particle size is 250 mesh;

[0052] ② Kneading Take 75 parts of pitch coke powder after sieving, put it in a kneading pot and dry mix it for 45 minutes to reach 125°C; then add 25 parts of melted coal tar pitch at a temperature of 160°C, and then wet mix it in the pot for 65 minutes, reach 155°C;

[0053] ③Rolled sheet After kneading, the thickness of the first rolled sheet is 3mm, and the thickness of the second rolled sheet is 1.2mm;

[0054] ④Secondary milling The rolled sheet is milled again to 200 mesh;

[0055] ⑤ Compression molding: Mold the secondary powder into a specific fan-shaped column;

[0056] ⑥Roasting Put the formed carbon block in a fixed pot, send it into a roasting furnace, slowly raise the temperature from room temperature to 1200°C, and roast for 400 hours;

[0057] ⑦Im...

Embodiment 3

[0062] Embodiment 3 A kind of production technology of high-purity graphite section bar is basically the same as embodiment 1, and difference is: in step (1) with the mixed raw material pulverization of calcined petroleum coke and pitch coke; In step (2) ) used binder is phenolic resin; In step (5), carbon powder is packed into fan-shaped mold, molded into a fan-shaped column with a central angle of section of 72 °; In step (8), one impregnation and two corresponding Roasting; in step (9), the fan-shaped columnar graphite after the roasting is placed in a closed graphite purification electric furnace, and the bottom of the furnace is lined with carbon black, the inner wall of the furnace is lined with pitch coke powder, and the carbon products are filled with calcined coke particles The gap between them; the inner chamber of the purification furnace is purged with nitrogen, and the temperature is raised to 2200°C within 52 hours, and the chlorine gas is passed through at a flow...

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Abstract

The invention relates to a production process of a high-purity graphite section and a sectorial columnar graphite section prepared by the process. The process comprises the following steps: milling, mixing kneading, rolling, re-milling, compression molding, roasting, dipping, re-roasting and dipping to the selected materials; placing the roasted carbon products in a closed graphite purification furnace; sequentially inletting inert gas, chlorine, Freon and tetrafluoroethane inert gas under corresponding temperature for graphitization purification. The process has the advantages of short roasting and graphitization time, high production efficiency and low energy consumption. The graphite section prepared by the process is characterized by high purity, high density, high intensity, good thermal shock resistance, easy precision finishing and extremely wide application. Moreover, the prepared sectorial columnar graphite section, which is easy to be spliced into cylindrical graphite, can avoid the generation of cracks owing to excessive temperature differentials between the exterior and the core of large-scaled sections, prolongs the service life of the products and meets the needs of the market on large-size and high-standard cylindrical graphite section.

Description

technical field [0001] The invention relates to the field of graphite material production, in particular to a high-purity, high-density, high-strength graphite profile production process and fan-shaped columnar graphite profiles prepared by the process. technical background [0002] Graphite has high temperature resistance, good electrical and thermal conductivity, and stable chemical properties, so it is widely used in industry, and it is used in almost every industry. Artificial graphite is mostly used in industry, that is, special graphite, which can be divided into isostatic graphite, molded graphite, and extruded graphite according to its molding method. [0003] Patent literature CN 1247451C discloses a production process for high-density, high-strength and wear-resistant graphite materials, and CN 100344533C discloses a preparation method for high-strength carbon / graphite materials, but the graphite materials prepared by these processes Still can not satisfy current ...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 张全利赵稳成韩新威王双全吴保军
Owner 洛阳宜墨新材料有限公司
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