Graphite electrode with diameter of 348 mm and manufacture method thereof

A technology of graphite electrodes and graphite chips, applied in the field of graphite electrodes, can solve problems such as high strength and low porosity

Active Publication Date: 2014-11-05
焦作市中州炭素有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing graphite electrodes are far from meeting the requirements of high density, high strength, and low porosity. At the same time, this new type of graphite electrode can also be used as a high-end joint material, providing a new substitute for graphite electrode joints

Method used

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  • Graphite electrode with diameter of 348 mm and manufacture method thereof
  • Graphite electrode with diameter of 348 mm and manufacture method thereof
  • Graphite electrode with diameter of 348 mm and manufacture method thereof

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preparation example Construction

[0015] A kind of preparation method of diameter 348mm graphite electrode its preparation method is as follows:

[0016] (1) Calcination: Three kinds of high-quality petroleum cokes from Fushun, Tianjin and Jinzhou are mixed and crushed according to the ratio of 40~60%, 20~30%, 20~30%, and then calcined. The calcination temperature is 1250℃~1350℃. Density ≥ 2.08g / ㎝3, powder resistivity ≤ 500μΩm;

[0017] (2) Ingredients: Mix the petroleum coke calcined in step (1) and the domestic needle coke at a ratio of 70-80% and 20-30%, crush and sieve to obtain dry materials of different particle sizes, according to the following weight Percentage composition for batching: 18~25% of mixed petroleum coke with medium particle size of 2~0.5mm, 18~25% of mixed petroleum coke with small particle size below 0.5mm, 48~55% of powder with particle size of 0.074mm, and 5~12% of graphite powder with particle size below 2mm %; Finally, adding 10-25% of the total weight of dry material raw crushed; ...

Embodiment 1

[0029] The graphite electrode with a diameter of 348 mm in this embodiment is mainly composed of high-quality mixed petroleum coke as raw material of different particle sizes. 18% of petroleum coke, 55% of 0.074mm powder, and 9% of graphite fragments with a particle size of 2mm or less; add 24% of the binder in the dry material, and add 0.3% of stearic acid in the dry material; Add raw ground 10% by total weight of dry ingredients.

[0030] The preparation method of the 348mm diameter graphite electrode of the present embodiment is as follows:

[0031] (1) Calcination: Mix and crush three high-quality petroleum cokes from Fushun, Tianjin and Jinzhou in proportions of 40%, 30% and 30%, and then calcinate. Resistivity≤500μΩm;

[0032] (2) Ingredients: Mix the petroleum coke calcined in step (1) and domestic needle coke at a ratio of 70% and 30%, grind and sieve to obtain dry materials of different particle sizes, and mix according to the following weight percentage composition...

Embodiment 2

[0038] The graphite electrode with a diameter of 348 mm in this embodiment mainly consists of high-quality mixed petroleum cokes of different particle sizes as raw materials. The composition of the dry materials is: 25% of mixed petroleum coke with a medium particle size of 0.5 mm, and small particle sizes below 0.5 mm. 18% of mixed petroleum coke, 52% of 0.074mm powder, and 5% of graphite fragments with a particle size of less than 2mm; add 28% of the binder in the dry material, and add 0.5% of stearic acid in the dry material ; Add 25% of the total weight of the dry ingredients raw mince.

[0039] The preparation method of the 348mm diameter graphite electrode of the present embodiment is as follows:

[0040] (1) Calcination: Mix three kinds of high-quality petroleum cokes from Fushun, Tianjin and Jinzhou according to the proportion of 60%, 20% and 20%, and then calcine them. Resistivity≤500μΩm;

[0041] (2) Ingredients: Mix the petroleum coke calcined in step (1) and the ...

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Abstract

The invention discloses a graphite electrode with diameter of 348mm. The electrode mainly uses high quality hybrid petroleum coke as a raw material to prepare dry materials in different sizes; the dry materials are subjected to calcining, burdening, preparation of electrode green products, baking, graphitization and electrode preparation to obtain the finished products. The invention adopts the hybrid petroleum coke with middle and small particle sizes, wherein petroleum coke with small particle size less than 0.5 mm accounts for18-25%, so as to overcome the insufficiencies of low volume density and small flexural strength of the existing electrode, and prepare the electrode suitable for the need of graphite crucible and impermeable graphite material. A baking curve maintains at 400 to 800 DEG C for 165 h, and the key volatile period slows down to prevent product crack because that volatiles can be discharged in time under excessive heating; the method successfully solves the problems of easy cracking in roasting and graphitization heat treatment processes and low rate of finished product of multielectrode made of small granularity powder; and the first baking qualified rate of products and qualified rate of graphitization reach 98.5% and 99.2% respectively.

Description

technical field [0001] The invention relates to a graphite electrode, in particular to a graphite electrode with a diameter of 348 mm and a production method thereof. Background technique [0002] With the development of science and technology, products need to be constantly upgraded to meet market demand. The market demands more and more for existing graphite electrodes, especially graphite crucibles. The existing graphite electrodes are far from meeting the requirements of high density, high strength, and low porosity. At the same time, this new type of graphite electrode can also be used as a high-end joint material, providing a new substitute for graphite electrode joints. The formula of this patented product adopts medium and small particle size materials to theoretically solve the problem of high porosity and ensure the impermeability of the product. Contents of the invention [0003] The object of the present invention is to provide a graphite electrode with a di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 冯立明郑兴龙牛进才张跃丽王联合陈勇
Owner 焦作市中州炭素有限责任公司
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