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Ultrahigh-power graphite electrode and preparation method thereof

A graphite electrode and power technology, which is applied in the field of ultra-high-power graphite electrodes and their preparation, can solve the problems of low flexural strength of ultra-high-power graphite electrodes, insufficient physical and chemical indicators, and low hardness of graphite electrodes, so as to improve the hardness, The effect of improving electrical conductivity and improving compactness

Inactive Publication Date: 2019-10-15
CHENGDU CHENGXIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the development of science and technology, the current large-capacity and ultra-high-power electric arc furnaces are developing rapidly, and the quality requirements for large-scale, ultra-high-power graphite electrodes are getting higher and higher. The consumption caused by electrode breakage accounts for more than 10% of the total consumption, which is mainly due to the low flexural strength of ultra-high power graphite electrodes and insufficient physical and chemical indicators. The existing graphite electrodes have low hardness, are easily damaged, and have low compactness , therefore, it is necessary to design an ultra-high power graphite electrode and its preparation method

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  • Ultrahigh-power graphite electrode and preparation method thereof

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Embodiment 1

[0023] An ultra-high power graphite electrode, including graphite powder, modified pitch, ferric oxide, carbon fiber and needle coke, the composition ratio of the above raw materials is: graphite powder 25%, modified pitch 25%, ferric oxide 2%, carbon fiber 3% and needle coke 45%.

[0024] A method for preparing an ultra-high-power graphite electrode, comprising the following steps: Step 1, grinding and preparing materials; Step 2, screening and preparing materials; Step 3, dry powder mixing; Step 4, wet mixing; Step 5, compression molding; Step 6 , roasting and impregnation; step seven, graphitization treatment; step eight, polishing and encapsulation;

[0025] Wherein in above-mentioned step 1, use ball mill, ferric oxide, carbon fiber and needle coke are ground respectively, after grinding, use sieve to carry out sieving, guarantee that ferric oxide, carbon fiber and needle coke particle diameter are 0.3~0.5mm, carbon fiber is a semi-finished product that has been carboniz...

Embodiment 2

[0034] An ultra-high power graphite electrode, including graphite powder, modified pitch, ferric oxide, carbon fiber and needle coke, the composition ratio of the above raw materials is: graphite powder 30%, modified pitch 25%, ferric oxide 2%, carbon fiber 3% and needle coke 40%.

[0035] A method for preparing an ultra-high-power graphite electrode, comprising the following steps: Step 1, grinding and preparing materials; Step 2, screening and preparing materials; Step 3, dry powder mixing; Step 4, wet mixing; Step 5, compression molding; Step 6 , roasting and impregnation; step seven, graphitization treatment; step eight, polishing and encapsulation;

[0036] Wherein in above-mentioned step 1, use ball mill, ferric oxide, carbon fiber and needle coke are ground respectively, after grinding, use sieve to carry out sieving, guarantee that ferric oxide, carbon fiber and needle coke particle diameter are 0.3~0.5mm, carbon fiber is a semi-finished product that has been carboniz...

Embodiment 3

[0045] An ultra-high power graphite electrode, including graphite powder, modified pitch, ferric oxide, carbon fiber and needle coke, the composition ratio of the above raw materials is: graphite powder 35%, modified pitch 25%, ferric oxide 2%, carbon fiber 3% and needle coke 35%.

[0046] A method for preparing an ultra-high-power graphite electrode, comprising the following steps: Step 1, grinding and preparing materials; Step 2, screening and preparing materials; Step 3, dry powder mixing; Step 4, wet mixing; Step 5, compression molding; Step 6 , roasting and impregnation; step seven, graphitization treatment; step eight, polishing and encapsulation;

[0047] Wherein in above-mentioned step 1, use ball mill, ferric oxide, carbon fiber and needle coke are ground respectively, after grinding, use sieve to carry out sieving, guarantee that ferric oxide, carbon fiber and needle coke particle diameter are 0.3~0.5mm, carbon fiber is a semi-finished product that has been carboniz...

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Abstract

The invention discloses an ultrahigh-power graphite electrode and a preparation method thereof. The ultrahigh-power graphite electrode comprises graphite powder, modified asphalt, iron trioxide, carbon fiber and needle coke. The preparation method of the graphite electrode comprises the following steps: grinding materials, sieving the materials, mixing with dry powder, performing wet mixing, performing compression molding, roasting and impregnating, performing graphitizing treatment as well as grinding and packaging. The content of the needle coke in the graphite electrode is increased, so that the electric conductivity of the graphite electrode is improved and the proportion of the graphite electrode is changed; along with increment of the needle coke quantity, the resistivity can be greatly reduced, the electric conductivity of the graphite electrode can be improved, loss of electric energy can be reduced and the conductive efficiency can be improved; through change of a mixing process, the uniformity of the mixed material can be improved, the intensity of the graphite electrode can be improved and the conductive efficiency of the graphite electrode can be improved; and through high-pressure impregnation, the compactness of the graphite electrode can be greatly improved, the hardness of the graphite electrode can be improved and the graphite electrode is not liable to damage.

Description

technical field [0001] The invention relates to the technical field of graphite electrodes, in particular to an ultra-high-power graphite electrode and a preparation method thereof. Background technique [0002] With the development of science and technology, the current large-capacity and ultra-high-power electric arc furnaces are developing rapidly, and the quality requirements for large-scale, ultra-high-power graphite electrodes are getting higher and higher. The consumption caused by electrode breakage accounts for more than 10% of the total consumption, which is mainly due to the low flexural strength of ultra-high power graphite electrodes and insufficient physical and chemical indicators. The existing graphite electrodes have low hardness, are easily damaged, and have low compactness , therefore, it is necessary to design an ultra-high power graphite electrode and its preparation method. Contents of the invention [0003] The object of the present invention is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532C04B35/80C04B35/622F27D11/10
CPCC04B35/522C04B35/532C04B35/622C04B35/806C04B2235/3272C04B2235/425C04B2235/5248C04B2235/5276F27D11/10
Inventor 周尚银苏正福乐先伟
Owner CHENGDU CHENGXIN TECH CO LTD
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