Graphitization of graphite electrode production process

By:Yvonne Aug 06, 2020
Graphitization process of graphite electrodes
Graphitization is a high-temperature heat treatment process in which carbon products are heated to above 2300 ℃ in the protective medium in a high temperature electric furnace to transform amorphous disordered structure carbon into three-dimensional ordered stone inky structure.
Graphitization process:
Graphitization of graphite electrode is carried out at a high temperature of 2300-3000 ℃. Therefore, in industry, it can only be realized by means of electric heating, that is, the current passes through the heated roasted products directly. The roasted products in the furnace are not only the conductor of high temperature generated by the current, but also the objects heated to high temperature.
• At present, widely used furnace types are Acheson graphitization furnace and internal heat series (LWG) furnace. The former has large output, large temperature difference and high power consumption, while the latter has short heating time, low power consumption and uniform resistivity, but it is difficult to install the joint.
• The graphitization process is controlled by determining the electrical power curve corresponding to the temperature rise through temperature measurement. The electrification time is 50-80 hours for Acheson furnace and 9-15 hours for LWG furnace.
• Graphitization consumes a lot of power, generally 3200-4800kwh, and the process cost accounts for about 20-35% of the total production cost
• Inspection of graphitized products: appearance percussion, resistivity test
Purpose and function of graphitization:
• Improve the electrical conductivity and thermal conductivity of carbon materials (the resistivity decreases 4-5 times, the thermal conductivity increases about 10 times);
• Improve thermal shock resistance and chemical stability of carbon materials (linear expansion coefficient reduced by 50-80%);
•Make the carbon material lubricity and wear resistance;
•discharge impurities, improve the purity of carbon materials (the ash content of products from 0.5-0.8% to 0.3% or so).
  • China graphite electrode, needle coke mar

    China graphite electrode, needle coke mar

    In April 2021, China exported 32,900 tons of graphite electrode, 17,100 tons of oil-based needle coke and 12,200 tons of coal-based needle coke. ... ...Read More>>

    2021-05-25
  • ISO9001 manufacturing and procesing of gr

    ISO9001 manufacturing and procesing of gr

    ISO 9001 is a global quality management system standard, which is the guarantee of the quality of graphite electrodes. Dancarbon graphite electrode products through the ISO9001 quality certification.... ...Read More>>

    2021-05-24
  • Graphite Electrodes for Steel making, Iro

    Graphite Electrodes for Steel making, Iro

    Graphite electrode steelmaking uses alternating current or direct current as the power source, and uses the high temperature of the arc generated between the furnace charge and the graphite electrode to heat the furnace charge.... ...Read More>>

    2021-05-13
  • Eaf graphite electrodes

    Eaf graphite electrodes

    EAF steel-making has high production efficiency, saves energy and reduces environmental pollution, compared with traditional steel-making.... ...Read More>>

    2021-04-20
  • Graphite electrodes china 2021

    Graphite electrodes china 2021

    According to customs data, from January to December in 2020, China exported 306,000 tons of graphite electrodes, 13.8% less than the same period last year. The total amount of graphite electrode export was USD742.977 million, which was USD140718.3 million less than last year.... ...Read More>>

    2021-03-04
  • HD graphite electrodes

    HD graphite electrodes

    HD graphite electrodes means High Density graphite electrodes, Its power is between RP and HP, and its physical and chemical indexes are also between them.... ...Read More>>

    2021-02-24