Graphitization process of graphite electrode:Graphitization of graphite electrodes refers to a high-temperature heat treatment process in which carbon products
Graphitization process of graphite electrode:
Graphitization of graphite electrodes refers to a high-temperature heat treatment process in which carbon products are heated to above 2300 ℃ in a protective medium in a high-temperature electric furnace to transform the amorphous chaotic layer structure carbon into a three-dimensional ordered graphite crystalline structure.
The purpose and function of graphitization:
①Improve the conductivity and thermal conductivity of graphite electrode(resistivity is reduced by 4-5 times, and thermal conductivity is increased by about 10 times);
②Improve the thermal vibration resistance and chemical stability of the graphite electrode (the linear expansion coefficient is reduced by 50-80%);
③Make the graphite electrode have lubricity and anti-wear properties;
④ Discharge impurities and improve the purity of graphite electrodes (the ash content of the product is reduced from 0.5-0.8% to about 0.3%).
Realization of graphitization process:
Graphitization of graphite electrode is carried out at a high temperature of 2300-3000 ℃, so the industry can only be realized by electric heating。
Currently widely used furnace types include 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, uniform resistivity, but it is not easy to install joints.
The graphitization process of graphite electrode is controlled by measuring the temperature to determine the electric power curve suitable for the heating situation. The power-on time is 50-80 hours for the Acheson furnace and 9-15 hours for the LWG furnace.
Graphitization consumes a lot of electricity, generally 3200-4800KWh, and the process cost accounts for about 20-35% of the entire production cost.
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