Manufacturing process of carbon electrode for furnace

‌The manufacturing process of carbon electrodes for furnaces mainly includes the following steps: batching, molding, roasting and machining.
‌Batching‌: The main raw materials of carbon electrodes for furnaces include electric calcined anthracite, petroleum coke, graphite fragments and coal tar. These raw materials need to be mixed in a certain proportion‌.
‌Molding‌: After the mixed raw materials are stirred evenly at an appropriate temperature, the initial shape of the electrode is made by a pressing molding process. This step usually requires the addition of binder asphalt and tar to ensure the stability and conductivity of the electrode‌.
‌Roasting‌: The formed electrode needs to be slowly roasted in a roasting furnace to remove residual volatiles and impurities and enhance the physical and chemical properties of the electrode‌.
‌Machining‌: Finally, the roasted electrode is trimmed and finished by machining to ensure that it meets the requirements for use‌.
Differences in the manufacturing process of different types of carbon electrodes
‌Carbon electrode‌: Made of low-ash anthracite, metallurgical coke, asphalt coke and petroleum coke as raw materials, with the addition of binder asphalt and tar, and slowly baked in a baking furnace‌.
‌Graphite electrode‌: Made of petroleum coke and asphalt coke as raw materials, carbon electrodes are then placed in a graphitization resistance furnace at a temperature of 2000~2500℃ and graphitized to obtain the electrode‌.
‌Self-baking electrode‌: Made of anthracite, coke, asphalt and tar as raw materials, electrode paste is made and then loaded into the electrode shell. During the production process of the electric furnace, it relies on the Joule heat generated by the current and the heat transfer in the furnace to self-sinter and coke‌.
Application field
Furnace carbon electrodes are widely used in the smelting process of metals or non-metals such as industrial silicon, ferroalloys, calcium carbide, and yellow phosphorus. They are energy-saving and environmentally friendly, and can significantly reduce smelting power consumption and reduce pollution‌.