The manufacturing process of furnace carbon electrodes mainly includes the following steps:
Raw material preparation: The main raw materials for making carbon electrodes include calcined anthracite, petroleum coke, graphite chips and coal pitch. These raw materials need to be strictly screened and mixed to ensure they have high crystallinity and appropriate particle size.
Batching and molding: Mix the selected raw materials according to a certain proportion, add binders such as asphalt and tar, and mix them thoroughly by stirring. The mixed materials are injected into the molding mold and vibrated and compacted to form an electrode body with a certain strength and shape.
Baking: The shaped electrode body needs to be put into the baking furnace for baking treatment. During the baking process, the electrode body will undergo a series of physical and chemical changes, further enhancing its electrical conductivity and mechanical strength.
Graphitization treatment: The fired electrode needs to be graphitized. This step is usually performed at high temperatures to optimize the internal structure of the electrode and significantly improve the conductive performance. Graphitization treatment not only improves the electrical conductivity of the electrode, but also improves its high temperature resistance.
Application areas and advantages of carbon electrodes:
Carbon electrodes are widely used in submerged arc furnaces, especially in the smelting process of industrial silicon, ferroalloys, calcium carbide, yellow phosphorus and other metals or non-metals. Its advantages include:
Cost-Effectiveness: Since graphitization is not required, the production cost of carbon electrodes is lower, and the high energy consumption in the graphitization process also significantly reduces the overall cost.
Conductivity: Carbon electrodes have low resistivity, which can reduce power loss and improve smelting efficiency.
Large diameter production: Carbon electrodes can produce products with larger diameters (such as Φ780-Φ1400mm), which are suitable for the use of large submersible furnaces.
Environmental protection advantages: Compared with electrode paste, carbon electrodes do not produce harmful smoke during use and have less impact on the environment