Graphite electrode: is mainly made of petroleum coke and needle coke, and coal asphalt is used as binder. It is made by calcining, batching, mixing, pressing, roasting, graphitization and machining. It is a kind of conductor which heats and melts the charge by releasing electric energy in electric arc furnace. According to its quality index, it can be divided into regular power graphite electrode(RP), high power graphite electrode(HP) and ultra high power graphite electrode(UHP).
(1) used for electric arc furnace Electric furnace steelmaking is a large use of graphite electrodes. The output of electric furnace steel in China is about 18% of that of crude steel, and graphite electrode for steelmaking accounts for 70% to 80% of the total amount of graphite electrode. Electric furnace steelmaking is to use graphite electrode to introduce current into the furnace, and use the high temperature heat source caused by electric arc between the electric extreme part and the furnace material to carry on the smelting.
(2) used for use in ore-heating furnaces. The electric furnace is mainly used to produce industrial silicon and yellow phosphorus, which is characterized by the lower part of the conductive electrode being buried in the charging material, forming an arc in the charging layer, and using the heat energy emitted by the resistance of the charging material itself to heat the charging material, in which graphite electrode is required for the mine heating furnace with high current density, for example, about 100 kg of graphite electrode is consumed for each production of 1 t silicon, and about 40 kg of graphite electrode for each production of 1t yellow phosphorus.
(3) used for resistance furnaces. Graphite furnaces for producing graphite products, furnaces for melting glass and electric furnaces for producing silicon carbide all belong to resistance furnaces, and the materials in the furnaces are both heat resistance and heating objects. Generally, graphite electrodes for conducting electricity are embedded in the furnace head wall at the end of the resistance furnace for discontinuous consumption of graphite electrodes here.
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