Speaking of the use of graphite electrodes for sale, they are mainly used in electric furnace steelmaking. The graphite electrode for electric arc furnace smelting is an electric furnace steelmaking, and the graphite electrode is used to introduce current into the furnace. A strong current generates an arc discharge through the gas at the lower end of the electrode, and uses the heat generated by the arc to smelt.
(1) Graphite electrode is used in electric arc steel making furnace
According to the capacity of the electric furnace, graphite electrodes with different diameters need to be equipped. In order to use the electrodes continuously, the electrodes are connected by electrode screw joints. Graphite electrodes for electric arc furnace smelting account for about 70 to 80% of the total amount of graphite electrodes.
The heat during smelting is generated by the arc discharge between the electrode and the metal charge. The arc formed at its tip converts electrical energy into thermal energy for smelting needs. Since most of it is in the furnace, it bears the radiant heat of high temperature furnace gas, molten pool surface, furnace wall and arc column of electrode tip. Furnace gas scours the electrode surface and heats the electrode by convection heat supply. This heat transfer effect is strengthened with the increase of furnace gas and material temperature and the increase of furnace gas volume.
It is precisely because of the graphite electrode that it is in such a harsh working environment. Compared with other conductive materials, graphite materials have some excellent or irreplaceable characteristics under high temperature conditions. Therefore, graphite electrodes can be divided into ordinary power graphite electrodes, high power graphite electrodes, and ultra high power graphite electrodes. Graphite electrodes can be used at relatively high temperatures. The sublimation temperature is 3650 ℃, which is a high-temperature conductive material that can withstand high temperatures. In actual graphite electrode uses, there is no other material to replace. At high temperature, the strength of graphite increases with increasing temperature. Compared with other metals, graphite has the lowest coefficient of thermal expansion.
(2) Used in ore heating furnace
Graphite electrode ore thermoelectric furnace is mainly used to produce iron alloy, pure silicon, yellow phosphorus, matte and calcium carbide. Its characteristic is that the lower part of the conductive electrode is buried in the charge. Therefore, in addition to the heat generated by the arc between the electric plate and the charge, heat is also generated by the resistance of the charge when the current passes through the charge. It takes about 150kg of graphite electrode per ton of silicon, and about 40kg of graphite electrode per ton of yellow phosphorus.
(3) For resistance furnace
Graphitization furnaces for producing graphite products, melting furnaces for melting glass, and electric furnaces for producing silicon carbide are all resistance furnaces. The materials contained in the furnace are both heating resistors and heated objects. Generally, graphite electrodes for electrical conduction are inserted into the furnace head wall at the end of the hearth. Therefore, the conductive electrode is not continuously consumed.
