For electric arc steelmaking furnace
Graphite electrodes are mainly used for electric furnace steelmaking.
Electric furnace steelmaking uses graphite electrodes to introduce current into the furnace. A strong current generates arc discharge through gas at the lower end of the electrode and uses the heat generated by the arc to smelt.
According to the capacity of the electric furnace, graphite electrodes of different diameters are equipped. In order to make the electrodes continuous use, the electrodes are connected by the electrode screw joints.
Graphite electrodes for steelmaking account for about 70-80% of the total amount of graphite electrodes.
Used for submerged electric furnace
Graphite electrode ore thermoelectric furnace is mainly used to produce ferroalloys, pure silicon, yellow phosphorus, matte and calcium carbide, etc. Its characteristic is that the lower part of the conductive electrode is buried in the charge, so in addition to the heat generated by the arc between the electric plate and the charge, current When passing through the charge, the resistance of the charge also generates heat.
Every ton of silicon consumes about 150kg of graphite electrode, and every ton of yellow phosphorus consumes about 40kg of graphite electrode.
For resistance furnace
Graphitization furnaces for the production of graphite products, melting furnaces for melting glass, and electric furnaces for the production of silicon carbide are all resistance furnaces. The materials in the furnace are both heating resistors and heated objects.
Usually, the graphite electrode for conducting is inserted into the furnace head wall at the end of the hearth, so the conducting electrode is not consumed continuously.
A large number of graphite electrode blanks are also used for processing into various crucibles, graphite boats, hot die casting molds and vacuum electric furnace heating elements and other special-shaped products.
For example, in the quartz glass industry, 10 tons of graphite electrode blanks are required for every production of lt electric fusion tubes, and 100kg of electrode blanks are consumed for every production of lt quartz bricks.
It should also be noted that there are three types of graphite composite materials at high temperatures, including graphite electrodes, graphite molds and graphite crucibles. In these three materials, graphite is prone to oxidation and combustion reactions at high temperatures, causing surface glue The increased porosity and loose structure of the carbon layer affect the service life.