Graphite electrode
Graphite electrode, also known as artificial graphite electrode, is based on petroleum coke and needle coke as the main raw materials, coal tar pitch as the binder, after calcination, pulverization and grinding, mixing of ingredients, extrusion forming, roasting, pitch impregnation, graphitization, A high temperature resistant graphite conductive material produced by a series of processes such as mechanical processing has the characteristics of high temperature resistance, high conductivity, oxidation resistance, high mechanical strength, and low impurity content.
Uses of graphite electrodes
(1) For electric arc steelmaking furnace
Electric furnace steelmaking is a big user of graphite electrodes. The output of electric furnace steel in my country accounts for about 18% of the output of crude steel, and graphite electrodes for steelmaking account for 70% to 80% of the total consumption of graphite electrodes. Electric furnace steelmaking uses graphite electrodes to introduce current into the furnace, and uses the high temperature heat source generated by the arc between the electrode end and the charge for smelting.
(2) Used in submerged electric furnace
The submerged electric furnace is mainly used to produce industrial silicon and yellow phosphorus. Its characteristic is that the lower part of the conductive electrode is buried in the charge, forming an arc in the charge layer, and using the heat energy emitted by the resistance of the charge itself to heat the charge, which requires current High-density submerged electric furnaces need graphite electrodes. For example, about 100kg of graphite electrodes are consumed for every 1t of silicon, and about 40kg of graphite electrodes are needed for every 1t 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 in the furnace are both heating resistors and objects to be heated. Generally, conductive graphite electrodes are embedded at the end of the resistance furnace. In the furnace head wall of the part, the graphite electrode used here is discontinuously consumed.
(4) Used to prepare special-shaped graphite products
The blanks of graphite electrodes are also used for processing into various crucibles, molds, boats and heating elements and other special-shaped graphite products. For example, in the quartz glass industry, 10 tons of graphite electrode blanks are required to produce 1 ton of fused tubes; 100 kg of graphite electrode blanks are required to produce 1 ton of quartz bricks.
