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Graphite electrode related knowledge and its application fields

wallpapers Industry 2020-10-22
Graphite electrode related knowledge and its application fields  | TRUNNANO
 
Graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, coal tar pitch as a binder. They are made by calcination, batching, kneading, pressing, roasting, graphitization, and machining. It releases electric energy in the form of an electric arc in an electric arc furnace. The conductors that heat and melt the charge can be divided into common power graphite electrodes, high power graphite electrodes and ultra-high power graphite electrodes according to their quality indicators.
The primary raw material for graphite electrode production is petroleum coke. A small amount of pitch coke can be added to common power graphite electrodes, and the sulfur content of petroleum coke and pitch coke cannot exceed 0.5%. Needle coke is also needed when producing high-power or ultra-high-power graphite electrodes. The primary raw material for aluminum anode production is petroleum coke, and the sulfur content is controlled not to exceed 1.5% to 2%. The petroleum coke and pitch coke should meet the relevant national quality standards.
                  
      


       
Main application areas:
(1) For electric arc steelmaking furnace
Electric furnace steelmaking is a big user of graphite electrodes. My country's electric furnace steel output accounts for about 18% of crude steel output, and graphite electrodes for steelmaking account for 70% to 80% of the total graphite electrode consumption. Electric furnace steelmaking uses graphite electrodes to introduce current into the furnace. It uses the high-temperature heat source generated by the arc between the electrode end and the smelting charge.
(2) Used in the 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 from the account itself's resistance to heat the task, which requires current The higher-density submerged electric furnace needs graphite electrodes. For example, it consumes about 100kg of graphite electrodes to produce 1t of silicon, and about 40kg of graphite electrodes are required in order to make 1t of yellow phosphorus.
(3) 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 objects to be heated. Generally, conductive graphite electrodes are embedded at the end of the resistance furnace. In the furnace headwall 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 to process various crucibles, molds, boats and heating elements into special-shaped graphite products. For example, in the quartz glass industry, 10t of graphite electrode blank is required for every 1t of fused tube produced; 100kg of graphite electrode blank is necessary for every 1t of quartz brick produced

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Tag: Graphite electrode