Graphite electrode is mainly made of petroleum coke and needle coke as raw materials and coal tar pitch as binder through calcination, proportioning, kneading, pressing, roasting, graphitization and machining. It is a conductor that releases electric energy in the form of electric arc to heat and melt the charge in the electric arc furnace. According to its quality index, it can be divided into ordinary power, high power and ultra-high power.
The graphite electrode comprises:
(1)Common power graphite electrode. Graphite electrode with current density less than 17A / cm2 is allowed to be used in common power electric furnaces for steelmaking, silicon smelting and yellow phosphorus smelting.
(2)Oxidation resistant coating graphite electrode. A graphite electrode coated with an anti-oxidation protective layer (graphite electrode anti oxidant). Forming a protective layer which can conduct electricity and resist high temperature oxidation can reduce the consumption of electrode in steelmaking, prolong the service life of electrode and reduce the electric energy consumption of electrode. The popularization and application of this technology can bring such economic and social effects as follows: 1. The unit consumption of graphite electrode is less, and the production cost is reduced to a certain extent. ② The graphite electrode consumes less electricity, saves the unit electricity consumption of steelmaking, saves the production cost, saves energy! ③ Because the graphite electrode is replaced less times, the labor amount and risk coefficient of operators are reduced, and the production efficiency is improved. ④ Graphite electrode is a high consumption and high pollution product, which has a very important social significance in the days of promoting energy conservation, emission reduction and environmental protection. This technology is still in the stage of research and development in China, and some domestic manufacturers have begun to produce it. It is widely used in Japan and other developed countries. At present, there are also companies that import the anti-oxidation protective coating in China.
(3)High power graphite electrode. Graphite electrode with current density of 18-25A / cm2 is allowed to be used in high power electric arc furnace for steelmaking.
(4) Ultra high power graphite electrode. Graphite electrode with current density greater than 25A / cm2 is allowed. It is mainly used in ultra high power EAF
