Graphite electrode

Graphite electrode is mainly made of petroleum coke and needle coke as raw materials and coal asphalt as binder through calcination, batching, kneading, molding, roasting, graphitization and machining. It is a conductor that releases electric energy in the form of electric arc in the electric arc furnace to heat and melt the furnace charge.

According to its quality index, it can be divided into ordinary power graphite electrode High power graphite electrode and ultra-high power graphite electrode The main raw material for graphite electrode production is petroleum coke. A few of asphalt coke can be added to ordinary power graphite electrode. The sulfur content of petroleum coke and asphalt coke shall not exceed 0.5%. Add both asphalt coke and Needle coke is used produce high power or ultra-high power graphite electrode. The increasing complexity of mold geometry and the diversification of product applications lead to higher and higher requirements for discharge accuracy of spark machine.

The advantages of graphite electrode are easy machining, high removal rate of EDM and less graphite loss. Therefore, some group that based spark machine customers, give up copper electrode and use graphite electrode instead. In addition, some electrodes with special shapes cannot be made of copper, but graphite is easier to reach, and the copper electrode is heavy, which is not suitable for processing large electrodes. In general, the processing with graphite electrode is 58% faster than that with copper electrode. In this way, the processing time is greatly reduced and the manufacturing cost is reducedThese factors cause more and more customers to use graphite electrodes.  

The production cycle of ordinary power graphite electrode is about 45 days, the production cycle of ultra-high power graphite electrode is more than 70 days, and the production cycle of graphite electrode joint requiring multiple impregnation is longer.The production of 1t ordinary power graphite electrode requires about 6000kW · h of electric energy, thousands of cubic meters of gas or natural gas, and about 1t of metallurgical coke particles and metallurgical coke powder.