How graphite electrodes are made? raw material for graphite electrodes
By:Amanda Dec 11, 2020
Graphitization is the use of thermal activation to orderly convert thermodynamically unstable carbon atoms from chaotic layer structure to graphite crystal structure. So let DanCarbon talk about How graphite electrodes are made? raw material for graphite electrodes & graphite electrode chemical composition.
1.How graphite electrodes are made?
Electrodes are made of graphite because only graphite can withstand such intense heat. The furnace is then tipped on its side to pour the molten steel into giant buckets called ladles.There is petroleum-based needle coke and coal-based needle coke, and either can be used to produce graphite electrodes.
Click on the link to read: Graphite electrode manufacturing process
2. raw material for graphite electrodes
Petroleum coke is the most important raw material, and it is formed in a wide range of structures, from highly anisotropic needle coke to nearly isotropic fluid coke. The highly anisotropic needle coke, due to its structure, is indispensable for the manufacture of high-performance electrodes used in electric arc furnaces, where a very high degree of electrical, mechanical and thermal load-bearing capacity is required. Petroleum coke is almost exclusively produced by the delayed coking process, which is a mild slow carbonising procedure of crude oil distillation residues.
Needle coke is the commonly used term for a special type of coke with extremely high graphitizability resulting from a strong preferred parallel orientation of it’s turbostratic layer structure and a particular physical shape of the grains.
3. graphite electrode chemical composition
60% of graphite electrode production cost comes from raw materials, using petroleum coke, needle coke as aggregate, coal asphalt as binder.
Graphitization is the use of thermal activation to orderly convert thermodynamically unstable carbon atoms from chaotic layer structure to graphite crystal structure. Therefore, in the process of graphitization, high temperature heat treatment (HTT) is used to provide energy for atomic rearrangement and structural transformation. In order to improve the graphitization degree of the non-graphitizable carbon materials, a method of adding a catalyst may also be used, which is called catalytic graphitization.