Calcination of petroleum coke can yield almost pure carbon or artificial graphite suitable for production of electrodes, motor brushes, dry cells, etc.
石油焦的煅烧可产出几乎纯的碳或人造石墨，适于生产电极、电机刷和干电池等。
2
Commonly used for cast iron carbon additive materials are: artificial graphite, calcined petro coke, nature graphite, coke, and as the mixture with these materials.