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。

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Commonly used for cast iron carbon additive materials are: artificial graphite, calcined petro coke, nature graphite, coke, and as the mixture with these materials.

人造石墨、煅烧石油焦、天然石墨、焦炭、以及用这类材料配成的混合料。

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