Petroleum coke, also called

petcoke

, is a rocklike leftover of the oil refining process. Energy can be created from petroleum coke, so it is often turned into dry cells and fuels based on the type of coke it is. There are several classifications of petroleum coke, and each one is used to create different substances.

Calcined petroleum coke is made when petroleum coke is calcined, or roasted, just below the melting point. This coke is commonly used in the smelting industry for the creation of metals such as titanium, aluminum and steel. This is because calcined coke is used as an anode to produce these metals.

The largest single nonfuel use of petroleum coke is in the manufacture of carbon anodes for the aluminum smelting industry which accounts for almost 80 percent of all petroleum coke produced.

Petroleum coke (Pet coke or petcoke) is a carbonaceous solid that is derived from oil refinery coker units or other cracking processes. It is over 90% carbon.