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Coke (fuel)
Coke (fuel)
'''Coke''' is made by heating [[coal]] in a retort in the absence of air. The volatile components of the coal are driven off as a gas (coal gas) which, after purification, can be used as a fuel. The solid remaining in the retort is coke.
In the 21st century, coal gas has largely been replaced by [[natural gas]] but coke is still made for use as a [[reducing agent]] in the [[steel industry]].
Petroleum coke is a similar material made from crude oil.