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'''Coke''' is made by heating [[coal]] in the absence of air. The volatile components of the coal are driven off as a gas and the remaining solid is coke. The [[steel industry]] is a major consumer of coke. Coke was formerly made in "beehive ovens" and the gas was wasted.
<ref>http://www.iup.edu/archives/coal/mining-history/history-of-coke/</ref>
<ref>http://patheoldminer.rootsweb.ancestry.com/coke2.html</ref>
Modern coking plants recover the gas which, after purification, can be used as a fuel.
==Petroleum coke==
Petroleum coke is a similar material obtained as a by-product of the "cracking" of [[petroleum]].
==References==
{{reflist}}
[[Category:Energy]]
<ref>http://www.iup.edu/archives/coal/mining-history/history-of-coke/</ref>
<ref>http://patheoldminer.rootsweb.ancestry.com/coke2.html</ref>
Modern coking plants recover the gas which, after purification, can be used as a fuel.
==Petroleum coke==
Petroleum coke is a similar material obtained as a by-product of the "cracking" of [[petroleum]].
==References==
{{reflist}}
[[Category:Energy]]