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Line 1: − '''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}}
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