Perch, Michael Koppers Company, Inc., Monroeville, Pennsylvania.
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A coherent, cellular, carbonaceous residue remaining from the dry (destructive) distillation of a coking coal. It contains carbon as its principal constituent, together with mineral matter and residual volatile matter. The residue obtained from the carbonization of a noncoking coal, such as subbituminous coal, lignite, or anthracite, is normally called a char. Coke is produced chiefly in chemical-recovery coke ovens (see illustration), but a small amount is also produced in beehive or other types of nonrecovery ovens.
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