Coal Properties for Coke Production

The properties of the coke are influenced by the coal or coal blend from which the coke is made as well as by the carbonizing conditions used. The rank of the coal or the average rank of the coal blend used affects the properties of the coke product. The choice of a suitable coal is crucial to quality control of the coke, and coke producers blend coals to manipulate coke characteristics. The practice of blending coals was originally developed to eliminate difficulties that were encountered when carbonizing highly fluid coals but was later used to stretch supplies of scarce or costly ideal-caking coals and quickly became the principal method for manipulating coke characteristics.

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