A number of laboratory-scale analytical procedures have been developed for characterization of the swelling, thermoplastic and contracting nature of bituminous rank coking coals. The purpose of these procedures is to define the relative quality of coals with respect to their ability to produce good quality metallurgical coke. These procedures also ensure that the coals selected will not be harmful to the coke ovens. In many respects, the laboratory-scale tests fall short of these goals and largerscale pilot-oven tests must be employed. Part VIII of this series will review some of these important analytical procedures and provide ideas as to their uses and limitations.
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