RESULTS OF COKE MICROSCOPY WITH THE AID OF VARIOUS RESEARCH METHODS

The measurement of coke structure developed by E. Hoffmann and F. L. Kuhlwein is critically considered, and the characteristics of a homogeneous coke and the lack of homogeneity in coke structure is investigated. Possible non-homogeneity in coke structure may be unmelted or poorly softened grains, slime aggregates, or a strongly variable optical character. The first two nonhomogeneities mentioned affect hardness properties; the last affects reactivity and probably thermal loss in oven operation. Relationship between optical character of coke and its reactivity or conductivity and the relation of reactivity and conductivity are described.--Auth.