IDENTIFICATION OF FUSIBLE AND INFUSIBLE SEMIFUSINITE USING RANDOM REFLECTANCE IN COKING COAL

This work was focused at identification and percentage share of semifusinite in coking coal. Coal itself had different random reflectance of vitrinite and carbon content (content of volatile matter). Petrographic analysis (determination of vitrinite, liptinite and inertinite) was extended to inertinite macerals group. Semifusinite determination was carried out by measuring the random reflectance and by observation of its morphology. Subsequently, semifusinite was categorized into three groups according to the theory of boundary equations as fusible, partially fusible and infusible semifusinite based on random reflectance. The overall content of semifusinite in samples of coal was also considered. The results of petrographic analysis were graphically evaluated as fusible semifusinite content versus coal light reflectance plot. According to the above results, the amount of fusible semifusinite accounted for 29 – 44 % of total semifusinite in observed types of coal. This research was part of a larger study of coal types with the requirement for extension of the classical petrographic analysis.