Density separations of a South African coal have been carried out. The coal was provided as a pf sample and was screened to provide a -53+38 urn size fraction from which tight density fractions (0.02 gcm~(-3) intervals) were produced in a heavy liquid medium by the float-sink procedure. Each density fraction was characterised using manual maceral analysis and a new automated image analysis technique called the Reactivity Assessment Program. The reactivity of the density fractions was assessed using a drop tube furnace at a temperature of 1300°C, residence time of 100 milliseconds and 1% oxygen atmosphere. The morphology of the chars produced in the drop tube furnace was quantified using an automated image analysts technique. This allowed the predicted reactivity of the fractions to be correlated against actual burnout characteristics.
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