Abstract
Three types of fly ash of different Australian brown coal collected by bag filters and combusted in an industrial test furnace with a same furnace condition, were fractionated in particle size (149-75, 75-45, 45-25, 25-20, 20-10, 10-5, <5 μm) and density (<1.6, 1.6-2.0, 2.0-2.4, 2.4-2.8 2.8-3.2, >3.2 g/cm3) by means of Nylon sieves ultrasonically. Nine morphological types were classified and film-like particles rich with sulfur were found specifically only in that of Saxonvale coal. Fraction distribution, elemental distribution and morphological distribution give rich informations on their ash softening property, combustibility of coals and their combustion conditions.
