Beneficiation of Collie fly ash for synthesis of geopolymer: Part 1 - Beneficiation

► Sieving of the ash leads to a noticeable reduction in quartz and carbon. ► Milling of the ash shows a significant increase in surface area and reactivity. ► Removal of crystalline iron from the ash results in a reduction in particle size. ► The majority of amorphous carbon in the fly ash is present as very fine particles. ► Quartz is present in the ash as primary quartz and secondary quartz.