Synthesis of Cordierite from the High-alumina Fly Ash and Talc Powder Mixtures

There is much more profit in synthesis of cordierite from high-alumina fly ash, comparing with common fly ash. In this paper, the high-alumina fly ash collected from the Jungar power plant was calcined, grinded, beneficiated with HCl, diluted and dried. Furthermore, the cordierite was conducted from the purified fly ash and talc powder mixtures by solid reaction sintering. The physical properties of the cordierite samples were measured using Archimedes' method, and the phase of cordierite samples was analyzed by XRD and the microstructure of the cordierite samples was observed by SEM. The results show that the cordierite, based on the proportion of the treated high-alumina fly ash and talc powder designated as 1.515/1 at 1350 degrees C or/an 1370 degrees C for 2h or/and 3h, could meet the quality requirement of physical properties, and the major crystalline phases in the sintered samples were predominantly a-cordierite (indialite) with minor crystals of mullite, spinel and almost no glassy matter.