Question

Which type of compound is made by hydrothermal process of fly ash?

Answer 1

The main components of coal fly ash are the oxides of Si and Al, various metallic oxides and unburned carbon. The X-ray diffraction patterns for coal fly ash are shown in Fig. 1(a). It is confirmed that quartz (SiO2) andmullite (3Al2O. 2SiO2) mainly exist as crystalline substance in coal fly ash.