Effect of Rapid Cooling on Retaining the Amorphous State of Rice Husk Silica Upon Combustion

Highlights:・Precise temperature control enabled the investigation of temperature-dependent events・Slow cooling encourages the growth of cristobalite after RH combustion・SEM observation revealed the fusion of RH silica due to melting, resulting in crystallization・For RH ash, the cooling rate has as important an effect on crystallization as does the maximum temperature・A new strategy is proposed to obtain amorphous silica from RH