【Abstract】 In this paper, muffle furnace and 4 corners combustion furnace are chosen to heat andburn the coal ash and raw coal. The vartiation of components of mineral matters duringheating is analysised by XRD. It shows that the behavior of mineral matters in coal ash in 4corners combustion furnace is similar to that in muffle furnace, and the behavior is greatlyrelated to the compositions and amounts of raw coal.更多还原