In this paper

the ash fusion characteristics and mineral behavior of individual coal ash and a series of two-component blendsd ashes are studied.The samples are heated progressively from(IT)at 100?℃intervals in reducing atmosphere.Mineral composition and type at each temperature interval are determined by X-ray diffraction (XRD)analysis.For different coal ashes

the main mineral matter at 800?℃is quartz

anhydrite and hematite

calcite and feldspar.With increasing temperature

oxidation

thermal decomposition

transformation and reaction occur between the components.It can be seen that quartz

anhydrite decrease and anorthite

gehlenite increase.At about 1200?℃

all of mineral diminish and a glass phase is formed.Some combinations of mineral in component coal produce low-melting eutectic composition at a high temperature and this is the main reason causing the non-arithmetic average of softening temperature of blends ash.