Abstract
Effects of CaO and FeO additives on ash fusion and fusion behavior of the blending coal ashes exhibiting a wide range of fusion temperature have been investigated under reducing atmospheres.
(1) Fusion temperatures of ash with CaO and FeO were greatly lowered and were almost equal to the lowest eutectic point in the SiO2-CaO-FeO phase diagram system. The optimum chemical composition corresponding to the minimum fusion temperature was CaO: FeO=0.2-0.6: 1 (by weight).
(2) A multiple regression equation, which was derived from the correlation between chemical compositions such as SiO2, Al2O3, CaO and FeO and fusion temperature, was proposed (correlation coefficient=0.95).
(3) High temperature fusion behavior of blending coal ashes showed a good correlation with the multiple regression equation.
