CONSTITUTIONAL EVALUATION OF HIGH AL2O3 SINTER BY EPMA SWEEPING AREA ANALYSIS

To investigate the role of Al2O3 in iron ore sinters, constitutional a nalysis of high Al2O3 and low Al2O3 contained iron ore sinters was car ried out by applying EPMA random sampling method. Measured composition s were mainly located around the two tie lines of CaO . SiO2-CaO . 3(F e, Al)(2)O-3 and 2CaO . SiO2-(Fe, Al)(2)O-3. It was found that Al2O3 h ad a tendency to concentrate in calcium ferrite, especially in that of composition of Fe2O3 from 40% to 60%. MgO content in sinter ore decre ased with SiO2, but CaO content increased with SiO2. This reverse tend ency suggests that the role of CaO and MgO in iron ore sinters can be different.