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Synopsis : In order to clarify the influences of iron ores on their sintering performance based on their mineralogical properties, assimilation experiments of iron ores and artificial ores prepared from reagents were carried out. The assimilation rate of are and the microstructure of assimilated portion differed greately among ores. Dense quartz-bearing Ore-A, a representative one of group-a classified according to mineralogical properties, was difficult to assimilate and porous pisolite Ore-D containing clay as gangue minerals (groupd),bycontrast,assimilatedveryrapldly. While the assimilated portion of Ore-A consisted of acicular calcium ferrite that had adhered firmly on the surface of unmelted are particle, that of Ore-D comprised of very small granular hematite grains, glassy silicate and very large pores and seemed very brittle. Ore-C containing clay ( medium group c) showed the intermediate behavior between those of Ore-A and Ore-D. By the assimilation experiment of artificial ores, an assimilation rate equation expressed as functions of temperature, pore volume of are and phase composition of gangue minerals was developed. On the basis of such a relationship between mineralogical prorerties of are and its assimilation behavior, the deterioration in sintering operation as the various are brands were interchanged could be clearly explained.

Effect of Mineralogical Properties of Iron Ore on Its Assimilation with Lime