Effect of Variation of Alumina on Development of Phases during Iron Ore Sintering

A comparative study of two Indian ores, one with usual alumina level and another with available low alumina level, was made to understand the final structure and its evolution for low and high alumina sinters. A split circular pot of 40 cm height was used in the tests and three different thermocouples were inserted at three locations in the pot along the height at a distance of 10 cm, 20 cm, and 30 cm. The results show that the standard deviation of FeO in all samples except that for melt zone of high alumina ore is about 0.5. No difference in the maximum bed temperature at two levels of alumina in iron ore is observed. The solidification of the liquid present in the melt zone is a result of partial mixing of melt of the melting zone. Oxidation of iron oxide phase present at a certain thermocouples result in secondary hematite and magnetite found on the top.