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The chemistry of iron ore and the variation in process parameters decide sinter structure. Indian iron ores are characterized by its high alumina content ( 2.4 wt%), whereas the same used in other countries contains less than 1.0% alumina. This makes the sintering operation under Indian condition quite different from that being practiced all over the world. Several studies have been conducted on tablet samples using analytical materials to study the microstructure of sinter. All these are related to either low alumina levels or lower thermal levels. Ishikawa made studies with materials having Al2O3/SiO2 as 0.2–0.8. Pimenta and Sheshadri studied the structure of pot sinter having alumina 1.2–1.7 wt% and MgO 1.2–1.3 wt%, whereas Indian iron ores have Al2O3/SiO2 2.0 and the sinter has MgO 2.0 wt%. Not much work has been done with this type of materials and this kind of sinter. The movement of flame front along the bed height is one of the key process parameters which affects formation and stabilization of phases in sinter as well as sintering time and productivity. The aim of this work has been to study the sinter structure with high alumina ores under different flame front speed (FFS).

Effect of Flame Front Speed on Sinter Structure of High Alumina Iron Ores