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

摘要

A trend can be seen in the phases present in sinter at different FFS. The hematite content increases at higher FFS. This is an evidence of faster oxidation of the melt. The hematite phase in sinter contains much higher Ca and Mg than the original materials. This indicates that this hematite has formed by dissociation of SFCA and is of secondary type. Evidence were found of higher diffusion of Al and Si into hematite. The composition of SFCA were affected by FFS. At higher FFS, SFCA was having higher Fe and lower Si and at lower FFS, it contained lower Fe and higher Si. Based on our results, a modified flow chart of formation of phases in high alumina sinter is proposed.