Interfacial Phenomena of Sinter Melt on a Sintered Hematite Substrate–Effects of Temperature and Melt Composition

摘要

In iron ore sintering,interfacial phenomena play a predominant role in sinter melt formation and therefore sinter quality.In this study,a high-temperature visualisation system was used in conjunction with optical and scanning electron microscopy to investigate the effects of temperature and melt composition on the interfacial phenomena and on the interactions of sinter melt with a sintered hematite substrate.The wettability and interactions between monocalcium ferrite melt and the hematite substrate were found to be improved with increasing temperature.Addition of Al2O3 or SiO2 improved the wetting behaviour of the melt on the sintered hematite substrate when their concentration was less than 6 wt.％.However,addition of MgO appeared to make the melt less wetting.Interaction was observed at the interface between the sinter melt and the sintered hematite substrate to a degree depending on respective melt composition.It was essentially dissolution of hematite from the substrate into the melt rather than penetration of the melt into the substrate along the grain boundaries.This could lead to compositional change of sinter melt and changes of sinter melt properties.