An iron ore sinter mix subjected to different thermal and physical conditions during sintering. Based on these differences it is possible to divide a sintering bed into different zones, all of which have a profound influence on sintering performance and sinter quality. A good framework on which to understand the science of sintering better is to consider material behaviour in each of these zones. Sinter FeO, which is a popular sinter plant control parameter, is considered first by examining how conditions in the different zones could alter the magnetite content of the sinter. This is followed by a more detailed treatment of the melting/reaction zone. The importance of melt properties/volume has been considered to have an effect on sintering, but the reasons are not well-understood. Based mainly on quenched sintering beds, important structural changes in the melting/reaction zone are identified, and the possible effect of melt properties/volume on the structure of this zone discussed. The final area discussed in the paper concerns the influence of the other zones, in particular their structure, on sintering productivity.
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