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Abstract

Heat transfer during iron ore sintering has not been given due consideration since the important concepts were developed. Convective heat transfer during sintering is extremely important as it determines the flame-front speed and, consequently, productivity and sinter quality. Concepts developed in chemical engineering heat transfer are put forward as a means of understanding the factors that determine the flame-front speed. The definition of heat and flame fronts, the roles of convection, conduction and radiation in heat transfer, the effect on convective heat transfer of air flow velocity through the bed, the importance of heat transfer from the flame front and the effect of the thermal capacities of the solids and gases on convective heat transfer are discussed. The properties of the available heat during melt formation are also considered as being important in sintering. The influence of an increase in the proportion of porous ores, which are assimilated more readily than denser ores, is assessed by application of these concepts. The porous ores should be assimilated preferentially to form melt since the energy required for their assimilation is less.

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Changes in heat transfer when sintering porous goethitic iron ores

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