Abstract
The effects of feed properties on the granulation of iron ore sinter feed have been studied using simplified sinter mixes. A measure of granulation effectiveness, x 0.5, has been defined as the particle size at which half the particles act as adhering particles and half as nuclei particles. High values of x 0.5 correspond to large mean granule sizes. The granulation effectiveness is a strong function of the moisture available for granulation which is the total moisture less moisture absorbed by the sinter feed components. The amount of moisture absorbed varies widely with ore type. The effect of feed particle size distribution is complex. Granulation effectiveness decreases with increasing amount of fines (−0.25 mm) but increases as the mean size of these particles decreases. A mechanistic model of the granulation process is proposed in which the granulation effectiveness is related to the strength of the adhering layer of fines. This model explains well the observed relationships between granulation effectiveness and feed properties and may be used as the basis of a mathematical model of the granulation process.
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