Optimising method for improving granulation effectiveness of iron ore sintering mixture

摘要

The structure of granules has been investigated and a model of granulation determined. The results show that a granule consists of an adhesive layer and a nucleus. Particles with diameter under 0.5 mm act as adhesive fines, while the remainders act as nuclei. By studying the influencing factors of granulation, two significant particle characteristics assessing granulation performance were determined. One is the relative proportion of adhesive fines and nucleus particles, and the other is the specific surface area of adhesive fines. The method of optimising granulation of sinter mixtures is proposed as follows: the proportion of adhesive fines should be 40-50% and the specific surface area should exceed 1000 cm(2) g(-1), which contributes to achieving a better bed permeability, a faster sintering speed and higher productivity.