Investigation the iron ore fine granulation effects and particle adhesion behavior in a horizontal high-shear granulator

Abstract

This work presents a study of the granulation of iron fines in a horizontal high shear granulator. Both experiments and DEM simulations were conducted to investigate the effect of water content, impeller rotational speed and particle sizes on granulation performance. The experimental results showed that the granule size increased with increasing water content, but the granules had the most uniform size at 8% of water content. The DEM model was developed to understand the inter-particle force, particle motion and adhesion during granulating. The results show that the liquid bridge force and the amount of bonded small particles increased with increasing water content, resulting in larger granules with wider granule size distributions. Increasing impeller speed also increased granulation efficiency due to increased collisions between particles. The simulation of the granulation of particles with different size ratios showed that granulation efficiency increased with increasing size ratios of nucleating and adhesive particles.