Effects of Quicklime Digestion Behavior on the Granulation of Vanadium Titano-magnetite Concentrate

Effects of quicklime digestion behavior on the granulation of the vanadium titano-magnetite concentrate were investigated by using micro-drum granulation equipment.The results show that there exist great difference in the particle size distribution index（PDI） of different kinds of quicklime after hydration with water.The main reasons for the great difference of PDI are chemical composition and mineral structure.The PDI has positive correlations with the granulation index（GI）,uniformity index（UI）,and resistance index of the thermal disintegration（KI）,but has negative correlations with the damage index（DI） of vanadium titanium magnetite concentrate.The effect of PDI on the DI is comparatively low for low-titanium magnetite concentrate compared with the other two concentrates.The quicklime with high particle size distribution index is good for its uniform distribution in the sinter mixture.The heat from hydration action of the quicklime can make the lime particles in the quasi-particles shrunk,and the particles in the quasi-particles are bonded more tightly and the isotropic thermal stress is more balanced,which is beneficial to the improvement of the hot property of the quasi-particles.