Effects of Specific Surface Area on Granulation Behavior of Vanadium Titano-magnetite Concentrate

Effects of specific surface area on the granulation behavior of the vanadium titano-magnetite concentrate（VTM） were investigated using micro-drum granulation equipment. The results show that the particle morphology of the VTM mainly present irregular shape,part of them are lamellar and globular structure.Their specific surface area and average particle size have a negative correlation,but there exist great difference in the particle surface roughness of different kinds of VTM. When the particle size of the VTM is small,there is no evident relationship between the specific surface area and uniformity index（UI）,and the effects of the particle morphology on granulation index （GI）,resistance index of the thermal disintegration（KI） and damage index（DI） are greater than the specific surface area.At this moment,the restrictive link for the VTM granulation are the compact structure and smooth morphology of the iron ore particles.The main reason is that the adhesion among VTM granules is relatively week,when the quasi-particles are subjected to the mechanical shock and hot air flow,the adhering layer of the quasi-particles is easy to fall off,leading to the destruction of the quasi-particle structure.In order to increase the adhesive capacity of iron particles,and improve the strength and thermal stability of the quasi-particles,the iron-bearing materials with relatively rough and good hydrophilicity or some kinds of additives should be added in the VTM granulation process.