Study on the Characteristics for Low Temperature Roasting Process of Vanadium and Titanium Iron Concentrate Carbon-containing Pellets

Vanadium and titanium iron concentrate pellets conaining carbon after drying,750℃ and 1 000℃ roasting had been used to investigate phase,microstructure,composition and intensity change under low temperature calcination by means of XRD,SEM/EDS,chemical analysis and strength testing.The results show that the vanadium and titanium iron ore concentrate,pulverized coal,water,and com-posite binder mix in accordance with the mass ratio of 100:9:9:1.0,the resulted dry pellets strength is significantly higher than wet pellets.While main phase of pellet roasted at 750℃ show no observed difference with that of dry pellet,but XRD result indicate increasing Fe₃O₄ peak intensity.The gap be-tween the mineral powder particles increases and strength of pellets dramastically decreases.Roasting temperature of 1 000℃ generates main phase of pellet composing of Fe₂TiO₄ and reduced iron,and cau-ses pellets shrinkage and thus strength increase.