ROASTING CHARACTERISTICS OF OXIDIZED PELLETS OF VANADIUM-TITANIUM MAGNETITE CONCENTRATES

摘要

The roasting characteristics of oxidized pellets of VTM(Vanadium-titanium magnetite) concentrates were studied systematically in this paper. The preheating and roasting behaviors of VTM pellets were taken into comparisons with those of ordinary pellets. The results showed that compared with the ordinary oxidized pellets, under the same preheating and roasting conditions, FeO contents in preheated and roasted pellets of VTM concentrates were higher, which contributed to the lower compressive strength of the pellets. Therefore, the preheating time and the roasting temperature should be enhanced by 10min and increased from 1220°C to 1250°C respectively, so the compressive strength of preheated pellets and roasted pellets are more than 400N/P and 2500 N/P respectively. The reason for this was that the oxidization velocity of VTM pellets was slower, which hindered the growth of Fe_2O_3 crystals in pellet.