Preparation of Oxidized Pellets with High Chromium Vanadium-Titanium Magnetite

The effects of the high chromium vanadium-titanium magnetite ores on the oxidized pellet preparation process and metallurgy properties were investigated and its largest mass fraction for superior quality of the oxidized pellets was also explored according to the research on fundamental characteristics of the ores.The results showed that the high chromium vanadium-titanium magnetite mainly composed of magnetite,magnesioferrite,chromite,geikielite,coulsonite and titanomagnetite etc.,of which the particle size was large,and crystal stock strength was low.With the increase of the mass fraction of high chromium vanadium-titanium magnetite in the raw materials of the pellets,the properties of green pellets had no significant changes,but the compressive strength of the finished oxidized pellets decreased,when the mass fraction of the ores was greater than 20%,the compressive strength couldn't meet the requirement of the blast furnace production.On the other hand,increasing the mass fraction of high chromium vanadium-titanium magnetite was conducive to reduce the reduction swelling rate of the pellets.When its mass fraction increased from 0 to 20%,the reduction swelling rate decreased from 32.1% to 21.1% accordingly.