Abstract: Due to the low intensity of hematite pellets, the influences of the alkalinity, the fuel flux and their interactions on the intensity of hematite pellet were studied, taking a Brazilian hematite concentrate as research target. The results showed that when preparing flux magnesium-bearing hematite pellet, the compression strength of preheated pellets and roasted pellet were significantly improved under the alkalinity of 0.3~1.2.When preparing the acidic magnesium hematite pellet with fuel flux, the intensity of preheated pellets was improved but the compressive strength of roasted pellets were less affected with the coke ratio of less than 1.0%. When preparing the fluxed magnesium hematite pellets with the fuels, the intensity of roasted pellets was greatly improved with the coke ratio of less than 1.5% and pellet alkalinity at 0.9.  Thus, the preparation of fluxed magnesium hematite pellet with fuel is an effective way to improve the intensity of hematite pellets.

Key words: Hematite pellet, Alkalinity, Fuel flux, Pelletizing intensity