THE ROLE OF PRIMARY SLAG FORMATION ON HEAT-TREATMENT OF IRON-ORE PELLETS

When iron ore pellets are subjected to oxidizing roasting the temperat ure at which a liquid phase appears and its physicochemical properties determine the process variables of heat treatment. The results of stu dies of model systems comprising pure oxides fail to reflect the featu res of the mechanism of phase transformations occurring on hardening o f pellets made of ores from different deposits. The direction of phase formation reactions during the solid and liquid sintering stages, the rate and extent of interaction of charge components determine the che mical composition and thermal properties of silica-containing phases o f ores when pellets with natural basicity are produced, of ore and flu x if the pellets are fluxed.