Abstract
A systematic study of the preparation and metallurgical properties of magnesia flux pellets was used to elucidate the mechanism for oxidation and consolidation occurring during oxidative roasting. The compressive strength of the finished pellets was 3545 N/P. With sufficient basicity and MgO contents, magnetite (Fe)x[Fe]2O4 and maghemite γ-Fe2O3 with spinel-type crystal structures combined with MgO/CaO to form nonstoichiometric MgxFe1-xFe2O4 (0 < x < 1) and CayFe1-yFe2O4 (0 < y < 1). With higher basicity and MgO contents, the participation of CaO/MgO was the driving force for gradient conversion from olivine Fe2SiO4 to olivine MgxCa2-xSiO4. The CaO/MgO combined with magnetite (Fe)x[Fe]2O4 and maghemite γ-Fe2O3 to form stable (Ca, Mg)xFe1-xFe2O4, CaFe2O4 and CaFe3O5, thereby inhibiting recrystallization of the pellets and resulting in poorer metallurgical properties of the magnesia flux pellets.
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