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Calcium ferrite is the most basic bonding phase in sinter and the matrix of Silico-ferrites of calcium and aluminium (SFCA). In order to better understand the fundamentals of the reduction of CaO·Fe 2 O 3 , CaO·Fe 2 O 3  samples were prepared by solid-state sintering and reduced by CO/CO 2  mixture gas at 1000°C. Then, the equilibrium phase and morphology were tested by XRD and SEM-EDS. The experimental results indicated that (1) As CO/(CO + CO 2 ) = 20%, CaO·Fe 2 O 3  was reduced to CaO·FeO·Fe 2 O 3  and 2CaO·Fe 2 O 3 . (2) As CO/(CO + CO 2 ) = 40%, CaO·FeO·Fe 2 O 3  was reduced to CaO·3FeO·Fe 2 O 3  and 2CaO·Fe 2 O 3 , the equilibrium phases were CaO·3FeO·Fe 2 O 3  and 2CaO·Fe 2 O 3 . (3) As CO/(CO + CO 2 ) = 60%, CaO·3FeO·Fe 2 O 3  was reduced to FeO and 2CaO·Fe 2 O 3 , and 2CaO·Fe 2 O 3  was still the stable phase. (4) As CO/(CO + CO 2 ) = 80%, FeO was reduced to metallic Fe, and 2CaO·Fe 2 O 3  was reduced to metallic Fe and CaO. The finding from this work may be used as a theoretical foundation for the research of the reduction of SFCA.

Fundamentals of reduction of CaO·Fe 2 O 3 in CO/CO 2 gas at 1000°C