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It is well known that calcium ferrites (CaO·2Fe2O3, CaO·Fe2O3 and 2CaO·Fe2O3) formed during the iron ore sintering process can improve the mechanical strength and the reducibility of the sinters.1–3) A considerable amount of works were focused on the structure characterization and formation mechanism of calcium ferrite phases during the sintering process under various O2 content atmospheres at the temperatures higher than 1 100°C.4–10) Generally, solid state reactions and phase constitutions during the sintering process can be thermodynamically predicted using the equilibrium phase diagram. However, the phase transformation process at lower temperatures will be different from the predicted phase. And little attention has been paid on the reaction between CaO and Fe3O4 under CO–CO2 atmosphere at 800°C–1 100°C, and it is uncertain whether CaO·xFe2O3 is formed under these conditions. High calcium type tin, iron-bearing tailing is recognized as one of typically complex iron ore resources in China. Our previous researches indicated that the iron mineral in the tailings was goethite, while calcite was the main gangue minerals.11) A process of magnetizing roasting followed by magnetic separation was efficient to recover iron values from the tailings, and the calcium and tin-bearing minerals were separated into non-magnetic materials. Nevertheless, the iron recovery decreased obviously as the roasting temperature was higher than 850°C, and the effect of CaO on the phase transformation of iron oxides was still unclear. Previous researches have studied more about the convert of iron oxides during the magnetizing roasting process,11–14) Reaction between CaO and Fe3O4 under CO–CO2 Atmosphere at 800°C–1 100°C

Reaction between CaO and Fe<sub>3</sub>O<sub>4</sub> under CO–CO<sub>2</sub> Atmosphere at 800°C–1100°C