| Abstract |
| Three kinds of calcium ferrites, predominant phases in iron ore sinter, were produced by the sintering of a mixture of iron, calcium, silicon and aluminum oxides to understand the phases formation process and to evaluate the properties of sinter phases. The synthesized binary, ternary and quaternary calcium ferrite phases were analyzed by microscopic, X-ray diffraction and energy dispersive analysis method and reduced at 550℃ with CO gas for reduction degradation strength test. The addition of Al2O3 to Fe2O3CaO or Fe2O3-CaO-SiO2 system encouraged the formation of calcium ferrite and prevented hematite. The same effects were obtained by adding CaO, whereas Si02 promoted the hematite formation when insufficient of CaO provided to the system. Adding SiO2 to the system more than 6%, Fe2O3 did not participate to form calcium ferrites and precipitated as skeletal rhombohedral hematite phase which has poor reduction degradation strength. As the CaO content in calcium ferrites increased, reduction degradation strength of sinter was improved. |
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| Key Words |
| Iron ore sinter, Calcium ferrites, Reduction degradation strength, Al2O3, Hematite |
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