| Present study was carried out to investigate the effect of alumina content of sintered ore on the degradation. In order to investigate the effect of the crystallization depending on alumina contents, temperature and cooling rate, the tablets composed of first grade reagent were sintered in a electric furnnace. RDI(Reduction Degradation Index) was based on JIS(Japanese Industrial Standard) measured as a degree of reduction degradation. Optical microscopy, XRD, EDX, SEM and microhardness test were used to investigate the morphologies and properties of the iron ore sinter. Iron oxide transformed to another phases such as calcium-ferrite which resulted in the deterioration of RDI when the alumina contents was increased. With the results of SEM and EDX, the microcracks were found in glassy silicate when SFCA(Silico-Ferrites of Calcium and Aluminum) was crystallized. It was found that the more alumina contents was increased, the more microcracks were observed. |
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