Abstract
A new testing method for evaluating the extent of disintegration during the reduction at 550°C in a 30% CO-N2 atmosphere has been applied to synthesized oxides, and the influences of (1) large size hematite crystals and (2) the addition of Al2O3 on the extent of disintegration have been studied. In the method, samples are crushed by an impact and the extent of disintegration is evaluated from the change in fragility due to the reduction. The results obtained by the new testing method are summarized as follows:(1) Although large size hematite crystal is proposed to be responsible for the disintegration of iron ore sinter tested by the RDI method, the new method shows that the extent of disintegration for the sample containing large size skeletal hematite crystals slightly differs from the one containing small size granular hematite crystals.(2) The addition of Al2O3 to the Fe2O3 CaO-SiO2 system brings about large increase in extent of disintegration even though the added amount is 1.5wt%. This is attributed mostly to a decrease in mechanical strength of minerals in which most of Al2O3 is concentrated.
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