Various sinter microstructures were produced in the laboratory using the same iron ore blend, varying only the sinter basicity and the carbon content of the blend via limestone and coke additions, respectively. The sinter cakes were subjected to low temperature, size degradation tests and their structural composition was determined. A relationship has been established between sinter structural composition and its size degradation under low temperature reducing conditions. Also, varying the gas composition led to development of a new reduction test procedure, which is more sensitive to microstructural variations than the conventional standard test (reduction degradation index, RDI).
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