Reduction Degradation Index- When the iron ore converts from haematite to magnatite its structure changes from hexagonal to cubic in 950 degree centigrade and in such a case some fines are generated. The generation of fines in percentage is called Reduction Degradation Index. It should be 5% approx. Lower the RDI selection of Ore will better. In DRI process lower RDI is suitable. Higher the RDI accretion or agglomeration formation will more.
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