The effect of dolomite addition on the properties of sinters produced from a high aluminous iron ore

Abstract

This study provides a systematic approach to an evaluation of the sinter properties with increased MgO addition for superfluxed sinters produced from a high aluminous ore. The investigation revealed that part or full replacement of limestone by dolomite in the sinter mix leads to a drop in sinter cold strength, reducibility and production rate, but has a favourable influence on low‐temperature reduction strength and probably better softening and meltdown properties. The change in sinter mineralogy due to the MgO addition has a paramount influence on the sinter properties. The Gua iron ore having a high alumina content, is easily amenable to sintering and the sinters produced can constitute a good burden material because of their high reducibility, good cold and hot‐strength characteristics. Improved production rates can be expected by choosing dolomites having a smaller crystal size or choosing other suitable MgO‐bearing materials. A high circulating load should be expected while producing MgO‐bearing sinters.