The authors investigate the influence of the basicity index CaO/SiO2 on the sintering properties of hematite ore mixtures. The experimentation was performed with three different mixtures of ores from Tazadit, Nimba, Mano-River, Itabira, Marcona, Goa, Mapawa and Cassinga. Increasing the basicity index CaO/SiO2 between 0.1 and 3, chiefly through limestone admixture makes possible to reduce the thermal consumption of sintering and to improve the physical and chemical properties of the sinter. In the case of a plant using hematite ores, it seems interesting to produce an hyperbasic sinter and to complete the blast furnace burden with calibrated ore or acid pellets.
Characteristic Data of Ores and Additive
In order to determine the effect of an increased basicity index on the sintering properties of several mixtures of hematite ores, we have considered three series of experiments:
- The first concerned a mixture of ores from Tazadit, Nimba and Mano-River
- The second concerned a mixture of ores from Itabira, Marcona and Mano-River.
- The third concerned a mixture of ores from Goa, Mapawa and Cassinga.