Development and validation of a mathematical model for the moving grate induration of iron ore pellets

Abstract

A mathematical model is described for the induration of iron ore pellets on a moving grate. The validity of the model has been demonstrated, both for the performance of an operating plant and for the firing of pellets in a laboratory pot grate furnace. The model permits calculation of pellet bed temperature profiles and the resulting product quality, together with overall heat and mass balances for the induration machine. Indications are also given of the occurrence and extent of the spalling that can occur during removal of both free and chemically combined water in the drying stages. The work has demonstrated the significant effect of gas composition on pellet temperatures and indicated th..