The modeling of hematite reduction with hydrogen plus carbon monoxide mixtures: Part I. The behavior of single pellets

Abstract On the assumption of shrinking core behavior, a mathematical model was developed for representing the reduction of hematite disks with a mixture of hydrogen and carbon monoxide. In the model, experimentally measured values were used for the porosity, and the effective pore diffusivities were calculated from pseudo binary formulas. Literature data were used for the activation energies of the reactions, while the preexponential factors were obtained by data fitting. The model was found to provide a good means for representing experimental measurements of Szekely and El‐Tawil (1976), both with regards to the effect of temperature and gas composition.