Abstract
Hematite compacts were sintered at 973–1273 K for up to 2 h in air. The physical characteristics of green and sintered compacts (total porosity, pore surface area, pore size distribution and particle sizes) were measured and correlated with the sintering conditions. The surface structure of the compacts was examined with scanning electron microscopy. A mathematical model was proposed to correlate the variation of porosity with sintering parameters.Sintered compacts were isothermally reduced with H2 at 773–1273 K using a weight-loss technique. The mechanisms and kinetics of reduction were studied and correlated with the structure of the Fe2O3 compacts. Another model was derived to predict the apparent activation energy at the initial stages of the reduction of Fe2O3 compacts having a certain pore surface area.
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