Abstract
Green compacts of hematite (54% porosity) were sintered in air at 1000°C for 30min and at 1300°C for 180min to produce porous (35% porosity) and dense (8% porosity) compacts, respectively. Hematite compacts were isothermally reduced with hydrogen at 500-1100°C using weight-loss technique as a function of time. The structural changes accompanying sintering and reduction processes were examined with mercury pressure porosimeter and optical and scanning electron microscopes. The reduction of porous and dense samples reveals the presence of reduction rate minimum at 650°C which was attributed to sintering and densification of the freshly reduced iron around the oxide grains. The retardation in the rate at 650°C was increased with the increase in the reduction extents and with decrease in the porosity of the compacts. The computed values of activation energy were correlated with the corresponding reduction mechanisms.
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