Gaseous reduction of Fe2O3 compacts at 600 to 1050° C |
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Authors: | A A El-Geassy |
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Affiliation: | (1) National Research Centre, Central Metallurgical Research and Development Institute (CMRDI), Cairo, Egypt |
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Abstract: | Dense Fe2O3 briquettes were isothermally reduced with hydrogen, carbon monoxide and H2-CO mixtures at 600 to 1050‡ C. The course of reduction was followed by measuring the oxygen weight loss, as a function of
time, using a thermogravimetric technique. Microscopic examination, X-ray and carbon analyses were also used to elucidate
the kinetics and mechanisms of reduction of Fe2O3 briquettes. In the initial stages of reduction, the highest reduction rate was obtained in hydrogen while the slowest was
in carbon monoxide. In CO-H2 gas mixtures, the rate decreased with increasing amounts of carbon monoxide. In the later stages of reduction, a minimum
reduction rate was only observed during the reduction with hydrogen and hydrogen-rich gas mixtures due to the formation of
denseγ-iron at 900 to 950‡ C. This was eliminated in carbon monoxide and carbon-monoxide-rich gas mixtures due to the carbon deposition
in the samples and secondary reactions. |
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