1987 Volume 73 Issue 16 Pages 2243-2250
The dense wustite plates containing Al2O3 or Al2O3-CaO have been reduced isothermally in H2 gas in the temperature range from 670 to 930°C. In the case that 0.5%Al2O3 are added, all of the added Al2O3 are dissolved in FeO phase. This dissolved Al2O3 promotes the formation of dense iron covering the FeO surface and slows down the reduction rate of FeO phase. In the case that Al2O3 are added above 1%, hercynite precipitates in the samples and accelerates the reduction of FeO phase. The rate of the reduction of the samples containing 5%Al2O3 are slightly larger at the temperatures above 890°C and smaller at the temperatures up to 800°C than that of the pure FeO.
The rate of the reduction of the samples containing Al2O3 and CaO increases with increase in the concentration of the dissolved CaO because the effect of the dissolved CaO that promotes the formation of porous iron layer becomes larger than that the above mentioned effect of the dissolved Al2O3.
