Abstract
In an iron-making blast furnace, wustite is usually doped with relatively low concentration levels of CaO, SiO2, and A12O3. The effect of the interaction between CaO and SiO2 dissolved in wustite on the reduction was investigated in concentration levels as low as 0.05 mol pct. The double addition of SiO2 to CaO-bearing wustite has been found to intensify its reducibility greatly, improving the effect of the single addition of CaO. The double addition also greatly intensifies the segregation of Ca ion at the surface of wustite, causing the wustite lattice to contract due to the interaction of CaO with SiO2. Ultimately, the improvement in the reducibility of wustite is attributable to the intensified surface segregation of Ca ion, which facilitates the formation of a porous type of reduced iron. An additional conclusion is that CaO and SiO2, even at low concentration levels below the detection limit of electron probe microanalysis, can give the decisive effect to the reduction of wustite.
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