Laboratory study of phase transitions and mechanism of reduction of FeO from high Ti-bearing blast furnace primary slag by graphite

Abstract

The reduction of FeO from iron-saturated FeO–CaO–SiO₂–MgO–Al₂O₃–TiO₂ slags by graphite has been studied under static conditions between 1473 and 1623 K. The results show that the Fe/Ti mole ratio in the sample matrix decreases with increasing time and temperature. Most of the FeO was reduced within the first 10 min at 1573 K. The degree of reduction was found to increase rapidly with increasing temperature below 1573 K and was controlled not only by the effective diffusivity of CO and FeO concentration, but also the formation of iron-titanium oxide in the sample. At the same time and temperature, the degree of reduction of FeO in Ti-bearing slag was higher than that of Ti-free slag, because TiO₂ can decrease the liquidus temperature and prompt reduction of the slag.

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