Density of the Blast Furnace Slag Bearing TiO₂ at 1673 K

Abstract

The density of blast furnace slag bearing TiO₂ has been investigated using the dispensed drop method at 1673 K under the Argon atmosphere (Pressure ≈1.2 atm). The influence of slag basicity and the TiO₂ content on the density was analyzed according to the measurements. It was found that the density of the slag increases with increasing the TiO₂ content from 0% to 23%, once the TiO₂ content exceed of 23%, the density decreases. The reason of this transition can be attributed to the reduce of the coordination numbers of Ti–O, Ca–O and Mg–O by means of the molecular dynamics simulation. For the influence of the increase of basicity from 0.9 to 1.2, the density slightly rises from 2.83 g/cm³ to 2.92 g/cm³. The empirical formulas for the density which relates TiO₂ content and basicity are developed. The prediction model for the density by the partial molar volume method was also discussed, indicating that the calculated values can reach a good quantitative agreement with the measured values without the apparent change of the coordination numbers of the cations with O.