Phosphorus Partition and Phosphate Capacity of TiO₂ Bearing Basic Oxygen Steelmaking Slags

Abstract

The phosphorus partition (L_P) and phosphate capacity () were measured for TiO₂ bearing basic oxygen steelmaking slags in the CaO–SiO₂–MgO–Fe_tO–(TiO₂–MnO–Al₂O₃–P₂O₅) system at 1650°C. The effect of slag and metal additions were tested by varying the TiO₂ content from 0.0 to 18.0 mass% and the [Ti] content from 0.009 to 0.301 mass%. A recently published L_P model was used to assess the experimental L_P data using the measured slag composition and temperature. Experimental L_P data from this study and literature data were used to modify the published model to include titania.

Increasing the TiO₂ concentration of the slag was found to decrease the L_P and of basic oxygen steelmaking (BOS) slags. Capacity values in the range of 2.2×10¹⁶ to 1.5×10¹⁸ at 1650°C were obtained. An empirical model for determining was developed for BOS slags using a large dataset of published slag and pO₂ data for relevant slag systems, including published data for titania bearing slags. The predicted from the empirical model was found to agree with the experimentally determined data from this study.