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

The phosphorus partition (L P ) and phosphate capacity ( C PO 43 − ) were measured for TiO 2 bearing basic oxygen steelmaking slags in the CaO–SiO 2 –MgO–Fe t O–(TiO 2 –MnO–Al 2 O 3 –P 2 O 5 ) system at 1 650 ° C. The effect of slag and metal additions were tested by varying the TiO 2 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 TiO 2 concentration of the slag was found to decrease the L P and C PO 43 − of basic oxygen steelmaking (BOS) slags. Capacity values in the range of 2.2 × 10 16 to 1.5 × 10 18 at 1 650 ° C were obtained. An empirical model for determining C PO 43 − was developed for BOS slags using a large dataset of published slag and pO 2 data for relevant slag systems, including published data for titania bearing slags. The predicted C PO 43 − from the empirical model was found to agree with the experimentally determined C PO 43 − data from this study.