Phosphorus Partition Between Liquid Crude Steel and High-Basicity Basic Oxygen Furnace Slags

The phosphorus partition between the unkilled liquid crude steel and the high basicity (CaO/SiO2 = 4.2), basic oxygen furnace (BOF) slags with varying compositions of Al2O3, TiO2, and MnO is studied at temperatures 1600 and 1650 degrees C. The tests are conducted in both slag-to-metal and metal-to-slag directions and for durations of 30 and 60 min. The measured results are compared with the values reported in literature and found to be in good agreement with some of them. It is found in the investigation of high-basicity BOF slags, that Al2O3, MnO, and TiO2 lower the phosphorus partition. The phosphorus partition increases with increasing optical basicity. The phosphorus partition shows a maximum when the FeO content is in range of 25-30 mass%. The MgO content slightly increases the phosphorus partition.

Automated summary

In studying the phosphorus partition between unkilled liquid crude steel and high basicity BOF slags, it was found that Al2O3, MnO, and TiO2 decrease phosphorus partition while increasing optical basicity and a FeO content of 25-30 mass% lead to a maximum phosphorus partition. Additionally, MgO content slightly increases phosphorus partition.