Phosphorus Distribution between Liquid Iron and MgO Saturated Slags of the System CaO-MgO-FeOx-SiO2

Experiments have been made to study the phosphorus distribution between liquid iron and the CaO-MgO-FeOx-SiO2 slag equilibrated in a magnesia crucible in the temperature range 1 550-1 650°C. The phosphorus distribution ratio (P2O5)/[P] increased with increasing CaO content and decreasing temperature. The maximum values of the distribution ratio were found to be present near the slag composition saturated with the tricalcium silicate and the magnesio wustite phases. The experimentally determined phosphorus content in metal disagreed with the phosphorus content estimated from the treatments proposed by Balajiva et al., Turkdogan and Pearson, and Healy over the present range of slag compositions, except by Flood and Grjotheim.