Phosphorus Distribution between Soda- and Lime-based Fluxes and Carbon-saturated Iron Melts

Abstract

The phosphorus distribution ratios between carbon-saturated iron melts and Na₂O-SiO₂, Na₂O-SiO₂-MO (M=Mg, Ca, Ba), CaF₂-CaO or CaF₂-CaO-Al₂O₃ slags have been obtained as a function of slag compositions and temperatures. The phosphorus distribution ratios in the Na₂O-SiO₂-MO (M=Ca, Ba, Mg) system were found to decrease when Na₂O was replaced by MgO, CaO and BaO at a constant SiO₂ content. The temperature dependence of phosphorus distribution ratios in the CaF₂-CaO and CaF₂-CaO-Al₂O₃ systems has been observed in the temperature range of 1 430°C to 1 550°C, while in the Na₂O-SiO₂ system it has not been observed at 1 250°C and 1 350°C. The phosphorus distribution ratios in the MF₂-MO (M=Mg, Ca, Ba, Na) system were found to decrease in the order of Na>Ba>Ca>Mg.