Abstract
The distribution equilibria of oxygen, phosphorus and sulphur between 1-10mol%FetO containing CaO-SiO2-Al2O3-MgO slag saturated with 2CaO·SiO2 and liquid iron were observed at steelmaking temperature in the present work to consider the distribution of each element in steady state between the slag and iron - carbon melt in bath smelting process.
It was assumed that the oxygen potential at slag-metal interface was not controlled by the activity of oxygen in metal phase but almost done by the iron oxide activity in slag phase and the activities of phosphorus and sulphur in ironcarbon melt were equal to those in liquid iron equilibrated with the present slag. On this assumption, the distribution ratios of phosphorus and sulphur between the slag and iron - carbon melt were estimated at ironmaking temperature as a function of slag composition, carbon content in metal and temperature based on the experimental results.
It was shown that the application of regular solution model to the slag could predict the distribution ratios of phosphorus and sulphur in bath smelting process at any slag composition, carbon content in metal and temperature on the above-mentioned assumption.
