Although the quality of raw materials such as scrap, iron ore, coke and coal is degrading, the demand for high quality end products is rising. Hence, the need of the hour is to efficiently process highly impure raw materials to manufacture final products with low impurities. Except for a few steel grades (for e.g., ball bearing steel where the sulphide precipitates aid the cutting operation), sulphur is considered to be a major impurity as it increases brittleness and decreases weldability and corrosion resistance of steel[1]. In particular, sulphide capacity, which is a measure of the sulphur removing power of the slag, is an important metric which should be optimized. Often it has been noticed that the partition of sulphur between steel and slag in industry is quite different that that predicted by previously developed models.