A thermodynamic model for calculation of sulfur distribution ratio between CaO- SiO2- Al2O3- Na2O- TiO2- (MgO) slags and carbon saturated hot metal

The ion and molecule coexistence theory (IMCT) indicates that the mass action concentrations of structural units or ion couples in slags can represent the chemical reaction ability as the traditional slags activity.By establishing the mass action concentrations equations of structural units or ion couples in the CaO- SiO2- Al2O3- Na2O- TiO2- (MgO) slags, the mass action concentrations were solved by Matlab, so as to build a thermodynamic model for calculating the sulfur distribution ratio between slags and carbon saturated hot metal under 1450??.The calculated sulfur distribution ratio of model agrees well with the experimental sulfur distribution ratio, which can help to predict the sulfur distribution ratio between slags and carbon saturated hot metal.The thermodynamic model can quantitatively determine the respective sulfur distribution ratio of CaO, Na2O and total sulfur distribution ratio in slags.Through the calculated results, the influencing factors on total sulfur distribution ratio were analyzed. In addition, the model can quantitatively calculate the contribution of CaO and Na2O on total sulfur distribution ratio, and qualitatively describe their trend affected by other factors.