Sulfide Capacity and Excess Free Energy of CaO-SiO2-MnO Slag Derived from Structural Analysis of Raman Spectra

Abstract

A study was conducted to evaluate the thermochemical properties such as sulfide capacity and excess free energy of mixing of oxide components as important properties in metallurgical slags important properties in metallurgical slags along with a degree of polymerization of silicate melts. The capability of molten slags absorbing sulfide ions was quantified as the sulfide capacity. It was demonstrated that the partial molar excess free energy was important in view of phase equilibria, mixing phenomena, and any other thermochemical properties of molten silicates. The activity coefficients of oxide components CaO, MnO and SiO2 commercial thermochemical computing software, FactSage™6.2 with 'FToxid' database, which was successfully applied in computation of thermochemical properties of multicomponent oxide melts. It was observed that the activity calculation in the existing CaO-SiO2-MnO system was in good consistency with other thermochemical properties, such as carbide capacity and sulfide capacity.