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In a previous article,1) the structure of molten CaO–SiO2– MnO slag was systematically analyzed using micro-Raman spectroscopic data obtained from a melt-quenched glass samples. Various thermophysical properties such as viscosity, density (molar volume), and electrical conductivity (resistivity) of the CaO–SiO2–MnO slag was strongly dependent of a degree of polymerization defined as Q3/Q2 ratio. Furthermore, the speciation of free oxygen, bridging oxygen and non-bridging oxygen was also quantitatively derived from a novel approach based on a mass balance of oxygen and silicon atoms in discrete silicate anionic units, viz. Qn (n = 0, 1, 2, and 3). In the present note, the thermochemical properties such as sulfide capacity and excess free energy of mixing of oxide components which are important properties in metallurgical slags are evaluated using a concentration of free oxygen as well as a degree of polymerization of silicate melts, i.e. Q3/Q2 ratio. The capability of molten slags absorbing sulfide ions is quantified as the sulfide capacity ( ) which is given in Eq. (2) deduced from Eq. (1).2,3) Here, Eq. (1) indicates the gas-slag equilibrium reaction for sulfur dissolution into the slag phase with a reference state of sulfur and oxygen to gaseous state.

Sulfide Capacity and Excess Free Energy of CaO^|^ndash;SiO2^|^ndash;MnO Slag Derived from Structural Analysis of Raman Spectra