Experimental Investigations of Phase Equilibria of MnS Containing Sub-systems in the MnO–SiO2–Al2O3–MnS System

Phase equilibria of the MnO–MnS, MnO–SiO2–MnS, and MnO–Al2O3–MnS systems under low oxygen partial pressure have been experimentally investigated for the temperature range of 1200 to 1500°C using equilibration and quenching techniques. Equilibrium phases were analyzed by Scanning Electron Microscope, Electron Probe X-ray Microanalysis (EPMA), and Differential Thermal Analysis (DTA). Phase diagrams were successfully constructed for the systems investigated. A ternary compound in the MnO–SiO2–MnS system was observed at 1200°C and 1250°C. No ternary compound or solid solution was observed in the MnO–Al2O3–MnS system. The results of the present study were critically compared with the results reported previously.