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

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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.