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

Abstract

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 1 200 to 1 500 degrees 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 1 200 degrees C and 1 250 degrees 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.