Sulfate and sulfide reactions in the Mn-S-0 system

Abstract

A study has been made of the reaction equilibria in the manganese sulfate, sulfide, and oxide systems. By equilibrating manganese oxides (Mn3O4, Mn2O3) with SO2 + O2 + N2 gas mixtures, the dissociation pressures of MnSO4 have been evaluated. It was also found that there is some sulfate solid solution in manganese oxides. The equilibrium gas composition for the formation of manganese sulfide from manganous oxide was determined by reacting the oxide with H2-H2S-H2O mixtures. The manganese sulfide was found to be more stable than indicated by previous studies. It was also found that there is little or no solid solution of sulfide in manganous oxide. This is contrary to the previously reported observations. The chemistry of reactions involved in the production of mattes in a low-shaft blast furnace is discussed in the light of our recent studies of sulfate-sulfide reactions.