Phase relations in the zinc-iron-sulfur ternary system at 1100 and 1200 K were determined through electron probe X-ray microanalysis and X-ray diffraction studies. It was found that the phase relations in this system consist of two-condensed-phase fields and three-condensed-phase fields. Further, evidence indicate that sulfur solubility in metal coexisting with sulfide is negligibly small, while the sulfur content in sulfide coexisting with metal is less than 50 mol%. FeS solubility in ZnS was considerably larger than that of ZnS in FeS.
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