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Abstract
Gaseous sulfur monoxide (SO) is experimentally found to be a primary intermediate product in the oxidation of nonferrous metal and iron monosulfides. This finding is used to develop a theory for the chain oxidation of metal sulfides to form oxysulfide complexes MSO x and gaseous SO. The main steps of the metal sulfide oxidation via a chain mechanism are thermodynamically characterized. The Gibbs energies of the oxidation reactions are shown to decrease in the absolute value relative to the type of sulfide as follows: FeS, Ni3S2, CoS, NiS, ZnS, PbS, CdS, CuS, and Cu2S. The thermodynamic probability of all steps of the chain oxidation of the monosulfides with the evolution of gaseous atomic oxygen and sulfur is estimated.
Published Version
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