Experimental Study of Sulfur Solubility in Silicate Melts Coexisting with Graphite as a Function of Silicate Melt Composition

摘要

Sulfur (S) solubility is determined in silicate melts, in particular with low-FeO content coexisting with graphite. In a high FeO range (>10 mol percent), the S solubility is strongly dependent on the FeO content in silicate melt, which is in good agreement with previous works. In an intermediate FeO range (1 approx 10 mol percent), the S solubility in melts with a multi-component system is higher than that in melts with a simple system. The SK alpha shift of the electron microprobe shows the dissolve sulfur is all sulfide. A positive dependence is observed between CaO and S content in the melt undoped with FeO, but the dissolved sulfur is sulfate. The relationship between melt composition, S content, and S oxidation state is discussed.