Sulphide Capacity and Sulphur Solubility in CaO-Al2O3 and CaO-Al2O3-CaF2 Slags

Shiro Ban-Ya; Makoto Hobo; Tetsuro Kaji; Takeshi Itoh; Mitsutaka Hino

doi:10.2355/isijinternational.44.1810

Sulphide Capacity and Sulphur Solubility in CaO-Al₂O₃ and CaO-Al₂O₃-CaF₂ Slags

Shiro Ban-Ya, Makoto Hobo, Tetsuro Kaji, Takeshi Itoh, Mitsutaka Hino

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Keywords: sulphide capacity, sulphur solubility limit, CaO-Al₂O₃ slag, CaO-Al₂O₃-CaF₂ slag, slag basicity, thermodynamics, Henry's law

JOURNAL FREE ACCESS

2004 Volume 44 Issue 11 Pages 1810-1816

DOI https://doi.org/10.2355/isijinternational.44.1810

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Abstract

The sulphide capacity and the solubility limit of CaS in CaO-Al₂O₃ and CaO-Al₂O₃-CaF₂ slags have been studied at the temperatures from 1823 to 1923 K by the equilibrium measurement of gas-slag reaction. The sulphide capacity and the solubility of CaS in these two slag systems increase with increasing CaO content and decreasing ratio of NAl₂O₃/NCaF₂. The sulphur in CaO-Al₂O₃-CaF₂ slag negatively deviated from Henry's law in the high concentration range of sulphur in slag, and the activity coefficient of sulphur in slag varies with sulphur content, slag composition and temperature. It was confirmed that the sulphide capacity was unable to be applied as a real measure of the slag basicity theoretically.

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