Thermodynamic study on phase equilibria in the liquid Fe-S-O system

Young Seok Lee, Sung Mo Jung, Dong Joon Min

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The phase equilibria and thermodynamic properties of the Fe-S-O melt at 1273 - 1573 K were investigated by employing thermochemical equilibration technique. The γ-Fe+liquid region was extended to higher sulphur content region than that of literature. The solubility of FeS in slags decreased with increasing the activity of FeO and the solubility slightly decreased with increasing temperature. The activity of FeO exhibited a negative deviation from ideality in the composition with a molar mass fraction of less than about 60 % FeO, while a positive deviation was observed at XFeO ≥ 0.6. However, the activity of FeS exhibited a positive deviation from ideality at 1273 K, and a nearly ideal behaviour at 1573 K, respectively. The enthalpy changes of mixing were calculated to be some positive value. The sulfur content in reduced solid iron decreased from about 110 to 70 ppm at 1273 K as the ratio FeO/FeS in slag increased up to the composition doubly saturated by Fe/FeO, while the sulfur content decreased from about 400 to 150 ppm at 1573 K. The oxygen content in reduced solid iron increased to about 3 ppm at 1273 K with increasing FeO/FeS ratio up to the composition saturated by FeO.

Original languageEnglish
Pages (from-to)461-466
Number of pages6
JournalSteel Research
Volume73
Issue number11
DOIs
Publication statusPublished - 2002 Jan 1

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Sulfur
Phase equilibria
Thermodynamics
thermodynamics
Slags
sulfur
slags
Liquids
Iron
liquids
Solubility
Chemical analysis
deviation
solubility
Molar mass
iron
Enthalpy
Thermodynamic properties
Oxygen
thermodynamic properties

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

Cite this

Lee, Young Seok ; Jung, Sung Mo ; Min, Dong Joon. / Thermodynamic study on phase equilibria in the liquid Fe-S-O system. In: Steel Research. 2002 ; Vol. 73, No. 11. pp. 461-466.
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Thermodynamic study on phase equilibria in the liquid Fe-S-O system. / Lee, Young Seok; Jung, Sung Mo; Min, Dong Joon.

In: Steel Research, Vol. 73, No. 11, 01.01.2002, p. 461-466.

Research output: Contribution to journalArticle

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