Sulfide capacity of CaO-SiO2-FeO-Al2O3-MgOsatd.

Youngjoo Park, Dong Joon Min

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The sulfide capacities of CaO-SiO2-FeO-Al2O3-MgOsatd. slag were measured at 1 823 K over a wide range of compositions using the thermochemical equilibrating technique. The experimental results indicated that MgO had a marginal effect on desulfurization because of its low thermodynamic driving force for sulfur ion stabilization in slag, whereas Al2O3 decreases the sulfide capacity because of its acidic behavior in the present slag system. The effect of FeO on desulfurization can be changed by the slag basicity because the Fe2+ cation competes with the Ca and Mg cations, which is reflected in changes in the sulfide stability of FeS in the slag. The depletion of Ca2+ cations in an acidic slag electrically bound Ca2+ ions with near non-bridging oxygen to create electric neutrality because of its higher ionicity. Thus, the competitive affinity of Fe, Ca, and Mg with sulfur in the slag plays an important role in the effect of the basicity of the slag on the stability of sulfide in a moderate slag composition range. Nonetheless, S2 - ions form CaS instead of FeS in a basic slag because there are excess free Ca2+ ions.

Original languageEnglish
Pages (from-to)520-526
Number of pages7
JournalISIJ International
Volume56
Issue number4
DOIs
Publication statusPublished - 2016 Jan 1

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Sulfides
Slags
Ions
Cations
Positive ions
Alkalinity
Desulfurization
Sulfur
Chemical analysis
Stabilization
Thermodynamics
Oxygen

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Park, Youngjoo ; Min, Dong Joon. / Sulfide capacity of CaO-SiO2-FeO-Al2O3-MgOsatd. In: ISIJ International. 2016 ; Vol. 56, No. 4. pp. 520-526.
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Sulfide capacity of CaO-SiO2-FeO-Al2O3-MgOsatd.. / Park, Youngjoo; Min, Dong Joon.

In: ISIJ International, Vol. 56, No. 4, 01.01.2016, p. 520-526.

Research output: Contribution to journalArticle

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