Cationic Effect of Ferrous Ions on Sulfide Capacity of CaO-FetO-Al2O3-SiO2 Slag System

Joon Sung Choi, Dong Joon Min

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Abstract

The cationic effect of ferrous ions on the sulfide capacity of CaO-FetO-Al2O3-SiO2 slags was studied from the viewpoint of the ionic structure in the slag using micro-Raman spectroscopy. In the cation-excess region (M2+/2(Fe3+ + Al3+) > 1.0), the sulfide capacity was directly proportional to the basicity of the slags, owing to the S2− stabilizing effect of excess cations. However, in the cation-deficient region (M2+/2(Fe3+ + Al3+) < 1.0), the sulfide capacity was independent of the basicity of the slags owing to the deficiency of cations required for charge compensation with Al3+ and Fe3+. The cation-substitution effect on the sulfide capacity of the CaO-rich slags (FetO/(FetO + CaO < 0.5) exhibited a linear relationship with the Fe2+ content because Fe2+ had a stronger affinity with S2− compared to that with Ca2+. However, in the FetO-rich slags (FetO/(FetO + CaO > 0.5), the sulfide capacity decreased with the increase of the Fe2+ content owing to the Qn unit affinity of the Fe2+ ion. The sulfide capacity was determined by the competition between the Qn unit affinity and stability of the S2− ion, depending on the type of cation. Therefore, the partial covalent bonding between the M2+ cations (M: Ca, Fe) and aluminosilicate affected the ionic interactions with the S2− ions.

Original languageEnglish
Pages (from-to)2758-2768
Number of pages11
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume50
Issue number6
DOIs
Publication statusPublished - 2019 Dec 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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