Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt

Sunghee Lee, Dong Joon Min

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of the addition of CaX (X=Cl2, F2 and S) on the viscous behavior and structure of CaO–SiO2–Al2O3–MgO–CaX slag was investigated by measuring its viscosity. The viscosity of the slag without CaX gradually decreased with an increase in the C/S ratio because of the depolymerization of the silicate groups in the slag. While the viscosity of the CaX-bearing slag decreased with an increase in the CaX content, depolymerization was not observed in this case. Three distinct compositional regions for the activation energy of the viscous flow were observed because of the effect of the equilibrium of the polymeric silicate groups. The relaxation effect of the CaX groups on the activation energy was also observed. Raman spectroscopic analysis indicated that the relaxation in the viscosity and activation energy by CaX addition stemmed from the breaking of the NBO-M2+-NBO linkage to form NBO-M2+-F, NBO-M2+-Cl, or M2+-S2−. All these results are discussed in detail with the help of a viscous flow model based on the ionic interactions.

Original languageEnglish
Pages (from-to)2543-2552
Number of pages10
JournalJournal of the American Ceramic Society
Volume100
Issue number6
DOIs
Publication statusPublished - 2017 Jun 1

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Sulfides
slag
Fluorides
fluoride
Slags
Chlorides
viscosity
chloride
sulfide
melt
activation energy
Viscosity
Ions
Silicates
Depolymerization
viscous flow
ion
Activation energy
Viscous flow
Bearings (structural)

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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title = "Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt",
abstract = "The effect of the addition of CaX (X=Cl2, F2 and S) on the viscous behavior and structure of CaO–SiO2–Al2O3–MgO–CaX slag was investigated by measuring its viscosity. The viscosity of the slag without CaX gradually decreased with an increase in the C/S ratio because of the depolymerization of the silicate groups in the slag. While the viscosity of the CaX-bearing slag decreased with an increase in the CaX content, depolymerization was not observed in this case. Three distinct compositional regions for the activation energy of the viscous flow were observed because of the effect of the equilibrium of the polymeric silicate groups. The relaxation effect of the CaX groups on the activation energy was also observed. Raman spectroscopic analysis indicated that the relaxation in the viscosity and activation energy by CaX addition stemmed from the breaking of the NBO-M2+-NBO linkage to form NBO-M2+-F−, NBO-M2+-Cl−, or M2+-S2−. All these results are discussed in detail with the help of a viscous flow model based on the ionic interactions.",
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Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt. / Lee, Sunghee; Min, Dong Joon.

In: Journal of the American Ceramic Society, Vol. 100, No. 6, 01.06.2017, p. 2543-2552.

Research output: Contribution to journalArticle

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