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

Sunghee Lee, Dong Joon Min

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


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
Issue number6
Publication statusPublished - 2017 Jun 1

Bibliographical note

Publisher Copyright:
© 2017 The American Ceramic Society

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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