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Anionic effect of chloride, fluoride, and sulfide ions on the viscosity of slag melt
Author(s) -
Lee Sunghee,
Min Dong Joon
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14787
Subject(s) - depolymerization , viscosity , activation energy , silicate , slag (welding) , sulfide , chemistry , ionic bonding , fluoride , natural bond orbital , chloride , inorganic chemistry , raman spectroscopy , mineralogy , materials science , ion , metallurgy , organic chemistry , composite material , molecule , physics , optics
The effect of the addition of CaX (X=Cl 2 , F 2 and S) on the viscous behavior and structure of CaO–SiO 2 –Al 2 O 3 –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‐M 2+ ‐NBO linkage to form NBO‐M 2+ ‐F − , NBO‐M 2+ ‐Cl − , or M 2+ ‐S 2− . All these results are discussed in detail with the help of a viscous flow model based on the ionic interactions.