A study on the effect of Na2O on the viscosity for ironmaking slags

H. Kim; W. H. Kim; J. H. Park; D. J. Min

doi:10.1002/srin.200900118

A study on the effect of Na₂O on the viscosity for ironmaking slags

H. Kim, W. H. Kim, J. H. Park, D. J. Min

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

62 Citations (Scopus)

Abstract

The viscosities of CaO-SiO₂-10wt%MgO-20wt%Al₂O ₃-Na₂O slags (CaO/SiO₂=0.8-1.2, wt%Na ₂O=0-10) were measured to estimate the effect of Na₂O on the viscous behavior at elevated temperatures. The slag viscosity at 1773K decreased with increasing Na₂Ocontents, which is observed in a basic oxide component. However, the FT-IR spectroscopic analysis of the slag structure seemed to verify that [AlO₄]-tetrahedra depolymerized more readily than [SiO₄]-tetrahedra due to ionic charge compensation which has a tendency to be more effective on [AlO₄]-tetrahedra. Hence, for the present slag system, the viscosity decreased with additions of Na₂O by providing network breaking O_2- ions, and the charge balance by Na⁺ ions independently contributed to the depolymerization of the network structure of the molten slag. In addition, Na₂O also lowered the critical temperature (T_CR) resulting in a larger temperature difference between the operating temperature (T_OP) and T _CR, which can enhance operational stability.

Original language	English
Pages (from-to)	17-24
Number of pages	8
Journal	Steel Research International
Volume	81
Issue number	1
DOIs	https://doi.org/10.1002/srin.200900118
Publication status	Published - 2010 Jan

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Physical and Theoretical Chemistry
Metals and Alloys
Materials Chemistry

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10.1002/srin.200900118

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title = "A study on the effect of Na2O on the viscosity for ironmaking slags",

abstract = "The viscosities of CaO-SiO2-10wt%MgO-20wt%Al2O 3-Na2O slags (CaO/SiO2=0.8-1.2, wt%Na 2O=0-10) were measured to estimate the effect of Na2O on the viscous behavior at elevated temperatures. The slag viscosity at 1773K decreased with increasing Na2Ocontents, which is observed in a basic oxide component. However, the FT-IR spectroscopic analysis of the slag structure seemed to verify that [AlO4]-tetrahedra depolymerized more readily than [SiO4]-tetrahedra due to ionic charge compensation which has a tendency to be more effective on [AlO4]-tetrahedra. Hence, for the present slag system, the viscosity decreased with additions of Na2O by providing network breaking O2- ions, and the charge balance by Na+ ions independently contributed to the depolymerization of the network structure of the molten slag. In addition, Na2O also lowered the critical temperature (TCR) resulting in a larger temperature difference between the operating temperature (TOP) and T CR, which can enhance operational stability.",

author = "H. Kim and Kim, {W. H.} and Park, {J. H.} and Min, {D. J.}",

year = "2010",

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doi = "10.1002/srin.200900118",

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volume = "81",

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AU - Kim, H.

AU - Kim, W. H.

AU - Park, J. H.

AU - Min, D. J.

PY - 2010/1

Y1 - 2010/1

N2 - The viscosities of CaO-SiO2-10wt%MgO-20wt%Al2O 3-Na2O slags (CaO/SiO2=0.8-1.2, wt%Na 2O=0-10) were measured to estimate the effect of Na2O on the viscous behavior at elevated temperatures. The slag viscosity at 1773K decreased with increasing Na2Ocontents, which is observed in a basic oxide component. However, the FT-IR spectroscopic analysis of the slag structure seemed to verify that [AlO4]-tetrahedra depolymerized more readily than [SiO4]-tetrahedra due to ionic charge compensation which has a tendency to be more effective on [AlO4]-tetrahedra. Hence, for the present slag system, the viscosity decreased with additions of Na2O by providing network breaking O2- ions, and the charge balance by Na+ ions independently contributed to the depolymerization of the network structure of the molten slag. In addition, Na2O also lowered the critical temperature (TCR) resulting in a larger temperature difference between the operating temperature (TOP) and T CR, which can enhance operational stability.

AB - The viscosities of CaO-SiO2-10wt%MgO-20wt%Al2O 3-Na2O slags (CaO/SiO2=0.8-1.2, wt%Na 2O=0-10) were measured to estimate the effect of Na2O on the viscous behavior at elevated temperatures. The slag viscosity at 1773K decreased with increasing Na2Ocontents, which is observed in a basic oxide component. However, the FT-IR spectroscopic analysis of the slag structure seemed to verify that [AlO4]-tetrahedra depolymerized more readily than [SiO4]-tetrahedra due to ionic charge compensation which has a tendency to be more effective on [AlO4]-tetrahedra. Hence, for the present slag system, the viscosity decreased with additions of Na2O by providing network breaking O2- ions, and the charge balance by Na+ ions independently contributed to the depolymerization of the network structure of the molten slag. In addition, Na2O also lowered the critical temperature (TCR) resulting in a larger temperature difference between the operating temperature (TOP) and T CR, which can enhance operational stability.

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