A Study on the Effect of Na2O on the Viscosity for Ironmaking Slags
- Authors
- Kim, H.; Kim, W. H.; Park, J. H.; Min, D. J.
- Issue Date
- Jan-2010
- Publisher
- Verlag Stahleisen GmbH
- Keywords
- viscosity; Na2O; FT-IR; ion compensation; high Al2O3 slags; critical temperature
- Citation
- Steel Research International, v.81, no.1, pp.17 - 24
- Indexed
- SCIE
SCOPUS
- Journal Title
- Steel Research International
- Volume
- 81
- Number
- 1
- Start Page
- 17
- End Page
- 24
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/40056
- DOI
- 10.1002/srin.200900118
- ISSN
- 1611-3683
- Abstract
- The viscosities of CaO-SiO2-10wt%MgO-20wt%Al2O3-Na2O slags (CaO/SiO2 = 0.8-1.2, wt%Na2O = 0-10) were measured to estimate the effect of Na2O on the viscous behavior at elevated temperatures. The slag viscosity at 1773 K decreased with increasing Na2O contents, 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 (T-CR) resulting in a larger temperature difference between the operating temperature (T-OP) and T-CR, which can enhance operational stability
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