Experimental and Theoretical Studies on the Viscosity–Structure Correlation for High Alumina-Silicate Melts

Blast furnaces are encountering high Alumina (Al 2 O 3 > 25 pct) in the final slag due to the charging of low-grade ores. To study the viscosity behavior of such high alumina slags, synthetic slags are prepared in the laboratory scale by maintaining a chemical composition of Al 2 O 3 (25 to 30 wt...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2017-06, Vol.48 (3), p.1450-1462
Main Authors: Talapaneni, Trinath, Yedla, Natraj, Pal, Snehanshu, Sarkar, Smarajit
Format: Article
Language:English
Subjects:
Activation energy
Aluminum oxide
Characterization and Evaluation of Materials
Chemistry and Materials Science
Fourier transforms
Infrared spectroscopy
Liquidus
Magnesium oxide
Materials Science
Metallic Materials
Nanotechnology
Slags
Structural Materials
Surfaces and Interfaces
Thin Films
Viscosity
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Summary:Blast furnaces are encountering high Alumina (Al 2 O 3 > 25 pct) in the final slag due to the charging of low-grade ores. To study the viscosity behavior of such high alumina slags, synthetic slags are prepared in the laboratory scale by maintaining a chemical composition of Al 2 O 3 (25 to 30 wt pct) CaO/SiO 2 ratio (0.8 to 1.6) and MgO (8 to 16 wt pct). A chemical thermodynamic software FactSage 7.0 is used to predict liquidus temperature and viscosity of the above slags. Experimental viscosity measurements are performed above the liquidus temperature in the range of 1748 K to 1848 K (1475 °C to 1575 °C). The viscosity values obtained from FactSage closely fit with the experimental values. The viscosity and the slag structure properties are intent by Fourier Transform Infrared (FTIR) and Raman spectroscopy. It is observed that increase in CaO/SiO 2 ratio and MgO content in the slag depolymerizes the silicate structure. This leads to decrease in viscosity and activation energy (167 to 149 kJ/mol) of the slag. Also, an addition of Al 2 O 3 content increases the viscosity of slag by polymerization of alumino-silicate structure and activation energy from 154 to 161 kJ/mol. It is witnessed that the activation energy values obtained from experiment closely fit with the Shankar model based on Arrhenius equation.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-017-0963-3