A Structural Study on the Foaming Behavior of CaO-SiO{sub 2}-MO (MO = MgO, FeO, or Al{sub 2}O{sub 3}) Ternary Slag System

Journal Article · Fri Dec 15 04:00:00 EST 2017 · Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-017-1079-5· OSTI ID:22856083

Park, Youngjoo

The foaming index of the CaO-SiO{sub 2}-MO (MO = MgO, FeO, or Al{sub 2}O{sub 3}) ternary slag system with a fixed CaO/SiO{sub 2} ratio is measured to understand the effect of the ionic structure. At 1773 K (1500 °C), the foaming index of the slag increases with Al{sub 2}O{sub 3} addition and decreases with MgO or FeO addition at a fixed CaO/SiO{sub 2} ratio. It is verified that the previous correlation between the foaming index and the physical properties could also be valid for the CaO-SiO{sub 2}-(MgO or Al{sub 2}O{sub 3}) system. Raman spectroscopy for the CaO/SiO{sub 2} = 1.0 slag is applied to explain the foaming behavior from an ionic structural perspective. From the ionic structural viewpoint, the fractional change in each silicate anion unit is identified by de-convoluted Raman spectra. The Raman spectra indicate that the silicate network structure is polymerized with Al{sub 2}O{sub 3} as an aluminosilicate structure; in contrast, de-polymerization occurs by MgO or FeO addition. Furthermore, the relationship between the silicate structure and the thermodynamic stability function is discussed. Since the ionic structure of the molten slag affects various physical/thermodynamic properties, the foaming behavior could be successfully interpreted from the ionic structural viewpoint.

• OSTI ID: 22856083
• Journal Information: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B, Process Metallurgy and Materials Processing Science Journal Issue: 6 Vol. 48; ISSN 1073-5615; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
ANIONS
CALCIUM OXIDES
FOAMS
IRON OXIDES
MAGNESIUM OXIDES
POLYMERIZATION
RAMAN SPECTRA
RAMAN SPECTROSCOPY
SILICATES
SILICON OXIDES
SLAGS
THERMODYNAMIC PROPERTIES