Thermodynamic study of MnO-SiO2-Al2O3 slag system: Liquidus lines and activities of MnO at 1823 K
| Autor: | Hae-Geon Lee, Dae-Hee Woo, Youn-Bae Kang |
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| Rok vydání: | 2002 |
| Předmět: |
Activity coefficient
Alloy Metals and Alloys Analytical chemistry Mineralogy Liquidus engineering.material Condensed Matter Physics Mole fraction Cristobalite chemistry.chemical_compound chemistry Mechanics of Materials Materials Chemistry Aluminium oxide engineering Saturation (chemistry) Phase diagram |
| Zdroj: | Metallurgical and Materials Transactions B. 33:915-920 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-002-0075-5 |
| Popis: | The liquid MnO-SiO2-Al2O3 system was studied at 1823 K by equilibrating MnO-SiO2-Al2O3 melts of different compositions with Pt-Mn alloys and an oxygen-bearing gas phase. Liquid compositions for cristobalite saturation were determined at 1823 K. A new liquidus for the cristobalite primary field is proposed. The activity of Mn in the Pt-Mn alloy at 1823 K can be represented by the following equation: $$\ln \gamma _{Mn} = - 9.285(1 - X_{Mn} )^2 - 2.0791$$ The MnO activity was measured in different melt compositions, and MnO isoactivity lines were determined. It was found that the MnO activity is relatively insensitive to the SiO2/Al2O3 ratio, but increases sharply above the MnO mole fraction of 0.5. In the low-MnO-concentration range (α MnO |
| Databáze: | OpenAIRE |
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