Thermodynamics of MnO-SiO2-Al2O3-MnS Liquid Oxysulfide: Experimental and Thermodynamic Modeling
| Autor: | Dae-Hee Woo, Hae-Geon Lee, Ye-Jin Kim, Youn-Bae Kang, Henri Gaye |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Activity coefficient Controlled atmosphere Sulfide Chemistry Alloy Metals and Alloys Sio2 al2o3 Slag Thermodynamics engineering.material Condensed Matter Physics Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium engineering Saturation (magnetic) Phase diagram |
| Zdroj: | Metallurgical and Materials Transactions B. 42:535-545 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-011-9500-y |
| Popis: | The activities of MnO and MnS in a MnO-SiO2-Al2O3(or AlO1.5)-MnS liquid oxysulfide solution were investigated by employing the gas/liquid/Pt-Mn alloy chemical equilibration technique under a controlled atmosphere at 1773 K (1500 °C). Also, the sulfide capacity, defined as CS = (wt pct S)(pO2/pS2)1/2, in MnO-SiO2-Al2O3 slag with a dilute MnS concentration was obtained from the measured experimental data. As XSiO2/(XMnO + XSiO2) in liquid oxysulfide increases, the activity coefficient of MnO decreases, while that of MnS first increases and then decreases. As X(AlO1.5) in liquid oxysulfide increases, the activity coefficient of MnS increases, while no remarkable change is observed for the activity coefficient of MnO. The behavior of the activity coefficient of MnS was qualitatively analyzed by considering MnO + AxSy(SiS2 or Al2S3) = MnS + AxOy(SiO2 or Al2O3) reciprocal exchange reactions in the oxysulfide solution. The behavior was shown to be consistent with phase diagram data, namely, the MnS saturation boundary. Quantitative analysis of the activity coefficient of the oxysulfide solution was also carried out by employing the modified quasichemical model in the quadruplet approximation. |
| Databáze: | OpenAIRE |
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