Abstract
The solubility of calcium and oxygen in molten iron equilibrated with CaO-Al2O3-ZrO2 molten slag in CaO, Al 2O3 or 5.5 mass% CaO-stabilized ZrO2 crucible at 1 873 K was measured by means of the slagmetal equilibrium partition method under Ar gas atmosphere. From the results by XRD and the phase diagram of CaO-Al2O3-ZrO2 system, the slag in a CaO crucible was in equilibrium with CaO·ZrO2 and CaO and the slag composition was 57.36 mass% CaO-34.86% Al2O3-7.78% ZrO2. The slag in a Al2O3 crucible was in equilibrium with CaO·2Al2O3 and ZrO2-CaO solid solution (Css) and the slag composition was 27.08 mass% CaO-53.42% Al2O3-19.50% ZrO2. The slag in a CaO-stabilized ZrO2 crucible was in equilibrium with ZrO2-CaO solid solution (Css) and CaO·ZrO2 and the slag composition was 30.38 mass% CaO- 51.56% Al2O3-18.06% ZrO2. The average concentrations of oxygen and calcium in molten iron in equilibrium with slag and compounds were 251 ppm and 3 ppm in a CaO crucible, 33 ppm and 4 ppm in an Al2O3 crucible and 21 ppm and 5 ppm in a CaO-stabilized ZrO2 crucible, respectively. The logarithm of equilibrium constant, logK, for the reaction of CaO(s) = Ca + O is -4.38 and the interaction parameter of eCa°O is -31.8. The value is satisfied the thermodynamic phase stability.
Original language | English |
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Pages (from-to) | 1369-1374 |
Number of pages | 6 |
Journal | Isij International |
Volume | 51 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2011 Sep 15 |
Keywords
- AlO
- CaO
- CaO-stabilized ZrO
- Calcium
- Molten iron
- Oxygen
- Solubility
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry