Untersuchungen über den Einfluß der Kieselsäure und des Oxydationsgrades auf die Phasengrenzen, besonders der Mischungslücke, im System CaO–P₂O₅–FeO–Fe₂O₃–SiO₂ bei 1600 °C

Abstract

Beschreibung der Versuchseinrichtung und Versuchsdurchführung. Versuchsergebnisse im Schlackensystem, CaO–P2O5–FeO–Fe2O3 und in Konzentrationsschnitten bei 5, 10 und 15% SiO2. Einfluß des Sauerstoffpartialdruckes auf die Phasengleichgewichte. Makroskopische und mikroskopische Untersuchung der erstarrten Schlacken. Beschreibung des Verlaufes der Mischungslücke und der Silikophosphatsättigungsfläche.

Study of the State of Industrial P2O5‐Containing Slags Relevant to Steelmaking Processes Based on a New Thermodynamic Database Developed for CaO–FeOx–P2O5–SiO2–MnO–MgO–Al2O3 Slags − Part I: Ternary and Lower Order Systems

“…Overall, the miscibility gap region becomes smaller in favor of more liquid slag. However, the experimental data on the upper boundary of the miscibility gap at elevated p(O 2 ) as well as under air are consistent with the system boundaries at reduced p(O 2 ) . This means that the experimental findings of Drewes et al and Schwerdfeger et al suggest that the miscibility gap is not sensitive to p(O 2 ), which is in disagreement with the calculated behavior.…”

“…However, the experimental data on the upper boundary of the miscibility gap at elevated p(O 2 ) as well as under air are consistent with the system boundaries at reduced p(O 2 ) . This means that the experimental findings of Drewes et al and Schwerdfeger et al suggest that the miscibility gap is not sensitive to p(O 2 ), which is in disagreement with the calculated behavior. Since only the CaO‐rich part of the system is relevant for the industrial process, no further work was undertaken to clarify the discrepancy between the calculations and the experimental data with respect to the upper boundary of miscibility gap.…”

“…Experimental data on the behavior of the system at elevated p(O 2 ) (Table ) were provided by Drewes and Olette while Schwerdfeger and Turkdogan provided data on the behavior of the system “under air” …”

“…Figure shows the calculated phase boundaries at elevated p(O 2 ) together with the aformentioned experimental data . For the sake of comparison, the calculated system boundaries at reduced p(O 2 ) (Figure ) were included in Figure in which they were distinguished by dashed line.…”

“…Effect of p(O 2 ) on the phase boundaries of the CaO–FeO x –P 2 O 5 system at a temperature of 1873 K (1600 °C): Full lines represent the elevated p(O 2 ) case whereas the dashed lines represent the reduced p(O 2 ) case and comparison with experimental data . The original publication of Schwerdfeger and Turkdogan presented the lime saturation line with no specification of the experimental data points: The data points presented here were selected by the present authors from the original lime saturation line …”