Abstract
Carbon distribution ratios between CaO-Al2O3 slags and Fe-0.0003 to 0.8 mass pct Al-0.2 to 5.6 mass pct C alloys were measured at 1873 K in an Al2O3, CaO, or graphite crucible. The carbon distribution ratios were dependent on the oxygen potential, determined by theAl/(Al2O3) equilibrium, not by theC/CO (Pco = 1 atm) equilibrium. The (mass pct C)/ac ratios were proportional to the activity of Al in logarithmic form with a slope of 2/3, indicating that carbon in slag is dissolved as C2− ion. Solubilities of carbon in CaO-Al2O3 slags were also measured at 1873 K under the CO-CO2-Ar gas mixtures in an Al2O3 or graphite crucible. It was found that C2− ion is present in the range of log\(P_{O_2 } \)(atm) −7.
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