Abstract
The thermodynamic behavior of phosphide ions in the CaO-CaF2 flux in equilibrium with a SiMn(-Fe) alloy melt was investigated under a strongly reducing atmosphere at 1823 K (1550 °C). The phosphide capacity increased with increasing CaO concentration in the flux before reaching a constant value. The composition for the saturating capacity is in good agreement with the saturation content of CaO in the CaO-CaF2 flux at 1823 K (1550 °C). The relationship between the phosphide capacity and the activity of CaO in the flux exhibited a linear relationship on the logarithmic scale, indicating that phosphorus was removed from the SiMn(-Fe) melt by the reducing refining mechanism.
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