Dephosphorization of Fe-Mn-C Molten Alloys

Abstract

The dephosphorization of Fe-Mn-5%C-0.1%P melts containing 4 to 27% of manganese was studied by using K₂CO₃-KF, K₂CrO₄-KF, and K₂CO₃-KCl fluxes. As a result, 75% of phosphorus was removed from Fe-16%Mn-5%C-0.1%P melt by 70%K₂CO₃-30%KF at 1250°C with 2% of manganese loss, for example. The 50%K₂CrO₄-50%KF flux was as effective for the dephosphorization below 20% of manganese as 70%K₂CO₃-30%KF but the manganese loss was less than in the latter case.
The phosphate capacity defined as (%PO₄^3-)·P_p2^-1/2·P_O2^-5/4 was estimated for various fluxes and that of the K₂CO₃-KF flux, 10²⁶ was found to be far greater than those of conventional slags.