ソーダ系フラックスによる高マンガン溶鉄の脱りん

抄録

Experiments of dephosphorization of the molten iron containing manganese (13-35 wt%), carbon (0-5 wt%), and phosphorus (0.1 wt%) by the Na₂O-based fluxes (Na₄SiO₄, Na₄SiO₄-NaF) were carried out in a temperature range from 1 300°C to 1 550°C. The effects of carbon and manganese contents in the molten iron, NaF and MnO₂ additions to the flux, and temperature on dephosphorization were investigated. Phosphorus distribution ratios obtained at the end of runs as affected by carbon content in the melt and Na₂O and MnO contents in the slag were also investigated. In addition, the equilibrium concentration of phosphorus in molten iron was calculated from the thermodynamic data. The calculated phosphorus concentration was represented in terms of manganese and carbon contents in molten iron and compared with the observed one.