石灰飽和 Fe_tO-CaO-P_2O_5-CaF_2 系スラグと溶鉄間のりん分配平衡

概要

論文の詳細を見る
Equilibrium phosphorus distribution between Fe_tO-CaO-P_2O_5-CaF_2 slags and liquid iron has been studied at 1600℃ under a CaO-saturated condition. The results are summarized as follows, (1) Increase of P_2O_5 content in CaO-saturated Fe_tO-CaO-P_2O_5 slags contributes to an increase of the activity coefficient of iron oxide, γ_<Fe_tO> and also a slight increase of the ratio (Fe^<3+>/Fe^<2+>), but decreases the activity coefficient, γ_<P_2O_5>. (2) For slags containing approximately 10 mass% P_2O_5, an addition of CaF_2 contributes to a decrease of the γ_<P_2O_5> as follows, logγ_<P_2O_5>=2.52N_<Fe_tO>-1.32N_<CaF_2>-19.4 The addition of CaF_2 also increases the γ_<Fe_tO> and the ratio (Fe^<3+>/Fe^<2+>). It suggests that CaF_2 in molten slags behaves as a basic component. (3) For slags having 10 mass% P_2O_5, most suitable slags for the dephosphorization are those containing 40-50 mass% CaF_2.
社団法人日本鉄鋼協会の論文
1992-04-01