質量分析法による Fe_tO-P_2O_5 系中の P_2O_5 と CaO, MgO, MnO 及び SiO_2 の相互作用母係数の測定

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The effects of CaO, MgO, MnO and SiO_2 on the activity coefficient of P_2O_5 in dilute solution of P_2O_5 in Fe_tO were determined at 1370℃ by the use of a mass spectrometer-Knudsen cell combination. The activity of P_2O_5 was determined by the use of the following chemical equilibrium. Iron vapor in equilibrium with solid iron was used as internal standard. PO(g)+P_2O_5(in slag)=3PO_2(g) α_<P_2O_5>=K・P^3_<PO_2>/P_<PO>=K′・(I^+_<PO_2>/I^+_<Fe>)^3/(I^+_<PO>/I^+_<Fe>) The interaction parameters have been calculated from the activity coefficient of P_2O_5 with the aid of the least square method. The obtained results are as follows. ε^<CaO>_<P_2O_5>=-23±3 ε^<MgO>_<P_2O_5>=-20±2 ε^<MnO>_<P_2O_5>=-13±1 ε^<SiO_2>_<P_2O_5>=-4±1 These interaction parameters are for dilute solution of P_2O_5 in Fe_tO.
社団法人日本鉄鋼協会の論文
1987-08-01