電気化学的手法による溶融高炉系スラグ中の酸化鉄活量の測定(高炉内反応の基礎とモデル)(<特集>製銑)

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Activity measurement of Fe_TO in molten blast furnace (B.F.) type slags by the method of equilibrating molten slag with iron melt or gas involves great difficulties due to fairly low oxygen potential or a small content of Fe_TO in molten slags. Then, in this work, EMF method was adopted for αFe_TO measurement in B.F. type slags. The activity of Fe_TO (αFe_TO) was calculated from EMF of the following cell. Fe(pure solid)/CaO-SiO_2-Al_2O_3(-MgO)-Fe_TO/O_2, Pt. Oxygen pressure in the cell at EMF measure-ment was kept at approximately 10^<-10> atm, at 1400℃ by CO-CO_2 mixture. A Pt-O_2 electrode with a Pt ring was employed as the standard electrode. The results obtained are summarized as follows : (1) αFe_TO in the melt of CaO-SiO_2-Al_2O_3-Fe_TO (CaO/SiO_2=0.4∿1.2 mol% ratio, Al_2O_3=12.5 mol%) indicates a positive deviation from the ideality in the range of Fe_TO content 0.2∿10 mol% at 1400℃. Activity coefficient (γFe_TO) at 1400℃ increases from 1.4 to 2.0 with increase in CaO/SiO_2 ratio from 0.4 to 1.2. (2) The value of αFe_TO in the melts of CaO-SiO_2-Al_2O_3-MgO-Fe_TO indicates less positive departure from the ideal solution behavior in the range of Fe_TO content 0.2∿2 mol% at 1400℃ than those in the melts without MgO. (3) Thermodynamic quantities of mixing of Fe_TO were calculated by using the data of log αFe_TO versus reciprocal absolute temperature (1/T). Gibbs's partial molar free energy of mixing of Fe_TO in the melts of CaO-SiO_2-Al_2O_3 increases from -17 to -5 kcal/mol with increasing Fe_TO content in the range of 0.3∿10 mol%.
社団法人日本鉄鋼協会の論文
1982-11-01

電気化学的手法による溶融高炉系スラグ中の酸化鉄活量の測定(高炉内反応の基礎とモデル)(<特集>製銑)

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