固体鉄と平衡した酸硫化鉄液相中成分の活量

概要

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Equilibrium between H_2-H_2O-H_2S mixtures and iron oxysulphide melts in coexistence of solid iron was accomplished by means of the gas circulating method. The temperature range of measurements was 1000 to 1200℃, and the mole fractions of oxygen and sulphur in the melt were N_O=0∿0.35 and N_S=0.18∿0.43, respectively. The oxygen pressure in gas was measured by oxygen galvanic cell using calcia-stabilized zirconia as a solid electrolyte. The sulphur pressure in gas was determined by chemical analysis. The activities of oxygen and sulphur in the melt showed slightly positive deviation from the fractional concentration of each anion i, N′_i=Ni/(N_O+N_S) modified by a solution model. The partial molar quantities of species in the solution at 1100℃ were calculated from results of the activities. It was shown that oxygen exothermically dissolves into the solution and has a small inclination of imperfect mixing at N_O^′=0.2, whereas sulphur plays nearly an ideal behavior in the solution. The sulphur potential in equilibrium with iron, wustite and the melt was in close agreement with those in earlier works.
社団法人日本鉄鋼協会の論文
1988-04-01