| A study has been made of the distribution equilibria of sulfur between liquid iron and stags of Fe_tO-MgO, Fe_tO-SiO₂-MgO and Fe_tO-SiO₂-CaO-MgO systems saturated with MgO. 1) The distribution ratio of sulfur, Ls, in Fe_tO-SiO₂-MgO(sat) slags increases as Fe_tO content increases, as a result of the corresponding decrease in the amount of (SiO₂＋MgO) content. 2) In Fe_tO-SiO₂-CaO-MgO(sat) slags, the values of Ls increase with the molar ratio of bases to acid, and as Fe_tO content increases, the values of Ls increase progressively at the higher basicity than about 2.0, but less basic stags result in a increases of Ls. 3) It is considered that Fe_tO contributes to the increase of oxygen potential rather than a_(o 2)- in the higher basic range, while Fe_tO contributes to the increase of a_(o 2)-in the less basic range. 4) The sulfur equilibrium in Fe_tO-MgO(sat) slags is expressed by the equation of Log{(%S)·[a_o]/[a_s] } = -4,560/T＋2.22, and the value of ΔH˚is estimated to 21 ㎉/㏖. But due to the compensation of endothermic effect by the corresponding increase with temperature in [a_o] , the values of Ls are found to be nearly independent of temperature in the experimental range. 5) The sulfide capacity, Cs, decreases considerably as SiO₂content increases, and is fairly correlated with the modified base concentration, N`_(Base) (= N_(cao)＋0.8N_(FeO) ＋0.5N_(MgO)), regardless of slag systems and compositions. The order of desulfurizating power is CaO > FeO > MgO. |
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