溶鉄中の La, Ti, および Zr と S の平衡

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Sulfur equilibria in molten Fe-La-S, Fe-Ti-S and Fe-Zr-S systems are determined by melting Fe-S alloy in an induction furnace with subsequent addition of desulfurizing element, La, Ti, and Zr under deoxidized argon. The possible reaction betweem the desulfurizing element in liquid iron and crucible material was prevented by lining of equilibrium sulfide (3mm thick) on alumina crucible in which the melt was contained. Activity of oxygen in the melt and total oxygen content were lowered by adding about 0.3% Al prior to the addition of the desulfurizing element, so that oxysulfide formation in the melt might be suppressed. The results obtained are summarized as follows : 1) Equilibrium constants for desulfurizing reactions with LaS (s), TiS (s), or Zr_3S_4 (s) as the equilibrium phase are determined to be log K_<La>=-26000/T+8.9_8 log K_<Ti>=-8000/T+4.0_2 log K_<Zr>=-44100/T+19._5 for T from 1818 to 1923 K. 2) Interaction parameters between the desulfurizing element and S are given by e^<(La)>_S=-18.3(1883K), e^<(Ti)>_S=-0.18(1873K), e^<(Zr)>_S=-0.22(1873K) 3) Standard free energy change, ⊿G°, for the reaction; La(1)=<La>___- is derived as ⊿G°=30100-22.6T and that for TiS(s) and Zr_3S_4(s) formation is also determined at 1873K to be -57 and -227 kcal/mol, respectively. 4) Applicability of the equation, given by SAKANO and SANO for the evaluation of ε^<(j)>_o, to that of ε^<(j)>_S in molten iron is examined, using the values of ε^<(La)>_S, ε^<(Ti)>_S, ε^<(Zr)>_S and ε^<(Ce)>_S determined by the authors, and verified to be valid even in the case of ε^<(j)>_S.
1977-05-01

溶鉄中の La, Ti, および Zr と S の平衡

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