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用直接平衡法研究了1500,1550,1600℃Ni液中Y-S平衡关系,测定了钇的脱硫常数lgK_(YS)及Y,S的一阶活度相互作用系数e_S~Y与温度的关系,并进行了有关的热力学计算。由测得的数据算出Ni液中YS的标准生成自由能△G_((Y)S),钇的标准溶解自由能△G_((Y)(l)→[Y]Ni),活度系数γ_Y~o,以及钇的克原子分数自相互作用系数∑_Y~Y和百分浓度自相互作用系数e_Y~Y与温度的关系。对于反应[Y]_(Ni)+[S]_(Ni)=YS_(s) △G_((Y)S)=-215000+95.53T(cal/mol)脱硫常数: lgK_(YS)=-47000/T+20.86 e_S~Y=-350200/T+179 △G_((Y)(l)→[Y]Ni)=126200-79.31T(cal/mol) lgγ_(Y)=27584/T-15.151 ∑_Y~Y=-127T05/T+69.79 e_Y~Y=-364.8/T+0.2018
The direct equilibrium method was used to study the equilibrium of YS in 1500, 1550 and 1600 ℃ Ni solutions. The relationship between the desorption constant lgK_ (YS) of yttrium and the first-order activity interaction coefficient e_S ~ Y of Y and S and the temperature was also studied. The relevant thermodynamic calculations were carried out. From the measured data, the standard free energy of formation of YS △ G _ ((Y) S), the standard dissolution free energy △ G _ ((Y) (l) → [Y] Ni) of Ni, the activity coefficient γ_Y ~ o, and the relationship between the self-interaction coefficient Σ_Y ~ Y of gram-atom fraction of yttrium and the self-interaction coefficient e_Y ~ Y of percentage concentration with temperature. For the reaction, the desulfurization constant: lgK_ (YS) = - 215000 + 95.53T (cal / mol) 47000 / T + 20.86 e_S ~ Y = -350200 / T + 179ΔG _ ((Y) (l) → [Y] Ni) = 126200-79.31T (cal / mol) lgγ_ (Y) = 27584 / T-15.151 Σ_Y ~ Y = -127T05 / T + 69.79 e_Y ~ Y = -364.8 / T + 0.2018