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用直接法首次研究了1300℃～1500℃碳饱和铁水中[Y]-[S]平衡关系。测得了钇的脱硫常数与温度的关系:lgK_(YS)=-22663/T+ 7.9;得到Fe-C(饱和)体系钇的表观脱硫常数与温度的关系:lgK_(YS)=-3487/T-1.1,硫化钇在碳饱和铁水中标准生成自由能与温度的关系:△G_(YS)=-103680+36.14T(卡/摩尔钇)=-433800+151.21T(焦耳/摩尔钇);得到钇在碳饱和铁水中的溶解自由能与温度的关系:△G_Y(e)→[Y]=18820-21.91T(卡/摩尔钇)=78740-91.67T(焦耳/摩尔钇);得到相互作用系数e_S~Y与温度的关系:e_S~Y=-47072/T+19.5。碳对钇和硫的相互作用系数正负相反影响,随温度升高逐渐减小,在1600℃时接近抵消。本实验为钇用于铁水脱硫提供了有用的热力学数据。
The direct relationship between [Y] - [S] and carbon saturation in molten iron at 1300 ℃ ~ 1500 ℃ was studied for the first time. The relationship between the desulfurization constant of yttrium and temperature is obtained: lgK_ (YS) = -22663 / T + 7.9; The relationship between the apparent desulfurization constant and the temperature of yttrium in the Fe-C -1.1, yttrium sulfide in carbon saturated hot metal standard free energy and temperature relationship: △ G_ (YS) = - 103680 + 36.14T (cal / mol yttrium) = - 433800 +1 151.21T (Joule / mol yttrium); get Relationship between the Dissolved Free Energy of Yttrium in Carbon Saturated Hot Metal and Temperature: ΔG_Y (e) → [Y] = 18820-21.91T (cal / mole yttrium) = 78740-91.67T (Joule / mole yttrium); interaction was obtained Coefficient e_S ~ Y and temperature: e_S ~ Y = -47072 / T + 19.5. Carbon yttrium and sulfur interaction coefficient positive and negative impact, with the temperature decreases gradually, near 1600 offset at. This experiment provides useful thermodynamic data for yttrium for hot metal desulfurization.