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本文采用铁液与反应产物直接平衡法,并用浓差定氧和低温无水电解分离反应产物等技术,研究1575、1600、1625℃铁液中钇脱氧、脱硫和脱硫氧的热力学。测定了钇的脱氧常数、脱硫常数和脱硫氧常数;钇与氧的一阶活度相互作用系数,钇与硫的一、二阶活度相互作用系数与温度的关系;铁液中 Y_2O_3、YS、Y_2O_2S 的标准生成自由能、钇的标准溶解自由能、活度系数和自相互作用系数与温度的关系;绘制了[Y]-[S]-[O]平衡立体图和α_O-α_S 平衡图,为预测钇的夹杂物生成的先后次序及类型提供了依据。
In this paper, the thermodynamics of deoxygenation, desulfurization and desulfurization of yttrium in 1575, 1600 and 1625 ℃ molten iron were studied by using the direct equilibrium method of molten iron and reaction products, and the separation of reaction products by concentrated oxygen concentration and low temperature anhydrous electrolysis. The deoxygenation constants, desulfurization constants and desulfurization oxygen constants of yttrium were determined. The first-order activity interaction coefficients of yttrium and oxygen, the first-order and second-order activity interaction coefficients of yttrium and sulfur, and the relationship between temperature and Y_2O_3, YS , The standard free energy of formation of Y 2 O 2 S, the standard dissolution free energy of yttrium, the activity coefficient and the relationship between the self-interaction coefficient and temperature, and the [Y] - [S] - [O] equilibrium and α_O- It provides the basis for predicting the order and type of yttrium inclusion formation.