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本实验应用化学平衡法,在氧化镁坩埚中,研究含铌的熔渣——溶铁体系的平衡。平衡研究过程中采用固体电解质氧浓差电池: Mo,Cr+Cr_2O_3 l Zr02(MgO)I[O)Fe’Mo直接测定铁液中氧活度。实验温度1800。c。用X射线衍射法鉴定平衡渣样中铌的存在形态。测定铌氧化物在氧化镁饱和的Nb205一Mg0一SiO:一Mn0系渣中的活度以及铌在渣一铁之间的平衡分配系数,并论述了对这些参数的影响因素。应用Temkin离子理论计算了熔渣中的氧化锰活度,与实验所得值进行了比较。
In this experiment, chemical equilibrium method was used to study the balance of niobium-containing slag-iron-dissolving system in magnesia crucible. In the process of equilibrium study, the oxygen concentration in the molten iron was directly determined by the solid electrolyte oxygen concentration cell: Mo, Cr + Cr_2O_3 ZrO2 (MgO) I [O] Fe’Mo. Experimental temperature 1800. c. Identification of Niobium in Balanced Slag Samples by X - ray Diffraction. The activity of niobium oxide in Nb205-Mg0-SiO0: Mn0-based slag saturated with magnesia and the equilibrium partition coefficient of niobium between slag and iron were measured. The influencing factors on these parameters were also discussed. The activity of manganese oxide in slag was calculated by Temkin’s ion theory and compared with the experimental value.