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本文在确定1600℃时CeO_2-CaO-CaF_2和Ce_2O_3-CaO-CaF_2渣系熔化范围的基础上,采用化学平衡法研究渣中稀土氧化物的活度,并绘制等活度线,为选择合理的电渣重熔渣系组成提供理论依据。根据CeO_2在高温低氧分压情况下转变为Ce_2O_3的特性,实验所依据的反应为 (Ce_2O_3)+3C_(石墨)=2[Ce]_(Sn)+3CO 以固态Ce_2O_3和液态Ce作为标准态,炉渣中Ce_2O_3活度的计算公式为αCe_2O_3=[N_(Ce)]~2/[N_(Ce)~0]~2 式中N_(Ce)和N_(Ce)~0分别为与某个组成的渣和与固相Ce_2O_3平衡的Sn中的Ce含量。文中并对在高温低氧情况下CeO_2向Ce_2O_3的转变问题进行了热力学分析。
Based on the determination of the melting range of CeO_2-CaO-CaF_2 and Ce_2O_3-CaO-CaF_2 slag system at 1600 ℃, the activity of rare earth oxides in slag was studied by chemical equilibrium method and the activity curves were drawn. Electroslag re slag system to provide a theoretical basis. According to CeO 2 conversion to Ce 2 O 3 under high temperature and low partial pressure of oxygen, the reaction based on Ce_2O_3 + 3C_ (graphite) = 2 [Ce] _ (Sn) + 3CO takes Ce_2O_3 and Ce as the standard states , The activity of Ce_2O_3 in the slag is calculated as α Ce 2 O 3 = [Ce 2] ~ 2 / [Ce 2 ~ 0] ~ 2 where N Ce and Ce Ce are each 0, And the Ce content in Sn balanced with the solid phase Ce 2 O 3. In the paper, the thermodynamic analysis on the conversion of CeO_2 to Ce_2O_3 under the conditions of high temperature and low oxygen was carried out.