<正> 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。
The liquid boundary of the slags of Ce_2O_3-CaO-CaF_2 system and the iso-activity lines for Ce_2O_3 and CeO_2 are given from experimental determination of the activity of Ce_2O_3 by equilibrating the slag with Sn in a graphite crucible under an atmosphere of CO at 1600℃. The activity of Ce_2O_3 in the slags containing certain CeO_2 or CaO, increases with the increase of concentration of CaO or CeO_2 respectively. The transition of CeO_2 to Ce_2O_3 under the condition of high temperature and low oxygen partial pressure was also discussed by thermodynamical analysis.
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