铈和铽氧化物酸分解过程热力学研究

Thermodynamic Study on Acid Decomposition Process of Cerium and Terbium Oxides

通过热力学计算,建立了298.15K时Ce和Tb氧化物酸分解过程的φ-pH图。结果表明,CeO_2与TbO_2两种氧化物均难以被酸直接分解,但在还原性条件下采用酸分解可使其转化为Ce^(3+)和Tb^(3+);与CeO2和TbO2相比,Ce_2O_3和Tb_2O_3能在较高的pH值条件下被酸直接分解成Ce^(3+)和Tb^(3+),从而实现对Ce和Tb的提取。

Theφ-pH diagrams of acid decomposition process of oxides of cerium and terbium at 298.15 K were studied by thermodynamic calculation.The results show that CeO2 and TbO2are difficult to be directly decomposed by acid,but they can be transformed into Ce^3＋and Tb^3＋by acid decomposition in a reductive environment.Compared with CeO2 and TbO2,Ce2O3 and Tb2O3can be directly decomposed into Ce^3＋and Tb^3＋by acid with high pH value,which actualizes the extraction of cerium and terbium.