化学气相传输法分离稀土混合氧化物Sm_2O_3-Eu_2O_3-Gd_2O_3

Separation of Sm_2O_3-Eu_2O_3-Gd_2O_3 System through Chemical Vapor Transportation

以ＡｌＣｌ３ 为络合物配体， 研究Ｓｍ２Ｏ３Ｅｕ２Ｏ３Ｇｄ２Ｏ３ 的分离特性。结果表明， 其传输能力为：Ｓｍ ≈Ｇｄ＞ Ｅｕ， 氯化物主要在９８０ ～１１００ Ｋ 沉积。不同温区的最大分离系数分别为： βＥｕ／Ｓｍ；１２００ Ｋ＝ １－７０ ，βＥｕ／Ｇｄ；１３００ Ｋ＝ １－８８ ， βＳｍ／Ｇｄ；１３００ Ｋ ＝ １－２４ ， β′Ｓｍ／Ｅｕ；８５０ ～８８０ Ｋ＝ ２－７６ ， β′Ｇｄ／Ｅｕ；８８０～９００ Ｋ ＝ ２－８３ ， β′Ｇｄ／Ｓｍ；８００ Ｋ＝１－１２ ， 高于传统的湿法分离系数。

Separation characteristics of neighboring rare earths from the ternary oxide mixtures Sm 2O 3 Eu 2O 3 Gd 2O 3 were investigated using the chemical vapor transportation method mediated AlCl 3 as a complex ligand. Transport amount of elements is in the order of Sm≈Gd>Eu and the major amounts of chlorides of Sm, Eu and Gd are deposited in the middle temperature range of 980～1100 K. The largest separation factors in different temperature ranges, which are expressed as molar ratio for the resulting chlorides, are β Eu/Sm; 1200 K =1 70, β Eu/Gd; 1300 K =1 88, β Sm/Gd; 1300 K =1 24, β′ Sm/Eu; 850～880 K =2 76, β′ Gd/Eu; 880～900 K =2 83, β′ Gd/Sm; 800 K =1 12, which are much higher than those of the conventional wet process.