化学气相传输法分离二元混合重稀土氧化物

Separation of Rare Earth Elements from Their Binary Oxide Mixtures via Chemical Vapor Transport Reaction

基于不同稀土氯化物在高温与AlCl3 生成气态配合物LnAlnCl3n + 3 的热力学行为不同 ,利用化学气相传输法研究了二元相邻混合重稀土氧化物Ho2 O3 Er2 O3 、Er2 O3 Tm2 O3 、Tm2 O3 Yb2 O3 和Yb2 O3 Lu2 O3 的分离特性。结果发现 ,Ho、Er、Tm、Yb和Lu的氯化物大量沉积在 80 0～ 10 5 0K的中、低温区。温度愈高 ,原子序数愈小的稀土氯化物优先沉积 ,温度愈低 ,原子序数愈大的稀土氯化物优先沉积。最大分离系数 :SFEr/Ho=1 4 1,SFEr/Tm=1 6 0 ,SFTm/Yb=1 91,SFLu/Yb=1 37。

Separation of the neighboring rare earth elements from their binary oxide mixtures Ho 2 O 3 Er 2 O 3 , Er 2 O 3 Tm 2 O 3 , Tm 2 O 3 Yb 2 O 3 and Yb 2 O 3 Lu 2 O 3 has been carried out via the chemical vapor transport reaction based on the difference in thermodynamic characteristics of their vapor complexes LnAl 3 Cl 3 n +3 . The results showed that most rare earth chlorides of Ho, Er, Tm, Yb and Lu are deposited in the reactor zone of temperature ranged from 800 to 1 050 K. The chlorides of rare earch with small atomic number are preferably deposited in the reactor zone of higher temperature and rice versa . The largest separation factors expressed as molar ratio for the resulting chlorides are SF Er/Ho =1 41, SF Er/Tm =1 60, SF Tm/Yb =1 91, SF Lu/Yb =1 37.