摘要
基于稀土氯化物在高温时与KCl生成气态配合物KRECl4的热力学行为差异,将稀土氯化物和KCl按摩尔比1∶1混合,另将稀土氧化物、NH4Cl和KCl按RE:N∶KCl=1∶6∶1(RE=La、Ce、Pr、Nd)的摩尔比混合,进行化学气相传输反应,研究混合稀土化合物的分离特性。实验结果显示,单一轻稀土氧化物-NH4Cl-KCl传输反应在650℃~800℃的温度范围内稀土沉积量PrCl3〉NdCl3〉LaCl3〉CeCl3。四元相邻混合轻稀土氯化物-KCl传输反应,在不同温度区域内最大分离系数分别为SFLa/Ce(5)=2.51,SFPr/La(5)=3.86,SFNd/La(4)=2.61,SFPr/Ce(5)=9.76,SFNd/Ce(4)=4.28,SFNd/Pr(2)=2.50。四元相邻混合轻稀土氧化物-NH4Cl-KCl传输反应,在不同温度区域内最大分离系数分别为SFLa/Ce(2)=3.01,SFPr/La(6)=3.31,SFNd/La(4)=2.47,SFPr/Ce(5)=8.84,SFNd/Ce(6)=5.02,SFNd/Pr(2)=2.02。
Separation of the neighboring rare earth elements from their quaternary mixtures has been carried out via chemi- cal vapor transport reaction based on the difference in the thermodynamic characteristics of their vapor complexes KREC14. The results showed that the deposits amount are PrC13 〉 NdC13 〉 LaC13 〉 CeC13 in a chemical vapor transport reaction formed from pure rare earth oxide - NHaC1 - KC1 in the temperature range 650℃ ~ 800℃. The largest separation factor values for neigh- boring quaternary rare earth chlorides mixture are SFLα,/Ge(5) = 2.51, SFPr/Lα (5) = 3.86, SFNd/Lα(4) = 2.61, SFPr/Ge(5) = 9.76, SFNd/Ge(4) = 4.28, SFNa/Pr(2) = 2.50 in different temperature range. The largest separation factor values for neighboring quaternary rare earth oxides mixture are SFLα/Ge2) = 3.01, SFPr/Lα(6) = 3.31, SFNd/Lα(4) = 2.47, SFPr/Ge(5) = 8.84, SFNd/Ge(6) = 5.02, SFNa/Pr(2) = 2.02 in different temperature range.
出处
《稀土》
EI
CAS
CSCD
北大核心
2011年第3期55-59,共5页
Chinese Rare Earths
基金
辽宁省教育厅科学研究项目计划资助(20060615)
关键词
稀土氧化物
稀土气态配合物
分离
化学气相传输
rare earth oxides
rare earth vapor complexes
separation
chemical vapor transport