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SFNdLa/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.
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