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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。
Based on the difference of thermodynamic behavior between rare earth chloride and KCl in the formation of gaseous complex KRECl4, the rare earth chloride and KCl are mixed at a molar ratio of 1: 1, and the rare earth oxides, NH4Cl and KCl are mixed in RE: N: KCl = 1 : 6: 1 (RE = La, Ce, Pr, Nd) molar ratio of mixed chemical vapor phase transport reaction to study the mixed rare earth compound separation characteristics. The experimental results show that the single rare earth oxide -NH4Cl-KCl can transfer rare earths PrCl3> NdCl3> LaCl3> CeCl3 in the temperature range from 650 ℃ to 800 ℃. The maximum separation coefficient of SFLa / Ce (5) = 2.51, SFPr / La (5) = 3.86 and SFNd / La (4) = 2.61 , SFPr / Ce (5) = 9.76, SFNd / Ce (4) = 4.28, SFNd / Pr (2) = 2.50. The maximum separation coefficient of SFLa / Ce (2) = 3.01, SFPr / La (6) = 3.31 and SFNd / La (4) were obtained for the reaction of quaternary adjacent mixed light rare earth oxides -NH4Cl- = 2.47, SFPr / Ce (5) = 8.84, SFNd / Ce (6) = 5.02, and SFNd / Pr (2) = 2.02.