SEPARATION OF Ce(Ⅳ) AND Th(Ⅳ) FROM RE(Ⅲ) IN HNO_3 SOLUTION BY CYANEX 923 EXTRACTANT

Abstract

Abstract: The solvent extinction behavior Of Th(Ⅳ) and Ce(Ⅳ) with Cyanex 925 in nhexane hem nitric acid medium was studied. The extinction mechanisms of Th(Ⅳ)and Ce(Ⅵ) by Cyanex 923 were determined by the method of slope analysis, and the extracted species might be Th(NO3)4.S(Cyanex 923)(o) and Ce(NO3)4.2(Cyanex 923)(o). The extraction characteristics with purified Cyanex 925 and commercial Cyanex 925 were compared. Results showed Ce(Ⅳ) and Th(Ⅳ) could be separted with Cyanex 923 hem RE(Ⅲ) in nitric acid solution. The influence of temperature　on the Th(Ⅳ) extinction was investigated and the thermodynamic functions were calculated.

Key words: separation, Ce(Ⅳ), Th(Ⅳ), RE(Ⅲ), Cyanex 923

J. Lu and D.Q. Li(Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, The Chinese Academy of Sciences, Changchun 130022, China)Z.G. Wei and Z.C. Jiang(Department of Chemistryt Wuhan University, Wuhan 430072, China)Manuscript received in revised form 12 October 1998. SEPARATION OF Ce(Ⅳ) AND Th(Ⅳ) FROM RE(Ⅲ) IN HNO_3 SOLUTION BY CYANEX 923 EXTRACTANT[J]. Acta Metallurgica Sinica (English Letters), 1999, 12(2): 191-197.

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SEPARATION OF Ce(Ⅳ) AND Th(Ⅳ) FROM RE(Ⅲ) IN HNO_3 SOLUTION BY CYANEX 923 EXTRACTANT

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