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Highly efficient extraction separation of uranium(VI) and thorium(IV) from nitric acid solution with di(1-methyl-heptyl) methyl phosphonate
Tan, ML; Huang, C; Ding, SD; Li, F; Li, QN; Zhang, L; Liu, CX; Li, SM
2015
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
Volume146Pages:192—198
Subtype期刊文献
AbstractThe extraction behaviors of U(VI) and Th(IV), as well as the extraction of HNO3 were investigated by using di(1-methyl-heptyl) methyl phosphonate (DMHMP) as an extractant and kerosene as a diluent. Effects of contact time, acidity, concentration of extractant and temperature on the distribution ratios of U(VI) and Th(IV) were evaluated. HNO3 was extracted as mono-solvated species. In the investigation of acidity range from 0.01 to 6.0 mol/L, the distribution ratios of U(VI) and Th(IV) increased at first with the rise of HNO3 concentration up to 3.0 mol/L and then decreased. DMHMP exhibited higher selectivity for U(VI) than for Th(IV) with the separation factor SFU/Th values of 25-120, whereas under the same conditions, tri-n-butyl-phosphate (TBP) only had SFU/Th, values of 1.4-26. Slope analyses showed that U(VI) and Th(IV) were extracted as di-solvated and tri-solvated species respectively. The thermodynamic parameters (Delta H, Delta S and Delta G) were presented and revealed that the extraction was exothermic. For the extraction of Th(VI) from various HNO3 by 30 vol.% DMHMP or TBP, the limiting organic concentration (LOC) was also given. FT-IR spectra indicated that it was P=O bond, not P-O bond that took part in the coordination with U(VI) and Th(IV). In addition, the solubility of DMHMP and TBP in various concentration HNO3 was determined using ICP-AES, and their thermal stability in air was also examined through TGA. DMHMP has much lower water solubility and higher thermal stability than TBP. (C) 2015 Elsevier B.V. All rights reserved.
KeywordMolten-salt Reactor 3rd Phase-formation Solvent-extraction Trialkyl Phosphates 3rd-phase Formation Butyl Phosphate Nuclear-power Fuel-cycle Actinides Perspectives
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24472
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Tan, ML,Huang, C,Ding, SD,et al. Highly efficient extraction separation of uranium(VI) and thorium(IV) from nitric acid solution with di(1-methyl-heptyl) methyl phosphonate[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2015,146:192—198.
APA Tan, ML.,Huang, C.,Ding, SD.,Li, F.,Li, QN.,...&Li, SM.(2015).Highly efficient extraction separation of uranium(VI) and thorium(IV) from nitric acid solution with di(1-methyl-heptyl) methyl phosphonate.SEPARATION AND PURIFICATION TECHNOLOGY,146,192—198.
MLA Tan, ML,et al."Highly efficient extraction separation of uranium(VI) and thorium(IV) from nitric acid solution with di(1-methyl-heptyl) methyl phosphonate".SEPARATION AND PURIFICATION TECHNOLOGY 146(2015):192—198.
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