COUNTER-CURRENT EXTRACTION OF NEPTUNIUM FROM SIMULATED PRESSURIZED HEAVY WATER REACTOR HIGH LEVEL WASTE USING N,N,N′,N′-TETRAOCTYL DIGLYCOLAMIDE

被引：18
|
作者：
Ansari, S. A. [1 ]
Gujar, R. B. [1 ]
Prabhu, D. R. [1 ]
Pathak, P. N. [1 ]
Mohapatra, P. K. [1 ]
机构：
[1] Bhabha Atom Res Ctr, Div Radiochem, Bombay 400085, Maharashtra, India
来源：
SOLVENT EXTRACTION AND ION EXCHANGE | 2012年 / 30卷 / 05期
关键词：
Neptunium; TODGA; diglycolamide; counter-current; extraction; waste management; MINOR ACTINIDES; CATALYZED OXIDATION; TODGA; LANTHANIDES; KINETICS;
D O I：
10.1080/07366299.2012.670601
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The extraction behavior of neptunium was investigated from Pressurized Heavy Water Reactor Simulated High Level Waste (PHWR-SHLW) using 0.05 M N,N,N',N'-tetraoctyl diglycolamide (TODGA) + 5% iso-decanol dissolved in n-dodecane as the extractant. Batch extraction data revealed that the extraction of Np(IV) was a magnitude of order higher than that of the Np(VI). The stoichiometry of the extracted species was investigated by slope analysis and was found to be 2:1 (Ligand : Metal) for Np(IV) and 1:1 for Np(VI). The distribution data suggested that the neptunium in SHLW was predominantly converted into Np(VI) and its extraction decreased. Counter-current extraction studies employing 12 stages of mixer settler suggested that similar to 97% extraction of Np was possible from PHWR-SHLW at organic-to-aqueous phase ratio (O/A) of 1. However, stripping was efficient and > 99.9% of Np could be back extracted in 8 stages from the loaded organic phase.
引用
收藏
页码：457 / 468
页数：12
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