Study on the kinetics and mechanism of Am(III) with TODGA
- China Institute of Atomic Energy, P.O.Box 275-26, Beijing 102413 (China)
The removal of minor actinides (mainly Am, Cm and Np) from the high-level waste would remarkably reduce the necessary storage time. Recently developed, a tridentate ligand, N,N,N',N'-tetraoctyl diglycolamide (TODGA), has been identified as one of the most powerful extractants being considered for the partitioning of trivalent actinides and lanthanides. In the present paper, the extraction kinetics behavior of Am(III) in TODGA/n-dodecane-HNO{sub 3} system has been studied, dependent on various parameters such as the stirring speed, the interfacial area, the extractant concentration in n-dodecane, the extracted ions concentration, the acidity of aqueous phase and the temperature. The results show that: the extraction process is controlled by diffusion mode under 130 rpm of stirring speed and by chemical reaction mode above 150 rpm. The extraction rate equation is given in the paper and the apparent extraction rate constant of Am(III) by TODGA/n-dodecane in 170 rpm and at 25 Celsius degrees is k=(24.2±3.4)*10{sup -3} mol{sup -2.18}*L{sup 2.18}*min{sup -1}*cm. The initial extraction rate of Am(III) by TODGA/n-dodecane at 170 r/min and 25 Celsius degrees increases with increasing temperature, and the apparent active energy is calculated to be E{sub a}=(25.94±0.98) kJ/mol.
- Research Organization:
- American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 22257868
- Resource Relation:
- Conference: GLOBAL 2013: International Nuclear Fuel Cycle Conference - Nuclear Energy at a Crossroads, Salt Lake City, UT (United States), 29 Sep - 3 Oct 2013; Other Information: Country of input: France; 20 refs.; Related Information: In: Proceedings of GLOBAL 2013: International Nuclear Fuel Cycle Conference - Nuclear Energy at a Crossroads| 1633 p.
- Country of Publication:
- United States
- Language:
- English
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