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Title: Reduction-oxidation of actinides extraction process (ROANEX) for used nuclear fuel recycling

Abstract

The invention relates to the ROANEX method, which extracts actinides from used nuclear fuel in a single purification cycle. The used nuclear fuel contains actinides, U, Am, Pu, Np. and Cm, and fission products, Cs, Sr and Tc. The fission products are separated first from the used nuclear fuel. The actinides are reduced to their lowest oxidation states and then oxidized to their highest oxidations states. Uranium, Pu and Np move to an organic phase solution and Am and Cm move to a nitrate solution. Uranium, Pu, and Np are stripped from the organic phase solution, and then treated with an oxalic acid to form a precipitate. Americium and Cm are treated with a potassium carbonate solution and Am precipitates. Actinides Am, U, Pu, and Np precipitates are heated in an oven and then blended together to form a mixed oxide fuel of UO2, PuO2, NpO2 and AmO2.

Inventors:
;
Issue Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1568376
Patent Number(s):
10,297,355
Application Number:
15/378,191
Assignee:
U.S. Department of Energy (Washington, DC)
DOE Contract Number:  
AC07-05ID14517
Resource Type:
Patent
Resource Relation:
Patent File Date: 12/14/2016
Country of Publication:
United States
Language:
English

Citation Formats

Riddle, Catherine Lynn, and Paviet, Patricia D. Reduction-oxidation of actinides extraction process (ROANEX) for used nuclear fuel recycling. United States: N. p., 2019. Web.
Riddle, Catherine Lynn, & Paviet, Patricia D. Reduction-oxidation of actinides extraction process (ROANEX) for used nuclear fuel recycling. United States.
Riddle, Catherine Lynn, and Paviet, Patricia D. Tue . "Reduction-oxidation of actinides extraction process (ROANEX) for used nuclear fuel recycling". United States. https://www.osti.gov/servlets/purl/1568376.
@article{osti_1568376,
title = {Reduction-oxidation of actinides extraction process (ROANEX) for used nuclear fuel recycling},
author = {Riddle, Catherine Lynn and Paviet, Patricia D.},
abstractNote = {The invention relates to the ROANEX method, which extracts actinides from used nuclear fuel in a single purification cycle. The used nuclear fuel contains actinides, U, Am, Pu, Np. and Cm, and fission products, Cs, Sr and Tc. The fission products are separated first from the used nuclear fuel. The actinides are reduced to their lowest oxidation states and then oxidized to their highest oxidations states. Uranium, Pu and Np move to an organic phase solution and Am and Cm move to a nitrate solution. Uranium, Pu, and Np are stripped from the organic phase solution, and then treated with an oxalic acid to form a precipitate. Americium and Cm are treated with a potassium carbonate solution and Am precipitates. Actinides Am, U, Pu, and Np precipitates are heated in an oven and then blended together to form a mixed oxide fuel of UO2, PuO2, NpO2 and AmO2.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {5}
}

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Works referenced in this record:

Extractant composition including crown ether and calixarene extractants
patent, April 2009


Process for recovering actinide values
patent, June 1980


Cesium and strontium extraction using a mixed extractant solvent including crown ether and calixarene extractants
patent, November 2007


Method for the recovery of actinide elements from nuclear reactor waste
patent, July 1979