Actinide and lanthanide separation process (ALSEP)
The process of the invention is the separation of minor actinides from lanthanides in a fluid mixture comprising, fission products, lanthanides, minor actinides, rare earth elements, nitric acid and water by addition of an organic chelating aid to the fluid; extracting the fluid with a solvent comprising a first extractant, a second extractant and an organic diluent to form an organic extractant stream and an aqueous raffinate. Scrubbing the organic stream with a dicarboxylic acid and a chelating agent to form a scrubber discharge. The scrubber discharge is stripped with a simple buffering agent and a second chelating agent in the pH range of 2.5 to 6.1 to produce actinide and lanthanide streams and spent organic diluents. The first extractant is selected from bis(2-ethylhexyl)hydrogen phosphate (HDEHP) and mono(2-ethylhexyl)2-ethylhexyl phosphonate (HEH(EHP)) and the second extractant is selected from N,N,N,N-tetra-2-ethylhexyl diglycol amide (TEHDGA) and N,N,N',N'-tetraoctyl-3-oxapentanediamide (TODGA).
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-06CH11357
- Assignee:
- U.S. Department of Energy (Washington, DC)
- Patent Number(s):
- 8,354,085
- Application Number:
- 13/422,006
- OSTI ID:
- 1082858
- Resource Relation:
- Patent File Date: 2012 Mar 16
- Country of Publication:
- United States
- Language:
- English
Process for the separation of actinides from lanthanides by the selective extraction of the actinides in an organic solvent incorporating a propane diamide
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patent | October 1993 |
Method of separating trivalent actinides and rare earth elements
|
patent | January 1998 |
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