Bidentate organophosphorus extraction of americium and plutonium from Hanford Plutonium Reclamation Facility waste
Applicability of bidentate organiphosphorus reagents to recovery of americium and plutonium from Hanford's Plutonium Reclamation Facility acid (approx. 2M HNO/sub 3/) waste stream (CAW solution) was studied. A solvent extraction process which employs a 30% DHDECMP (dihexyl-N, N-diethylcarbamylmethylene phosphonate)-CCl/sub 4/ extractant was devised and successfully tested in mixer-settler runs with actual CAW solution. Substitution of DHDECMP for DBBP eliminates the need to perform careful neutralization of unbuffered CAW soluton and increases overall americium recovery from the present 60 to 80% level to greater than or equal to 90%. Disadvantages to such substitution include the high cost (approx. $50/liter) of DHDECMP and the need to purify it (by acid (6M HCl) hydrolysis and alkaline washing) from small amounts of an unidentified impurity which prevents stripping of americium with dilute HNO/sub 3/. Distribution data obtained in this study confirm Siddall's earlier contention that bidentate organophosphorus regents can be used to remove actinides from concentrated high-level Purex process acid waste; a conceptual flowsheet for such an extraction process is given.
- Research Organization:
- Atlantic Richfield Hanford Co., Richland, WA (USA)
- DOE Contract Number:
- AM06-76RL02130
- OSTI ID:
- 5251752
- Report Number(s):
- ARH-SA-203; CONF-750607-57
- Resource Relation:
- Conference: American Nuclear Society meeting, New Orleans, LA, USA, 8 Jun 1975
- Country of Publication:
- United States
- Language:
- English
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Secondary recovery of plutonium and americium from process waste streams by solvent extraction
Bifunctional organophosphorus extractants for actinide recovery and purification. [Dihexyl-N,N-diethylcarbamoylmethylenephosphonate (DBDECMP)]
Related Subjects
AMERICIUM
RECOVERY
PLUTONIUM
RADIOACTIVE WASTE PROCESSING
SOLVENT EXTRACTION
CARBON TETRACHLORIDE
DHDECMP
HIGH-LEVEL RADIOACTIVE WASTES
MIXER-SETTLERS
PUREX PROCESS
ACTINIDES
CHLORINATED ALIPHATIC HYDROCARBONS
ELEMENTS
ESTERS
EXTRACTION
EXTRACTION APPARATUSES
HALOGENATED ALIPHATIC HYDROCARBONS
MANAGEMENT
METALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHONIC ACID ESTERS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
REPROCESSING
SEPARATION PROCESSES
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
052001* - Nuclear Fuels- Waste Processing