Americium removal from nitric acid waste streams
Separations research at the Rocky Flats Plant (RFP) has found ways to significantly improve americium removal from nitric acid (7M) waste streams generated by plutonium purification operations. Partial neutralization of the acid waste followed by solid supported liquid membranes (SLM) are useful in transferring and concentrating americium from nitrate solutions. Specifically, DHDECMP (dihexyl-N,N-diethylcarbamoylmethylphosphonate) supported on Accurel polypropylene hollow fibers assembled in modular form transfers >95% of the americium from high nitrate (6.9M), low acid (0.1M) feeds into 0.25M oxalic acid stripping solution. Maximum permeabilities were observed to be 0.001 cm/sec, consistent with typical values for other systems. The feed:strip volume ratio shows an inverse relationship to the fraction of metal ion transferred. Cation exchangers may be used to concentrate americium from the strip solution. Furthermore, O0D (iB)CMPO (or CMPO) (octylphenyl-N-N-diisobutylcarbamoylmethylphosphine oxide) has been tested in an extraction chromatography mode. Preliminary results show CMPO to be effective in removing americium if the feed is neutralized to 1.0M acidity and iron(III) is complexed with 0.20M oxalic acid. 3 figs.
- Research Organization:
- Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant
- DOE Contract Number:
- AC04-76DP03533
- OSTI ID:
- 5695548
- Report Number(s):
- RFP-4008; CONF-860411-6; ON: DE88005140
- Resource Relation:
- Conference: 1. international conference on separations science and technology, New York, NY, USA, 15 Apr 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMERICIUM
REMOVAL
RADIOACTIVE WASTE PROCESSING
SEPARATION PROCESSES
DHDECMP
EXTRACTION CHROMATOGRAPHY
INORGANIC ION EXCHANGERS
ION EXCHANGE
NITRIC ACID
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHINE OXIDES
PLUTONIUM
ROCKY FLATS PLANT
SUPPORTED LIQUID MEMBRANES
ACTINIDES
CHROMATOGRAPHY
ELEMENTS
ESTERS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ION EXCHANGE MATERIALS
MANAGEMENT
MATERIALS
MEMBRANES
METALS
NATIONAL ORGANIZATIONS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHINES
PHOSPHONIC ACID ESTERS
PHOSPHORUS COMPOUNDS
PROCESSING
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
WASTE MANAGEMENT
WASTE PROCESSING
052001* - Nuclear Fuels- Waste Processing