Double liquid membrane system for the removal of actinides and lanthanides from acidic nuclear wastes
Supported liquid membranes (SLM), consisting of an organic solution of n-octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) and tributyl-phosphate (TBP) in decalin are able to perform selective separation and concentration of actinide and lanthanide ions from aqueous nitrate feed solutions and synthetic nuclear wastes. In the membrane process a possible strip solution is a mixture of formic acid and hydroxylammonium formate (HAF). The effectiveness of this strip solution is reduced and eventually nullified by the simultaneous transfer through the SLM of HNO3 which accumulates in the strip solution. A possible way to overcome this drawback is to make use of a second SLM consisting of a primary amine which is able to extract only HNO3 from the strip solution. In this work the results obtained by experimentally studying the membrane system: synthetic nuclear waste/CMPO-TBP membrane/HCOOH-HAF strip solution/primary amine membrane/NaOH solution, are reported. They show that the use of a second liquid membrane is effective in controlling the HNO3 concentration in the strip solution, thus allowing the actinide and lanthanide ions removal from the feed solution to proceed to completion.
- Research Organization:
- Argonne National Lab., IL
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6372383
- Report Number(s):
- CONF-851011-; TRN: 87-028367
- Journal Information:
- Sep. Sci. Technol.; (United States), Vol. 22:2/3; Conference: 4. symposium on separation science and technology for energy applications, Knoxville, TN, USA, 20 Oct 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ACTINIDES
REMOVAL
SEPARATION PROCESSES
MEMBRANES
PERFORMANCE
NITRATES
RADIOACTIVE WASTES
RARE EARTHS
AQUEOUS SOLUTIONS
AROMATICS
EXPERIMENTAL DATA
LIQUIDS
OXIDES
PH VALUE
PHOSPHINES
TBP
BUTYL PHOSPHATES
CHALCOGENIDES
DATA
DISPERSIONS
ELEMENTS
ESTERS
FLUIDS
INFORMATION
MATERIALS
METALS
MIXTURES
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
PHOSPHORUS COMPOUNDS
RADIOACTIVE MATERIALS
SOLUTIONS
WASTES
400105* - Separation Procedures
052001 - Nuclear Fuels- Waste Processing