Double liquid membrane system for the removal of actinides and lanthanides from acidic nuclear wastes

Conference · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5263452

Chiarizia, R; Danesi, P R

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 nitric acid 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 HNO/sub 3/ 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 HNO/sub 3/ concentration in the strip solution, thus allowing the actinide and lanthanide ions removal from the feed solution to proceed to completion. 15 refs., 10 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 5263452
• Report Number(s): CONF-851011-2; ON: DE85018443
• Resource Relation: Conference: 4. symposium on separation science and technology for energy applications, Knoxville, TN, USA, 20 Oct 1985; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ACTINIDES
SEPARATION PROCESSES
RARE EARTHS
DECALIN
EXPERIMENTAL DATA
FORMATES
FORMIC ACID
NITRIC ACID
ORGANIC PHOSPHORUS COMPOUNDS
RADIOACTIVE WASTES
SUPPORTED LIQUID MEMBRANES
TBP
ALKANES
BUTYL PHOSPHATES
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CYCLOALKANES
DATA
ELEMENTS
ESTERS
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
MATERIALS
MEMBRANES
METALS
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHOSPHORIC ACID ESTERS
RADIOACTIVE MATERIALS
WASTES
400105* - Separation Procedures
052001 - Nuclear Fuels- Waste Processing