TY - JOUR
T1 - Experimental verification of caustic-side solvent extraction for removal of cesium from tank waste
AU - Leonard, Ralph A.
AU - Aase, Scott B.
AU - Arafat, Hassan A.
AU - Conner, Cliff
AU - Chamberlain, David B.
AU - Falkenberg, John R.
AU - Regalbuto, Monica C.
AU - Vandegrift, George F.
N1 - Funding Information:
A caustic-side solvent extraction (CSSX) process was developed to remove Cs from Savannah River Site (SRS) high-level waste. The CSSX process was verified in a series of flowsheet tests at Argonne National Laboratory (ANL) in a minicontactor (2-cm centrifugal contactor) using simulant. The #The submitted manuscript has been created by the University of Chicago as Operator of Argonne National Laboratory (‘‘Argonne’’) under Contract No. W-31-109-ENG-38 with the U.S. Department of Energy. The U.S. Government retains for itself, and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government. *Correspondence: Ralph A. Leonard, Argonne National Laboratory, Chemical Engineering Division, 9700 South Cass Ave., Argonne, IL 60439, USA; Fax: 630-252-4443; E-mail: [email protected].
Funding Information:
This work was conducted under the integrated research and development program supporting the U.S. Department of Energy’s (DOE) SRS high-level waste (HLW) program, which is responsible for storage, treatment, and
PY - 2003/7
Y1 - 2003/7
N2 - A caustic-side solvent extraction (CSSX) process was developed to remove Cs from Savannah River Site (SRS) high-level waste. The CSSX process was verified in a series of flowsheet tests at Argonne National Laboratory (ANL) in a minicontactor (2-cm centrifugal contactor) using simulant. The CSSX solvent, which was developed at Oak Ridge National Laboratory (ORNL), consists of a calixarene-crown ether as the extractant, an alkylaryl polyether as the modifier, trioctylamine as the suppressant, and Isopar® L as the diluent. For Cs removal from the SRS tank waste, the key process goals are that: (1) Cs is removed from the waste with a decontamination factor greater than 40,000 and (2) the recovered Cs is concentrated by a factor of 15 in dilute nitric acid. In the flowsheet verification tests, the objectives were to: (1) prove that these process goals could be met; (2) demonstrate that they could be maintained over a period of several days as the CSSX solvent is recycled; and (3) verify that the process goals could still be met after the solvent composition was adjusted. The change in composition eliminated the possibility that the calixarene-crown ether could precipitate from the solvent. The process goals were met for each of the verification tests. The results of these tests, which are summarized here, show that the CSSX process is a very effective way to remove Cs from caustic-side waste.
AB - A caustic-side solvent extraction (CSSX) process was developed to remove Cs from Savannah River Site (SRS) high-level waste. The CSSX process was verified in a series of flowsheet tests at Argonne National Laboratory (ANL) in a minicontactor (2-cm centrifugal contactor) using simulant. The CSSX solvent, which was developed at Oak Ridge National Laboratory (ORNL), consists of a calixarene-crown ether as the extractant, an alkylaryl polyether as the modifier, trioctylamine as the suppressant, and Isopar® L as the diluent. For Cs removal from the SRS tank waste, the key process goals are that: (1) Cs is removed from the waste with a decontamination factor greater than 40,000 and (2) the recovered Cs is concentrated by a factor of 15 in dilute nitric acid. In the flowsheet verification tests, the objectives were to: (1) prove that these process goals could be met; (2) demonstrate that they could be maintained over a period of several days as the CSSX solvent is recycled; and (3) verify that the process goals could still be met after the solvent composition was adjusted. The change in composition eliminated the possibility that the calixarene-crown ether could precipitate from the solvent. The process goals were met for each of the verification tests. The results of these tests, which are summarized here, show that the CSSX process is a very effective way to remove Cs from caustic-side waste.
KW - Caustic-side solvent extraction
KW - Centrifugal contactor
KW - Cesium extraction
KW - Flow-sheet tests
UR - http://www.scopus.com/inward/record.url?scp=0041736694&partnerID=8YFLogxK
U2 - 10.1081/SEI-120022518
DO - 10.1081/SEI-120022518
M3 - Article
AN - SCOPUS:0041736694
SN - 0736-6299
VL - 21
SP - 505
EP - 526
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 4
ER -