scholarly journals Evaluation of an alkaline-side solvent extraction process for cesium removal from SRS tank waste using laboratory-scale centrifugal contactors

1999 ◽  
Author(s):  
R. A. Leonard ◽  
C. Conner ◽  
M. W. Liberatore ◽  
J. Sedlet ◽  
S. B. Aase ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Process ◽  
Laboratory Scale ◽  
Cesium Removal ◽  
Alkaline Side ◽  
Centrifugal Contactors ◽  
Tank Waste

scholarly journals DEVELOPING AND TESTING AN ALKALINE-SIDE SOLVENT EXTRACTION PROCESS FOR TECHNETIUM SEPARATION FROM TANK WASTE

1999 ◽  
Vol 34 (6-7) ◽  
pp. 1043-1068 ◽  
Author(s):  
Ralph A. Leonard ◽  
Cliff Conner ◽  
Matthew W. Liberatore ◽  
Peter V. Bonnesen ◽  
Derek J. Presley ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Process ◽  
Alkaline Side ◽  
Tank Waste

DEVELOPMENT OF A SOLVENT EXTRACTION PROCESS FOR CESIUM REMOVAL FROM SRS TANK WASTE

2001 ◽  
Vol 36 (5-6) ◽  
pp. 743-766 ◽  
Author(s):  
Ralph A. Leonard ◽  
Cliff Conner ◽  
Matthew W. Liberatore ◽  
Jake Sedlet ◽  
Scott B. Aase ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Process ◽  
Cesium Removal ◽  
Tank Waste

scholarly journals DEVELOPING AND TESTING AN ALKALINE-SIDE SOLVENT EXTRACTION PROCESS FOR TECHNETIUM SEPARATION FROM TANK WASTE

1999 ◽  
Vol 34 (6&7) ◽  
pp. 1043-1068 ◽  
Author(s):  
Ralph Leonard ◽  
Cliff Conner ◽  
Matthew Liberatore ◽  
Peter Bonnesen ◽  
Derek Presley ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Process ◽  
Alkaline Side ◽  
Tank Waste

Centrifugal Contactors for Laboratory-Scale Solvent Extraction Tests

1997 ◽  
Vol 32 (1-4) ◽  
pp. 193-210 ◽  
Author(s):  
Ralph A. Leonard ◽  
David B. Chamberlain ◽  
Cliff Conner
Keyword(s):  
Solvent Extraction ◽  
Laboratory Scale ◽  
Centrifugal Contactors

Proof-of-Concept Flowsheet Tests for Cesium Removal from Tank Waste by Caustic-Side Solvent Extraction

2002 ◽  
Vol 713 ◽  
Author(s):  
David B. Chamberlain ◽  
Scott Aase ◽  
Hassan A. Arafat ◽  
Cliff Conner ◽  
Ralph A. Leonard ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Decontamination Factor ◽  
High Level Waste ◽  
Savannah River ◽  
Alkyl Aryl ◽  
Oak Ridge ◽  
Cesium Removal ◽  
Tank Waste

ABSTRACTA caustic-side solvent extraction (CSSX) process to remove cesium from Savannah River Site (SRS) high-level waste has been developed through a joint program with Oak Ridge National Laboratory (ORNL), the Savannah River Technical Center (SRTC), and Argonne National Laboratory (ANL). The CSSX solvent consists of four components: (1) an extractant, a calixarene crown, calix[4]arene-bis(tert-octylbenzo-crown-6) designated BOBCalixC6, (2) a modifier, an alkyl aryl polyether, 1-(2,2,3,3,-tetrafluoropropoxy)-3-(4-sec-butylphenoxy)-2-propanol, also called Cs-7SB, (3) a suppressant, an alkyl amine, trioctylamine (TOA), and (4) a diluent, Isopar®L. The solvent composition is 0.01 M BOBCalixC6, 0.50 M Cs-7SB, and 0.001 M TOA in Isopar®L. In this program we have developed and demonstrated a flowsheet that can be used to process SRS tank waste. To this end, a series of flowsheet tests were completed using simulated waste in a 2-cm centrifugal contactor at ANL. Three short-term (3-4 hours) tests were completed to demonstrate various aspects of the flowsheet. These tests were followed by a 71-h test where the solvent was recycled 42 times. In each case, we met or exceeded the key process goals: (1) cesium removal from the waste with a decontamination factor greater than 40,000, (2) concentration of cesium in the aqueous strip effluent by a factor of 15 using dilute nitric acid, and (3) stripping the solvent sufficiently to allow it to be recycled many times. The results from the 71-h test are discussed.

Development and testing of a cobalt dicarbollide based solvent extraction process for the separation of cesium and strontium from acidic tank waste

2002 ◽  
Vol 37 (8) ◽  
pp. 1807-1831 ◽  
Author(s):  
R. S. Herbst ◽  
J. D. Law ◽  
T. A. Todd ◽  
V. N. Romanovskii ◽  
V. A. Babain ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Extraction Process ◽  
Tank Waste

scholarly journals Multi-day test of the caustic-side solvent extraction flowsheet for cesium removal from a simulated SRS tank waste.

2002 ◽  
Author(s):  
R A Leonard ◽  
S B Aase ◽  
H A Arafat ◽  
D B Chamberlain ◽  
C Conner ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Cesium Removal ◽  
Tank Waste

Design of a solvent extraction process for PAH-contaminated sediments: the wau-acetone process

1998 ◽  
Vol 37 (6-7) ◽  
pp. 411-418 ◽  
Author(s):  
W. H. Rulkens ◽  
H. Bruning ◽  
H. J. van Hasselt ◽  
J. Rienks ◽  
H. J. van Veen ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Process Design ◽  
Dry Matter ◽  
Distillation Column ◽  
Extraction Process ◽  
Laboratory Scale ◽  
Main Process ◽  
High Concentration ◽  
Clay Particles ◽  
Treatment Step

Solvent extraction is one of the possibilities to clean-up polluted sediments. It is especially attractive when the sediment mainly consists of clay particles polluted with contaminants which are not, or not easily, biodegradable. Using acetone as extracting agent the extraction process has been investigated at laboratory scale for treating sediment of the Petroleum Harbour in Amsterdam. This sediment is characterised by a substantial percentage of particles with diameter <63 μm, a high percentage of organic matter (about 12% on dry matter basis), a high concentration of PAH (500-2,000 mg total EPA-PAH per kg dry matter) and a high concentration of mineral oil (6,000–10,000 mg/kg dry matter). Based on the laboratory scale experiments a process design has been made of a complete solvent-extraction process with acetone. The main process steps in this design consist of a countercurrent flow extractor, a separator for the sediment, a post-treatment step to remove residual acetone from the sediment, a distillation column to recover the acetone for reuse and to concentrate the pollutants and a polishing step for the water to be discharged. The sediment treatment costs with this system are estimated at 115 NGL per tonne dry matter to be treated.

scholarly journals Study on the Effect and Mechanism of Impurity Aluminum on the Solvent Extraction of Rare Earth Elements (Nd, Pr, La) by P204-P350 in Chloride Solution

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 61
Author(s):  
Wenjie Zhang ◽  
Xian Xie ◽  
Xiong Tong ◽  
Yunpeng Du ◽  
Qiang Song ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solvent Extraction ◽  
Rare Earth Elements ◽  
Organic Phase ◽  
Extraction Process ◽  
Industrial Applications ◽  
Separation And Purification ◽  
Aluminum Ion ◽  
Hydrochloric Acid Medium ◽  
Impurity Ion

Solvent extraction is the most widely used method for separation and purification of rare earth elements, and organic extractants such as di(2-ethylhexyl) phosphoric acid (P204) and di(1-methyl-heptyl) methyl phosphonate (P350) are most commonly used for industrial applications. However, the presence of impurity ions in the feed liquid during extraction can easily emulsify the extractant and affect the quality of rare earth products. Aluminum ion is the most common impurity ion in the feed liquid, and it is an important cause of emulsification of the extractant. In this study, the influence of aluminum ion was investigated on the extraction of light rare earth elements by the P204-P350 system in hydrochloric acid medium. The results show that Al3+ competes with light rare earths in the extraction process, reducing the overall extraction rate. In addition, the Al3+ stripping rate is low and there is continuous accumulation of Al3+ in the organic phase during the stripping process, affecting the extraction efficiency and even causing emulsification. The slope method and infrared detection were utilized to explore the formation of an extraction compound of Al3+ and the extractant P204-P350 that entered the organic phase as AlCl[(HA)2]2P350(o).

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