Hot test of partitioning strontium from high-level liquid waste (HLLW) by dicyclohexano-18crown-6 (DCH18C6)

2001 ◽  
Vol 89 (3) ◽  
Author(s):  
W. Jianchen ◽  
S. Chongli
Keyword(s):  
Crown Ether ◽  
Liquid Waste ◽  
Current Mode ◽  
Feed Solution ◽  
High Level Liquid Waste ◽  
Trpo Process ◽  
Centrifugal Contactor ◽  
High Level ◽  
Counter Current ◽  
Hot Test

The crown ether strontium extraction(CESE) process for partitioning strontium from HLLW was studied. A hot test was carried out in a counter current mode with genuine HLLW by using a miniature centrifugal contactor set. 0.1 mol/L DCH18C6 in 1-octanol was used as extractant. The feed solution was the HLLW raffinate of TRPO process after removing TRU elements. Acidity of the feed was 1.45 mol/L HNO

Partitioning of minor actinides from HLLW using the DIAMEX process.Part 1 - Demonstration of extraction performances and hydraulic behaviour of the solvent in a continuous process

2000 ◽  
Vol 88 (12) ◽  
Author(s):  
O. Courson ◽  
M. Lebrun ◽  
R. Malmbeck ◽  
G. Pagliosa ◽  
K. Römer ◽  
...  
Keyword(s):  
Continuous Process ◽  
Liquid Waste ◽  
Feed Solution ◽  
Purex Process ◽  
Minor Actinides ◽  
High Level Liquid Waste ◽  
Hydraulic Behaviour ◽  
High Level ◽  
Counter Current ◽  
Back Extract

The French DIAMEX process shows very promising capabilities in separating minor actinides from HLLW. A counter-current centrifugal extractor experiment has been conducted to investigate the capabilities and possibilities of the DIAMEX process (hydraulic and extraction behaviour), for the separation of lanthanides from a simulated High Level Liquid Waste (HLLW), corresponding in concentration to a raffinate from the PUREX process.A ´´hot´´ batch test, using genuine HLLW, and a continuous counter-current experiment have verified the excellent extraction and hydraulic behaviour, respectively.With only four extraction stages in the cold experiment, lanthanide decontamination factors were higher than 2000, except for europium. Co-extraction of molybdenum and zirconium was efficiently prevented using oxalic acid in the feed solution. The back-extraction was very efficient, yielding in 4 stages more than 99% recovery of lanthanides. Palladium and ruthenium were more difficult to back-extract and for these elements further investigations are needed.

Agents and Processes Design for TRU Elements Back Extraction in TRPO Process

2009 ◽  
Author(s):  
Meng Wei ◽  
Xuegang Liu ◽  
Jing Chen
Keyword(s):  
Organic Phase ◽  
Liquid Waste ◽  
Back Extraction ◽  
High Level Liquid Waste ◽  
Trpo Process ◽  
Extraction Processes ◽  
Treatment And Disposal ◽  
High Level ◽  
Disposal Cost

To reduce the long-term risk of the high-level liquid waste (HLLW) and the waste disposal cost, transuranium (TRU) elements should be removed from HLLW. A so-called TRPO process has been developed by Chinese scientists to partition HLLW. In this process, the extractant, trialkyl phosphine oxide (TRPO), is able to extract TRU elements into organic phase completely, which makes the treatment and disposal of raffinate HLLW much easier. However, the treatment of extracted TRU elements in organic phase, in return, becomes new troublesome issue. Generally, there are three promising ways to treat the extracted TRU elements: (1)transmutation; (2)conditioning; (3)recycling U+Pu in Purex-TRPO Integrated Process. In any of the three ways, the back extraction agents and processes play significant roles. In this paper, the investigations on back extraction agents for TRU elements, such as TTHA, DTPA, AHA, HEDPA, DOGA, and carbonates are introduced. The corresponding back extraction processes and experimental results are reviewed.

Application of annular centrifugal contactors in the hot test of the improved total partitioning process for high level liquid waste

2014 ◽  
Vol 278 ◽  
pp. 566-571 ◽  
Author(s):  
Wuhua Duan ◽  
Jing Chen ◽  
Jianchen Wang ◽  
Shuwei Wang ◽  
Xiaogui Feng ◽  
...  
Keyword(s):  
Liquid Waste ◽  
High Level Liquid Waste ◽  
High Level ◽  
Centrifugal Contactors ◽  
Hot Test

Denitration of simulated high-level liquid waste by formic acid for the connection of PUREX process with TRPO process

2017 ◽  
Vol 314 (1) ◽  
pp. 221-229 ◽  
Author(s):  
Wenbing Li ◽  
Wuhua Duan ◽  
Taoxiang Sun ◽  
Changjian Liu ◽  
Jianchen Wang ◽  
...  
Keyword(s):  
Formic Acid ◽  
Liquid Waste ◽  
Purex Process ◽  
High Level Liquid Waste ◽  
Trpo Process ◽  
High Level

scholarly journals Development of a test system for high level liquid waste partitioning

2015 ◽  
Vol 30 (4) ◽  
pp. 311-317
Author(s):  
Wu Duan ◽  
Jing Chen ◽  
Jian Wang ◽  
Shu Wang ◽  
Xing Wang
Keyword(s):  
Liquid Waste ◽  
Video Camera ◽  
Extraction Process ◽  
Test System ◽  
High Level Liquid Waste ◽  
Sampling System ◽  
System A ◽  
Treatment And Disposal ◽  
High Level ◽  
Hot Test

The partitioning and transmutation strategy has increasingly attracted interest for the safe treatment and disposal of high level liquid waste, in which the partitioning of high level liquid waste is one of the critical technical issues. An improved total partitioning process, including a tri-alkylphosphine oxide process for the removal of actinides, a crown ether strontium extraction process for the removal of strontium, and a calixcrown ether cesium extraction process for the removal of cesium, has been developed to treat Chinese high level liquid waste. A test system containing 72-stage 10-mm-diam annular centrifugal contactors, a remote sampling system, a rotor speed acquisition-monitoring system, a feeding system, and a video camera-surveillance system was successfully developed to carry out the hot test for verifying the improved total partitioning process. The test system has been successfully used in a 160 hour hot test using genuine high level liquid waste. During the hot test, the test system was stable, which demonstrated it was reliable for the hot test of the high level liquid waste partitioning.

Partitioning of minor actinides from HLLW using the DIAMEX process.Part 2 - ´´Hot´´ continuous counter-current experiment

2000 ◽  
Vol 88 (12) ◽  
Author(s):  
R. Malmbeck ◽  
O. Courson ◽  
G. Pagliosa ◽  
K. Römer ◽  
B. Sätmark ◽  
...  
Keyword(s):  
World Wide ◽  
Process Development ◽  
Liquid Waste ◽  
Extraction Process ◽  
Purex Process ◽  
Minor Actinides ◽  
Current Experiment ◽  
High Level Liquid Waste ◽  
High Level ◽  
Counter Current

Among several processes proposed world-wide, the French DIAMEX (DIAMide EXtraction) process seems to be very efficient for the removal of Minor Actinides (MA) from genuine High Level Liquid Waste (HLLW). The MA are in this process directly extracted from the PUREX (Plutonium Uranium Redox EXtraction) raffinate together with fission lanthanides using the completely combustible diamide extractant. In this work a hot demonstration of the DIAMEX process using genuine high-level PUREX raffinate is reported. The continuous counter-current experiment was carried out in a 16 stage centrifugal extractor battery, installed in a hot cell. In order to produce a representative HLLW a PUREX process was applied on dissolved fuel using the same equipment. In the DIAMEX process up to 6 extraction stages were sufficient to achieve feed decontamination factors between 100 and 230 for lanthanides and above 300 for minor actinides. Co-extraction of molybdenum and zirconium were efficiently prevented using oxalic acid scrubbing. The back extraction proved to be very efficient, yielding in 4 stages more than 99.9% recovery of both the lanthanides and the actinides. Co-extracted ruthenium, technetium, palladium and neptunium are less efficiently back-extracted requiring further process development.

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