scholarly journals Micro-PIXE analysis on adsorbent of extraction chromatography for MA(III) recovery

2016 ◽  
Vol 26 (03n04) ◽  
pp. 73-83
Author(s):  
Y. Takahatake ◽  
S. Watanabe ◽  
H. Kofuji ◽  
M. Takeuchi ◽  
K. Nomura ◽  
...  
Keyword(s):  
Extraction Chromatography ◽  
Packed Column ◽  
Liquid Waste ◽  
Flow Sheet ◽  
Simple Experiment ◽  
High Level Liquid Waste ◽  
Energy Agency ◽  
Pixe Analysis ◽  
Conducting Research ◽  
High Level

Japan Atomic Energy Agency (JAEA) has been conducting research and development of MA(III) recovery from high level liquid waste (HLLW) by extraction chromatography technology for reduction in amount and environmental impact of radioactive waste. The behavior of adsorbed cations inside the adsorbent packed in a column is necessary to be evaluated for improvement of the adsorbent or flow-sheet to achieve targeted MA(III) recovery performance. In this paper, micro-PIXE analysis was carried out on the particles sampled from various positions of the column to reveal the behavior of cations inside the packed column with CMPO/SiO2-P adsorbent using RE(III) as simulated elements of MA(III). Simple experiment and data analysis were shown to be effective to reveal inside of the column, and formation and transportation of the adsorption bands were observed for some cations which are extractable by the CMPO extractant. Some part of Zr(IV) and Mo(VI) were found to remain inside the column without distinct transportation even after the elution operation. Those results will contribute to design more practical MA(III) recovery flow-sheet.

scholarly journals Development of MA separation process with TEHDGA/SiO2-P for an advanced reprocessing

2021 ◽  
Vol 330 (1) ◽  
pp. 237-244
Author(s):  
Yusuke Horiuchi ◽  
Sou Watanabe ◽  
Yuichi Sano ◽  
Masayuki Takeuchi ◽  
Fukuka Kida ◽  
...  
Keyword(s):  
Fission Product ◽  
Distribution Ratio ◽  
Extraction Chromatography ◽  
Packed Column ◽  
Liquid Waste ◽  
Separation Process ◽  
Minor Actinide ◽  
High Level Liquid Waste ◽  
Column Separation ◽  
High Level

AbstractApplicability of tetra2-ehylhexyl diglycolamide (TEHDGA) impregnated adsorbent for minor actinide (MA) recovery from high level liquid waste (HLLW) in extraction chromatography technology was investigated through batch-wise adsorption and column separation experiments. Distribution ratio of representative fission product elements were obtained by the batch-wise experiments, and TEHDGA adsorbent was shown to be preferable to TODGA adsorbent for decontamination of several species. All Ln(III) supplied into the TEHDGA adsorbent packed column was properly eluted from the column, and the applicability of the adsorbent was successfully showed by this study.

Extraction chromatography–electrodeposition (EC–ED) process to recover palladium from high-level liquid waste

2017 ◽  
Vol 28 (12) ◽  
Author(s):  
Qing Zou ◽  
Shuai Gu ◽  
Rui-Qin Liu ◽  
Shun-Yan Ning ◽  
Yan-Liang Chen ◽  
...  
Keyword(s):  
Extraction Chromatography ◽  
Liquid Waste ◽  
High Level Liquid Waste ◽  
High Level

Adsorption Materials Development for the Separation of Actinides and Specific Fission Products from High Level Waste

2014 ◽  
Vol 94 ◽  
pp. 103-110 ◽  
Author(s):  
Yue Zhou Wei ◽  
Shun Yan Ning ◽  
Qi Long Wang ◽  
Zi Chen ◽  
Yan Wu ◽  
...  
Keyword(s):  
Spent Nuclear Fuel ◽  
Selective Adsorption ◽  
Packed Column ◽  
Liquid Waste ◽  
Separation Method ◽  
High Level Waste ◽  
Small Scale ◽  
Fast Diffusion ◽  
High Level Liquid Waste ◽  
High Level

The long-term radiotoxicity of high level liquid waste (HLLW) generated in spent nuclear fuel reprocessing is governed by the content of several long-lived minor actinides (MA) and some specific fission product nuclides. To efficiently separate MA (Am, Cm) and some FPs such as Cs and Sr from the HLLW, we have been studying an advanced aqueous partitioning process, which uses selective adsorption as separation method. In this work, we prepared different types of porous silica-based organic/inorganic adsorbents with fast diffusion kinetics, improved chemical stability and low pressure drop in a packed column. So they are advantageously applicable to efficient separation of the MA and specific FP elements from HLLW. Adsorption and separation behaviors of the MA and some FP elements such as Cs and Sr were studied. Small scale separation tests using simulated and genuine nuclear waste solutions were carried out and the obtained results indicate that the proposed separation method based on selective adsorption is essentially feasible.

Chromatography Column System With Controlled Flow and Temperature for Engineering Scale Application

2009 ◽  
Author(s):  
Sou Watanabe ◽  
Ichiro Goto ◽  
Yuichi Sano ◽  
Yoshikazu Koma
Keyword(s):  
Flow Velocity ◽  
Technology Development ◽  
Liquid Waste ◽  
Test System ◽  
Middle Level ◽  
High Level Liquid Waste ◽  
Energy Agency ◽  
Decay Heat ◽  
Column System ◽  
High Level

Japan Atomic Energy Agency (JAEA) is conducting R&D of the engineering scale extraction chromatography system, which uses silica-based adsorbents impregnated with an extractant for the minor actinides (Am and Cm) recovery from the high level liquid waste generated in the spent FBR fuel reprocessing, as a part of the Fast Reactor Cycle Technology Development (FaCT) project. A bench scale testing system was made and provided for the first step of development. The column of the test system (ID 480 or 200 mmΦ with 650 mm height) was equipped with ports for 6 external sensors at its top, middle and bottom levels for measuring the flow velocity or temperature, and for additional 6 heaters for simulating the decay heat of Am and Cm at the middle level of the column. The flow velocity distribution was almost constant except for the very near at the column wall, and it was almost uniform when the liquid flew from top to bottom direction with 4 cm/min of the velocity. The heaters scarcely influenced on the temperature profile inside the column when the power applied to the heater simulated the decay heat of Am, Cm and FPs. The decay heat generated in the column was transported to the effluents and the temperature inside column was kept almost constant.

APPLICATION OF PIXE TO SEPARATION SCIENCE - TRACE ELEMENT ANALYSIS BY A COMBINED METHOD, ISOTACHOPHORESIS-PIXE -

1993 ◽  
Vol 03 (01) ◽  
pp. 1-29 ◽  
Author(s):  
TAKESHI HIROKAWA ◽  
YOSHIYUKI KISO
Keyword(s):  
Metal Ions ◽  
Trace Element Analysis ◽  
Liquid Waste ◽  
High Sensitivity ◽  
High Level Liquid Waste ◽  
Element Analysis ◽  
Pixe Analysis ◽  
Separation Science ◽  
The Matrix ◽  
High Level

Recent studies were reviewed on the PIXE analysis of metal ions preseparated by means of capillary type isotachophoresis (ITP-PIXE). The principle was described of isotacho-phoresis which was one of electrophoretic methods with high separability and concentration ability. Some applications of ITP-PIXE were demonstrated on the investigation of the separation behavior of metal ions and the analysis of trace elements in a crude rare earth chloride from a monazite and a model mixture of a high level liquid waste. It was revealed that PIXE could be a powerful detection method for the fractions of isotacho-phoresis because of its high sensitivity and multielemental analyzability. Since the matrix effect in X-ray measurement was significantly reduced by such preseparation, the minor elements could be determined accurately.

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