Recovery of alkali salt by supercritical fluid leaching method using carbon dioxide

Watanabe, Takeshi*; Tsushima, Satoru*; Yamamoto, Ichiro*; Tomioka, Osamu; Meguro, Yoshihiro; Nakashima, Mikio; Wada, Ryutaro*; Nagase, Yoshiyuki*; Fukuzato, Ryuichi*

Proceedings of 2nd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications (Super Green 2003), p.363 - 366, 2004/00

Recovery of salts by supercritical fluid leaching (SFL) method using carbon dioxide was experimentally studied. It was confirmed that LiCl was recovered with a mixed fluid of carbon dioxide and methanol, and KCl and SrCl were recovered with a mixed fluid of carbon dioxide, methanol and crown ether. The influence of crown ether for KCl and SrCl extraction were found to increase in the order of 15-crown-5 (15C5) 18-crown-6 (18C6) dicychlohexyl-18-crown-6 (DC18C6). It is expected that other salts can be recovered selectively with a mixed fluid of carbon dioxide, methanol and suitable crown ether.

Advanced recycle technology based on electrorefining of nitride fuel

Arai, Yasuo

Saishin Kaku Nenryo Kogaku; Kodoka No Genjo To Tembo, p.451 - 457, 2001/06

no abstracts in English

Study on cathodic reaction control efficiency by low alloy steels

Akashi, Masatsune*; Fukaya, Yuichi*; Asano, Hidekazu*

JNC TJ8400 2000-015, 46 Pages, 2000/02

JNC-TJ8400-2000-015.pdf:2.96MB

Difference of hydrogen generation phenomena on the surface of the Steels were not observed between carbon steel, atmospheric corrosion resisting steel and 5%-Ni steel. Rust layer was formed on these three-type of steels by steam oxidation method. And the chemical composition of the rust for the steels were basically two (2) layers structure for the previous two steels as hematite (FeO) based for the outer layer and magnetite (FeO) based for the inner layer. And for the last steel, it had three (3) layer in the rust as hematite (FeO) based for the outer layer, magnetite (FeO) based for the intermediate layer and Ni based layer for the inner layer. These steels showed mostly same Tafel gradient in their cathodic polarization curves compare with that for no rust specimens. However, the exchange current density which reaction is assumed as a hydrogen generation reaction was largely increased. The cathodic reaction for each steels whose surface is covered by magnetite layer might be accelerated, then the corrosion rate was considered as accelerated, too.

None

Shibata, Toshio*; *; *; Tsuru, Toru*; Inoue, Hiroyuki*

JNC TJ8400 2000-013, 38 Pages, 2000/02

JNC-TJ8400-2000-013.pdf:3.25MB

None

Acceleration experiment of hydrogen negative ion beams up to 1MeV using multi-aperture multi-stage electrostatic accelerator

Fujiwara, Yukio; Hanada, Masaya; Kashiwagi, Mieko; Kitagawa, Tadashi*; Miyamoto, Kenji; Morishita, Takatoshi; Okumura, Yoshikazu; Takayanagi, Tomohiro; Taniguchi, Masaki; Watanabe, Kazuhiro

Dai-10-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu Hobunshu, p.87 - 92, 1999/00

no abstracts in English

None

PNC TJ1150 98-002, 89 Pages, 1998/02

PNC-TJ1150-98-002.pdf:9.43MB

None

Investigation of pyrometallurgical partitioning and extracting technology of irradiated fuel

Yumoto, Ryozo*; Yokochi, Yoji*; Koizumi, Masumichi*; Seki, Sadao*

PNC TJ9409 96-002, 93 Pages, 1996/03

PNC-TJ9409-96-002.pdf:2.64MB

The state of development of pyrometallurgical partitioning and extracting technology of irradiated fuel is investigated. Also in case of perfoming the test at O-arai engineering center, the contents of the test, equipments, structure and arragement of cells that equipments are installed, are studied. The purpose of the test is to confirm the realization of the process and behavior of FP and TRU elements, and off-gass that cannot be made dear by cold test. In this study it is assumed that 100g monju fuel (94,000MWd/t B.U, cooled for 550 days) per batch is treated. Four processes are picked up except for pin sectioning and powdering, as important subjects. They are as follows. (1)reduction of oxide fuel (2)electrorefining (3)cathode processing (4)extraction of TRU elements. And the outline of the test, blocked flow chart and the outline of equipment are clarified. And the outline of chart is drawn. Moreover, the specification of analitical equipments which are necessary to analyze the product is shown. From spent chloride, TRU and a part of FP elements are extracted and they are recycled for electrorefining and so on. The salt-waste including residual FP elements is kept in a receptacle after being absorbed into Zeorite and soldified. As the disposition of these tests, modified test cell in the existing FMF, modified concrete cell in AGF, new cell at B2F in the existing FMF and new cell at second auxiliary room in FMF extension are studied. As result of considering the disposition for equipment, the difficulty of reconstucting new cell including of equipments, method of mentenance, and equipments of ventilazion (Ar circumstance) including of management of off gas, and the plan of disposition, it is concluded that constructing iron cell into the second auxiliary room of FMF extension is best, because it is easy to construct safely, and the occurance of radioactive waste and the influence to other tests is little, and it is possible to examine more efficiently.

Outgassing from the spindt-type cold cathode electron source

Ogiwara, Norio; *

Shinku, 36(3), p.325 - 327, 1993/00

https://doi.org/10.3131/jvsj.36.325

no abstracts in English

Electrolytic Extraction of platinum group metals from Purex process solutions.(2)

; ;

PNC TN8410 93-006, 38 Pages, 1992/12

PNC-TN8410-93-006.pdf:0.7MB

Elimination of the ionic platinum group metals (palladium, rhodium, ruthenium) and technetium from dissolver solution seems to be an effective method to improve the stability, reliability and operability of the extraction process in spent nuclear fuel reprocessing. Some fundamental experiments were conducted for the purpose of establishing this new method. A method of electrolytic extraction to separate and recover such metals from Purex process solutions was investigated. Potentiostatic investigations of platinum group metals were carried out to identify deposition starting potential and rate in a nitric acid condition. As the results, it was found that the deposition rate depended on the electrode material, temperature, nitric acid concentration and coexistence ions. The deposition rate were found to be related to the polalization potential, and the optimum deposition potential was specified for each of platinum group metals.

Characteristics of spindt-type cold cathode

Ogiwara, Norio; ; *; Sakamoto, Keishi; ; *; Ishizuka, H.*

Shinku, 35(3), p.392 - 394, 1992/00

https://doi.org/10.3131/jvsj.35.392

no abstracts in English