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Nguyen, T. H.*; Le Ba, T.*; Tran, C. T.*; Nguyen, T. T.*; Doan, T. T. T.*; Do, V. K.; Watanabe, Masayuki; Pham, Q. M.*; Hoang, S. T.*; Nguyen, D. V.*; et al.
Hydrometallurgy, 213, p.105933_1 - 105933_11, 2022/08
Times Cited Count：9 Percentile：81.6(Metallurgy & Metallurgical Engineering)A continuous counter-current extraction for the selective recovery of thorium (Th) and uranium (U) from the Yen Phu (Vietnam) rare earth concentrate leach solutions was systematically studied. The primary amine N1923 was used as an extractant which was prepared in the isoparaffin IP-2028 diluent. Thorium and uranium were selectively recovered in a hydrometallurgical circuit established by continuous mixer-settler extraction, scrubbing, and back-extraction at the laboratory scale. The desired purity of Th and U can be achieved by managing the volume ratio of organic to aqueous phase (O/A ratio) in the corresponding steps. Highly pure Th and U were recovered from the pregnant back-extraction liquor and the raffinate, respectively, which have satisfactory properties for further processing of the subsequent nuclear materials.
irradiationHiroki, Akihiro; Tran, H. T.*; Nagasawa, Naotsugu; Yagi, Toshiaki*; Tamada, Masao
Radiation Physics and Chemistry, 78(12), p.1076 - 1080, 2009/12
Times Cited Count：58 Percentile：96.38(Chemistry, Physical)To investigate an adsorption of Pb and Au ions, blend hydrogels based on the carboxymethyl cellulose (CMC) and carboxymethyl chitosan (CMCts) were prepared by -irradiation of a high concentrated CMC/CMCts aqueous solution. The blend hydrogels showed a degree of swelling in the range of 30 to about 550 g -water/g -dried gel. The gel fraction of the blend hydrogels increased sharply up to 30 kGy and reached a constant value in the range of 100-200 kGy. The gel fraction of the blend hydrogel decreased with increasing the ratio of CMCts. Nitrogen content in the hydrogels was determined by means of elemental analysis. The nitrogen content in the obtained hydrogels was proportional to the ratio of CMCts in the mixture, which was almost equal with theoretical ones. This is indicated that the obtained hydrogels were constructed at the initial ratio of CMC/CMCts. The rate of the metal ions adsorbed to the blend hydrogels increased with increasing the composition of CMCts. In the case of Pb, the CMC/CMCts blend gels showed the enhancement of the adsorption rate in the range of 55% to 80%. Although the adsorption rate of Au ions was only 10% at CMC/CMCts 100/0, it reached at 60% at 75/25, and then increased up to about 90% at 0/100. The obtained blend hydrogels had high adsorption performance which was controlled by adjusting the composition of CMC/CMCts.
Kobayashi, Noriyuki; Bigelow, T.*; Bonicelli, T.*; Cirant, S.*; Denisov, G.*; Heidinger, R.*; Henderson, M.*; Hogge, J.-P.*; Piosczyk, B.*; Ramponi, G.*; et al.
AIP Conference Proceedings 933, p.413 - 416, 2007/10
Since the EDA 2001, Design of Electron Cyclotron Heating and Current Drive (ECH&CD) System have been modified due to progress of physics understanding and change of interface. Nominal RF power 20 MW is injected by four upper launchers or one equatorial launcher. RF beams are steered by a front steering mirror. DCHV power supply will be composed of IGBT pulse step modulators because of high frequency modulation and design flexibility to three different types of 170 GHz gyrotrons from three parties. The RF power is transmitted by 63.5 mm dia corrugated waveguide and switched by a waveguide switch between the upper launcher and the equatorial launcher. A start-up system for initial discharge is composed of three 127.5 GHz gyrotrons and dedicated DCHV power supply. Three of transmission lines are shared between 170 GHz and 127.5 GHz gyrotrons to inject start-up RF beam through the equatorial launcher. R&Ds for high power long pulse have been on-going to obtain a reliable ITER ECH&CD system.
Hiroki, Akihiro; Nagasawa, Naotsugu; Yagi, Toshiaki; Tamada, Masao; Tran, H. T.*
no journal, ,
no abstracts in English
Onoda, Shinobu; Abe, Hiroshi; Yamamoto, Takashi; Oshima, Takeshi; Taniguchi, Takashi*; Teraji, Tokuyuki*; Siyushev, P.*; Tran, T. H.*; Yang, S.*; Fedder, H.*; et al.
no journal, ,
no abstracts in English
