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Journal Articles

Selective recovery of thorium and uranium from leach solutions of rare earth concentrates in continuous solvent extraction mode with primary amine N1923

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

https://doi.org/10.1016/j.hydromet.2022.105933

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.

Journal Articles

Crystal structure of U $_{1-y}$ Ln $_{y}$ O $_{2-x}$ (Ln = Gd, Er) solid solution

Pham, V. M.*; Arima, Tatsumi*; Inagaki, Yaohiro*; Idemitsu, Kazuya*; Akiyama, Daisuke*; Nagai, Takayuki; Okamoto, Yoshihiro

Journal of Nuclear Materials, 556, p.153189_1 - 153189_9, 2021/12

https://doi.org/10.1016/j.jnucmat.2021.153189

Times Cited Count：1 Percentile：15.7(Materials Science, Multidisciplinary)

The crystal structure change was evaluated for (1-x)UO $_{2}$ -xLnO $_{1.5}$ (Ln=Gd or Er; x = 0 to 0.4) samples sintered at 1973 K for 8 h under Ar and Ar-10%H $_{2}$ atmospheres. The effect of LnO $_{1.5}$ doping on the crystal structure of UO $_{2}$ was investigated by X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS). LnO $_{1.5}$ doping into UO $_{2}$ reduced the lattice parameter of UO $_{2}$ -LnO $_{1.5}$ solid solutions up to 40mol% LnO $_{1.5}$ . The lattice parameters of these samples were comparable to those of stoichiometric (U,Ln)O $_{2.00}$ solid solutions, that is, the O/M ratios were close to 2.00. The U L $_{3}$ -edge XANES analysis showed that higher U oxidation states of +5 or +6 formed, in addition to + 4. The EXAFS analysis indicated that the interatomic distances of U-O and Gd-O decreased with increasing x, whereas those of Er-O may not decrease monotonically.

Journal Articles

Steam oxidation of silicon carbide at high temperatures for the application as accident tolerant fuel cladding, an overview

Pham, V. H.; Kurata, Masaki; Steinbrueck, M.*

Thermo (Internet), 1(2), p.151 - 167, 2021/09

https://doi.org/10.3390/thermo1020011

Journal Articles

Certified reference material IAEA-418; $^{129}$ I in mediterranean sea water

Pham, M. K.*; Betti, M.*; Povinec, P. P.*; Alfimov, V.*; Biddulph, D.*; Gastaud, J.*; Kieser, W. E.*; Lpez, Gutirrez, J. M.*; Possnert, G.*; Sanchez-Cabeza, J. A.*; et al.