Preparation of high purity uranium metal from aqueous solutions

Preparation of praseodymium metal by hydrometallurgy

“…Oxygen, nitrogen and carbon contents in the praseodymium metals by hydrometallurgy are almost similar to those of the commercial ones prepared by pyrometallurgy. And they were 10 1 -10 2 times of those in uranium metal prepared by the same hydrometallurgy method as well as those of lanthanum and cerium metals [4][5][6]. It appears to be due to a difference in affinity of the metals for them.…”

“…It has been shown, however, that uranium and neptunium metals have been successfully prepared by the controlled current electrolysis in aqueous solutions using a mercury electrode followed by thermal decomposition of the amalgams [4,5]. Moreover, the purity of uranium metals was found to be more than 99.99% and the contents of oxygen and nitrogen were below 10 and 5 ppm, respectively.…”

Itinerant 5f electrons and the Fermi surface properties in neptunium compounds

“…The starting material of a Np metal was prepared by the electrolysis of an aqueous solution of NpO 2 [12]. Highquality single crystals of NpGe 3 , NpIn 3 , NpCoGa 5 , NpRhGa 5 and NpFe 4 P 12 were grown by the flux method [10].…”

Crystal Structure and Physical Properties of Trigonal NpGa3and Np3Ga11

“…The starting material of Np metal was prepared by the Hg-amalgamation process and subsequent decomposition at high temperature. 6) Np metal was put into an alumina crucible with metallic Ga in an atomic ratio 1:20. It was then sealed with argon gas in a quartz tube.…”