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Myochin, Munetaka; Kosugi, Kazumasa; Wada, Yukio; Yamada, Kazuo; Seimiya, Hiroshi; Ishikawa, Hirohisa
PNC TN8410 96-071, 86 Pages, 1996/03
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PNC TN8410 93-006, 38 Pages, 1992/12
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.
; ; Kawata, Tomio
PNC TN8410 92-153, 16 Pages, 1992/05
Platinum group metals (palladium, rhodium, ruthenium) and technetium are key nuclides which dominate the overall decontamination factors of the Purex Process. They are also precious metals which can be potential resources in the future. Electrolytic deposition (or extraction) is likely to separate and recover such metals from Purex process solutions. Potentiostatic investigation for platinum group metals were carried out to identify the deposition starting potential and deposition velocity in nitric acid condition. As the results, it was found that there was an optimum deposition potential specific to each platinum elements. Palladium tended to deposit on the cathode electrode surface from modified HLLW with high efficiency even in the high acid concentration.
