Ways of technetium and neptunium localization in extraction reprocessing of spent nuclear fuel from nuclear power plants

Голецкий, Н. Д.; Zilberman, B. Ya.; Fedorov, Yu. S.; Кудинов, А. С.; Timoshuk, A. A.; Sytnik, L. V.; Пузиков, Е. А.; Родионов, С. А.; Krinitsyn, A. P.; Ryazantsev, V I; Ryabkov, D. V.

doi:10.1134/s1066362214050099

Cited by 15 publications

(2 citation statements)

References 29 publications

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“…Within the framework of this flowsheet, it is possible to obtain U and Pu strips, as well as their master mixtures (with Np or without it). The flowsheet was tested on a rig of mixer-settlers at the Scientific and Experimental Complex of the Radium Institute for UREA DERIVATIVES reprocessing of WWER-1000 fuel with the burn-up of up to 70 GW day (t U) -1 [81][82][83].…”

Section: Hydroxamic Acidsmentioning

confidence: 99%

Organic reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing

Marchenko

Alekseenko²,

Dvoeglazov

2015

Radiochemistry

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Scientific, technical, and patent information on the use of organic compounds as reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing is summarized and correlated. Organic derivatives of hydrazine and hydroxylamine, and also oximes and urea derivatives at relatively low acidities and temperatures reduce Np(VI) to Np(V) and Pu(IV) to Pu(III). As the acidity and temperature are increased, Np(V) is slowly reduced to Np(IV). Alcohols, aldehydes, hydrocarbons, and acetic acid were identified among products of oxidation of the organic compounds in nitric acid medium. The above-named organic reductants can be used in different steps of the PUREX process: separation of Pu and Np from U in the first extraction cycle, purification of U to remove Np in the second cycle of uranium purification, and Pu stripping in the step of its final purification. Laboratory experiments performed on countercurrent extraction installations of mixersettlers and of centrifugal contactors demonstrated the possibility of reaching high separation factors of U from Pu and/or Np and high degrees of plutonium concentration to obtain Pu strips containing up to 150 g L -1 Pu.

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Section: Hydroxamic Acidsmentioning

confidence: 99%

Organic reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing

Marchenko

Alekseenko²,

Dvoeglazov

2015

Radiochemistry

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“…Several modifications of the PUREX process have been proposed in which parameters such as HNO 3 concentration, metal ion (U, Pu, Np, and Tc) concentrations, and nature of the reducing agent can vary. For example, the solution composition of the single-cycle flowsheet for the UNF reprocessing from the WWER-440 reactor using N 2 H 4 as the reducing agent is presented in Table …”

Section: Introductionmentioning

confidence: 99%

Structural Investigation of Technetium Dibutylphosphate Species Using X-ray Absorption Fine Structure Spectroscopy

George,

Salcedo,

Greenberg

et al. 2023

Inorg. Chem.

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Reaction of Pertechnetate in Highly Alkaline Solution: Synthesis and Characterization of the Nitridotrioxotechnetate Ba[TcO₃N]

Badea

Dardenne

Polly

et al. 2022

Chemistry A European J

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The preparation of novel technetium oxides, their characterization and the general investigation of technetium chemistry are of significant importance, since fundamental research has so far mainly focused on the group homologues. Whereas the structure chemistry of technetium in strongly oxidizing media is dominated by the TcO 4 ½ � À anion, our recent investigation yielded the new TcO 3 N ½ � 2À anion. Brown single crystals of Ba[TcO 3 N] were obtained under hydrothermal conditions starting from Ba(OH) 2 • 8H 2 O and NH 4 [TcO 4 ] at 200 °C. Ba½TcO 3 N� crystallizes in the monoclinic crystal system with the space group P2 1 /n (a = 7.2159(4) Å, b = 7.8536(5) Å, c = 7.4931(4) Å and β = 104.279(2)°). The crystal structure of Ba½TcO 3 N� consists of isolated TcO 3 N ½ � 2À tetrahedra, which are surrounded by Ba 2 + cations. XANES measurements complement the oxidation state + VII for technetium and Raman spectroscopic experiments on Ba[TcO 3 N] single crystals exhibit characteristic TcÀ O and TcÀ N vibrational modes.

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Ways of technetium and neptunium localization in extraction reprocessing of spent nuclear fuel from nuclear power plants

Cited by 15 publications

References 29 publications

Organic reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing

Organic reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing

Structural Investigation of Technetium Dibutylphosphate Species Using X-ray Absorption Fine Structure Spectroscopy

Reaction of Pertechnetate in Highly Alkaline Solution: Synthesis and Characterization of the Nitridotrioxotechnetate Ba[TcO₃N]

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Ways of technetium and neptunium localization in extraction reprocessing of spent nuclear fuel from nuclear power plants

Cited by 15 publications

References 29 publications

Organic reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing

Organic reductants of Pu and Np ions in wet technology for spent nuclear fuel reprocessing

Structural Investigation of Technetium Dibutylphosphate Species Using X-ray Absorption Fine Structure Spectroscopy

Reaction of Pertechnetate in Highly Alkaline Solution: Synthesis and Characterization of the Nitridotrioxotechnetate Ba[TcO3N]

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Product

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About

Reaction of Pertechnetate in Highly Alkaline Solution: Synthesis and Characterization of the Nitridotrioxotechnetate Ba[TcO₃N]