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Shatalov, V. V.; Seregin, M. B.; Kharin, V. F.; Ponomarev, L.A.

doi:10.1023/a:1011376412282

Cited by 20 publications

(4 citation statements)

References 2 publications

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“…4a shows an expanded view of the DTA curve to either side of the UF 6 production event. The oscillations of the sample pan reflect the coupling of two small thermal signatures, marked (1) and (3), to either side of the major thermal release of UF 6 , marked (2). A uranium oxyfluoride had likely formed on the low-temperature side, and the decrease in the mass gradient toward the high-temperature side, marked (3) in Fig.…”

Section: Nf 3 Fluorination Of Uomentioning

confidence: 91%

“…The reaction with NF 3 is listed in Table 1: Eqs. (1) and (2). The general observation is that UO 2 F 2 is formed preferentially to UF 6 unless the sample heating rate or reaction heat forces a rapid increase in temperature that drives production of UF 6 .…”

Section: Nf 3 Fluorination Of Uomentioning

confidence: 99%

“…Fluorination technologies have been used historically to enrich 235 U from various uranium feedstocks by gaseous diffusion [1][2][3] and have been discussed for nuclear fuels recycle [4][5][6], nuclear materials separations [7], purification [1,8], and US Department of Energy (DOE) site decontamination [9,10]. With respect to nuclear materials separations, the hexafluorides of U, Pu, and Np can be separated from complex matrices and each other by their volatility and the physical properties (boiling point, sublimation point) of the gaseous products.…”

Section: Introductionmentioning

confidence: 99%

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Thermal reactions of uranium metal, UO2, U3O8, UF4, and UO2F2 with NF3 to produce UF6

McNamara

Scheele

Kozelisky

et al. 2009

Journal of Nuclear Materials

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a b s t r a c tThis paper demonstrates that NF 3 fluorinates uranium metal, UO 2 , UF 4 , UO 3 , U 3 O 8 , and UO 2 F 2 Á2H 2 O to produce the volatile UF 6 at temperatures between 100 and 550°C. Thermogravimetric and differential thermal analysis reaction profiles are described that reflect changes in the uranium fluorination/oxidation state, physiochemical effects, and instances of discrete chemical speciation. Large differences in the onset temperatures for each system investigated implicate changes in mode of the NF 3 gas-solid surface interaction. These studies also demonstrate that NF 3 is a potential replacement fluorinating agent in the existing nuclear fuel cycle and in actinide volatility reprocessing.

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Section: Nf 3 Fluorination Of Uomentioning

confidence: 91%

Section: Nf 3 Fluorination Of Uomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal reactions of uranium metal, UO2, U3O8, UF4, and UO2F2 with NF3 to produce UF6

McNamara

Scheele

Kozelisky

et al. 2009

Journal of Nuclear Materials

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“…Because of the high burn-up or special fuel type of such reactors, the traditional aqueous reprocessing technologies are not satisfactory for the treatment of the spent nuclear fuel. With the advantages of high radiation resistance, compact facilities, less generation of waste, and so forth, pyroprocessing technologies have been considered as the best choice to treat high burn-up spent fuel, and the fluoride volatility process (FVP), based on the different volatilities between uranium hexafluoride (UF 6 ) and fission product fluoride, has been regarded as a promising pyroprocessing technology for separating uranium from the spent nuclear fuel. − …”

Section: Introductionmentioning

confidence: 99%

Study on the Thermal Stability of the Na₂UF₈ Complex in the Argon Atmosphere

et al. 2020

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The Na 2 UF 8 complex is an important intermediate compound in the purification of UF 6 by the adsorption−desorption process during fluoride volatility of the spent nuclear fuel, and its decomposition is seriously affected by temperature and atmosphere. In this study, the thermal stability of Na 2 UF 8 in the argon atmosphere was investigated by the in situ Raman spectroscopy. The decomposition products of Na 2 UF 8 at different temperatures were systematically determined by X-ray diffraction spectroscopy and X-ray absorption fine structure spectroscopy. The results indicated that Na 2 UF 8 on the NaF sorbent was stable under 300 °C in the argon atmosphere, and it started to decompose into UF 6 and NaF rapidly when the temperature was above 300 °C. Meanwhile, a small amount of Na 2 UF 8 was converted to Na 3 UF 7 , and it was stable in the temperature range from 350 to 450 °C. The decomposition mechanism of the Na 2 UF 8 and the formation mechanism of Na 3 UF 7 on the NaF sorbent were speculated according to the experimental results.

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