UF<sub>6</sub>-3NaF Complex Formation and Decomposition

Cathers, G.I.; Bennett, Max R.; Jolley, R.L.

doi:10.1021/ie50587a055

Cited by 22 publications

(5 citation statements)

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“…According to data obtained by foreign researchers the degree of desorption of uranium hexafluoride at atmospheric pressure and a temperature about 400°C varies in the range 80-90% [7,8,[11][12][13]. Similar results have been obtained by Russian scientists, who noted that the rate of reaction (4) is 10 times higher than that of reaction (10).…”

supporting

confidence: 56%

Reduction of uranium hexafluoride adsorbed on sodium fluoride

et al. 2010

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The problem of the formation of uranium residue in spent sodium fluoride sorbent is studied. The mechanisms of the formation of un-desorbed uranium residue with thermal desorption of uranium hexafluoride from the surface sodium fluoride are examined. It is proved that hydrolysis of sorbed and gaseous uranium hexafluoride under the conditions of sublimate-separation production is impossible. The most likely mechanism of residue formation is partial reduction of hexavalent uranium, which is due to the chemical properties of the system UF 6 -NaF. A possible process of uranium reduction as a result of nuclear-chemical transformations requires study and experimental confirmation.Sorption technologies of catching, separation, decontamination, and salvaging of gaseous mixtures containing uranium hexafluoride, hydrogen fluoride, fluorine, and chlorine trifluoride as well as other volatile fluorides, using other fluoride adsorbents, for example, lithium fluoride, as the adsorbent granular sodium fluoride are finding increasing applications in industrial production and scientific research [1][2][3][4][5][6][7]. For this reason, some questions arising with the use sodium fluoride as the sorbent are general and require a scientific explanation and subsequent resolution.One problem is that the sorbent gradually loses capacity during multiple cycles of sorption-desorption of uranium hexafluoride. This problem is related with the accumulation in the sorbent of un-desorbed residues of uranium, which forms at the stage of desorption at elevated temperature with a strong complex compound of uranium and sodium fluorides being formed.The present work is devoted to a study and analysis of the formation and possible mechanisms of accumulation of un-desorbed uranium residue in the process of thermal desorption of uranium hexafluoride from sodium fluoride sorbent.The sorption of uranium hexafluoride on sodium fluoride occurs according to the reactions UF 6 + 2NaF = UF 6 ·2NaF;(1) UF 6 ·2NaF + UF 6 = 2(UF 6 ·NaF),and thermal desorption occurs according to the inverse reactions 2(UF 6 ·NaF) = UF 6 ·2NaF + UF 6 ;(3) UF 6 ·2NaF = UF 6 + 2NaF.

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confidence: 56%

Reduction of uranium hexafluoride adsorbed on sodium fluoride

et al. 2010

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“…Many studies have reported the reversible sorption-desorption of UF 6 in NaF (Cathers et al, 1958;Katz, 1963) including large-scale industrial use (Schultz et al, 1981). Sodium fluoride will also sorb other species such as HF and MoF 6 .…”

Section: Separations Methods Based On Fluoride Volatilitymentioning

confidence: 99%

Molten Salt Reactor Engineering Study for Off-Gas Management

McFarlane

Riley

Holcomb

et al. 2020

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“…The trapping of UF 6 by NaF was revisited by Grosse in 1941 (Grosse, 1941). Since then, numerous studies have reported the reversible sorptiondesorption of UF 6 in NaF (Cathers et al, 1958;Katz, 1963) including large-scale industrial use (Schultz et al, 1981). Sodium fluoride pellets can be made by mixing the powder with water to form agglomerates that are pelletized, the pellets are then dehydrated and sintered (Richardson and McNeese, 1968) as described previously for MgF 2 .…”

Section: Identification Of Potential Waste Processing and Waste Form Options For Molten Salt Reactorsmentioning

confidence: 99%