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Transformation of synthetic U3O8 into different uranium oxide hydrates

Umwandlung von synthetischem U3O8 in verschiedene Uranoxidhydrate

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Summary

Referring to the natural formation of secondary uranium minerals, the primary transformation of U3O8 into schoepite has been investigated. The transformation is realized in a continuous system with O2, CO2 and H2O. At 100°C schoepite III, UO3 · zH2O (z ≅ 1), is formed (a = 14.12; b = 16.83; c = 15.22 Å) with a density of 4.460 g/cm3. At 25°C a mixture of schoepite II (UO3 · yH2O, 1 < y < 2; a = 13.99; b = 16.72; c = 14.73 Å) and schoepite I (UO3 · xH2O, x ≅ 2; a = 14.33; b = 16.79; c = 14.73 Å) is obatined. From thermogravimetric analysis the activation energy of dehydration for schoepite III is determined as 49(3) · 103 J/mole.

Zusammenfassung

In Hinblick auf die natürliche Bildung sekundärer Uranminerale wurde die primäre Umwandlung von U3O8 in Schoepit untersucht. Die Umwandlung wurde in einem kontinuierlichen System mit O2, CO2 und H2O bewerkstelligt. Bei 100°C bildet sich Schoepit III (UO3 · zH2O, z ≅ 1; a = 14.12, b = 16.83, c = 15.22 Å; Dichte: 4.460 g/cm3). Bei 25°C wird eine Mischung von Schoepit II (UO3 · yH2O, 1 < y < 2; a = 13.99, b = 16.72, c = 14.73 Å) und Schoepit I (UO3 · xH2O, x ≅ 2; a = 14.33, b = 16.79, c = 14.73 Å) erhalten. Aus der thermogravimetrischen Analyse wurde die Aktivierungsenergie der Dehydratation von Schoepit III mit 49(3) · 103 J/mole berechnet.

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Authors and Affiliations

  1. Middelheimlaan 1, B-2020, Antwerpen, Belgium

    R. Vochten

  2. Proeftunistraat 86, B-9000, Gent, Belgium

    E. De Gravel

  3. Groenenborgerlaan 171, B-2020, Antwerpen, Belgium

    H. Lauwers

Authors
  1. R. Vochten
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  2. E. De Gravel
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  3. H. Lauwers
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Who wishes to dedicate the paper to the memory of his father, Hendrik Vochten.

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Vochten, R., De Gravel, E. & Lauwers, H. Transformation of synthetic U3O8 into different uranium oxide hydrates. Mineralogy and Petrology 41, 247–255 (1990). https://doi.org/10.1007/BF01168498

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  • DOI: https://doi.org/10.1007/BF01168498

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