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Dissolution of stoichiometric uraninite

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Abstract

A comparative study of dissolution of stoichiometric uraninite (UO2), schoepite hydrate (UO3·H2O), and uranium(IV) hydroxide [U(OH)4] was made. In the initial step, UO2 is oxidized with oxygen dissolved in water to form an oxide that is richer in oxygen and therefore dissolves more readily. This is followed by formation on the uraninite surface of hydroxo complexes, which are stable under the conditions of their formation and form a passivating layer of a sort. In this case, the character of the dissolution process changes, and the transfer of the uranium hydroxo complexes formed to the solution becomes the limiting step. It follows from the comparison of the results obtained that, in the initial step of dissolution of stoichiometric uraninite under both dynamic and static conditions, schoepite is not an intermediate phase of the paragenetic sequence of mineral phase formation.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, block 4, Moscow, 119071, Russia

    V. V. Ivanov & I. B. Popov

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  1. V. V. Ivanov
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  2. I. B. Popov
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Correspondence to V. V. Ivanov.

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Original Russian Text © V.V. Ivanov, I.B. Popov, 2013, published in Radiokhimiya, 2013, Vol. 55, No. 1, pp. 41–44.

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Ivanov, V.V., Popov, I.B. Dissolution of stoichiometric uraninite. Radiochemistry 55, 72–76 (2013). https://doi.org/10.1134/S106636221301013X

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  • DOI: https://doi.org/10.1134/S106636221301013X

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