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Hugues Aubriet, Bernard Humbert, Michel Perdicakis

Interaction of U(VI) with pyrite, galena and their mixtures: a theoretical and multitechnique approach

Keywords: Uranyl, Pyrite, Galena, Sulphides mixture, Galvanic interactions

Pyrite and/or galena particles previously conditioned with U(VI) at pH 6 have been characterized by micro-Raman spectrometry, voltammetry, scanning electron microscopy and high resolution X-ray photoelectron spectroscopy. U₃O₈ is first formed on the sulphide surfaces via a redox process, then, if an excess of U(VI) remains in solution it is sorbed as UO₃ and shoepite. Galvanic phenomena occur when the minerals are in mixture in a medium containing U(VI): galena particles are oxidized whereas U(VI) is reduced at the pyrite particle surface. The maximum amounts of fixed uranium are 0.4 mmol/g for pyrite and 0.1 mmol/g for galena and the 50:50 pyrite:galena mixture.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 94, 09/2006
Pages: 657 - 663

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