Bioleaching of UO22+ ions from a Romanian poor uranium ore

  • Al. Cecal
  • K. Popa
  • M. Craus
  • S. Patachia
  • R. T. Moraru


The present paper deals with an experimental study on the bioleaching of a poor uranium ore by means of hydrophytic plants Lemna minor and Riccia fluitans, under various operating conditions. The maximum degree of bioleaching (42%) of the reduced uranium species to U(VI) has been attained for the ore-Lemna minor-alkaline carbonate solution system. The UO22+ ions amount accumulated in the plants is negligible as compared to the dissolved quantity, owing to the ionic competition between uranyl ions and the cations necessary to the mineral nutrition. The X-ray diffraction patterns prove that the uranium species in pyrochlore mineral are completely oxidized to U(VI), while thucolite is only partially turned into UO22+ ions, in the presence of living plants.


Inorganic Chemistry Uranium Diffraction Pattern Uranyl Maximum Degree 
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Copyright information

© Kluwer Academic Publishers/Akadémiai Kiadó 2002

Authors and Affiliations

  • Al. Cecal
    • 1
  • K. Popa
    • 1
  • M. Craus
    • 2
  • S. Patachia
    • 3
  • R. T. Moraru
    • 1
  1. 1.Faculty of Chemistry“Al. I. Cuza” UniversityIasiRomania
  2. 2.Institute of Technical PhysicsIasiRomania
  3. 3.“Transilvania” Technical University of BrasovRomania

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