KINETICS OF URANIUM DIOXIDE DISSOLUTION IN AMMONIUM CARBONATE.

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Abstract

The kinetics of UO//2 dissolution in ammoniacal carbonate solutions were studied as a function of total carbonate concentration, oxygen pressure, temperature and pH value. The intrinsic leaching (no external potential) of UO//2 agreed well with an electrochemical surface-reaction model, in which anodic oxidation of UO//2 is coupled with cathodic reduction of oxygen. The experimenCtal data corroborate an anodic dissolution sequence that includes both charge-transfer and chemical-reaction steps. Experimental evidence indicates that the mechanism involves consecutive one-electron-transfer steps.

Original languageEnglish (US)
JournalTransactions of the Institution of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy
Volume88
Publication statusPublished - Sep 1979
Externally publishedYes

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ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys

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