An investigation on the effects of Fe (FeIII, FeII) and oxidation reduction potential on the dissolution of synthetic uraninite (UO2)

Ram, R, Charalambous, F, Tardio, J and Bhargava, S 2011, 'An investigation on the effects of Fe (FeIII, FeII) and oxidation reduction potential on the dissolution of synthetic uraninite (UO2)', Hydrometallurgy, vol. 109, no. 12, pp. 125-130.


Document type: Journal Article
Collection: Journal Articles

Title An investigation on the effects of Fe (FeIII, FeII) and oxidation reduction potential on the dissolution of synthetic uraninite (UO2)
Author(s) Ram, R
Charalambous, F
Tardio, J
Bhargava, S
Year 2011
Journal name Hydrometallurgy
Volume number 109
Issue number 12
Start page 125
End page 130
Total pages 6
Publisher Elsevier
Abstract Forecasted increases in the use of nuclear technology for the production of electricity, which in turn will lead to future increases in demands for nuclear fuel, has led to increased interest in the processes used to extract uranium from ore deposits, particularly low grade deposits. These processes predominantly involve dissolution of the uranium mineral(s) in an acidic or basic solution and selective separation and purification of the dissolved uranium species. The primary uranium mineral uraninite (UO(2)), which is found in numerous ore deposits worldwide, is one of the main uranium minerals from which uranium is extracted to produce nuclear fuel. Hence an improved understanding of the chemistry involved in extracting uranium from this mineral is of interest. In this study the influence of some of the main parameters ([Fe((III))], [Fe((II))] and oxidation reduction potential (ORP)), that affect dissolution of UO(2) have been investigated under conditions similar to those used in tank based dissolution of uranium minerals. The dissolution of UO2 was found to most closely follow 1st order kinetics over the entire range of conditions studied ([H(2)SO(4)]=0.15 M, T=50 degrees C, UO(2)=100 mg/L (as U), Fe(III)=1.1E10(-4)-4.5E10(-2) M, Fe(II)=3.2E10(-4)-5.8E10(-1) M: Fe(TOT)=4.2E10(-4)-5.9E10(-1) M, ORP=380-565 mV). Investigations on the relationship between the UO2 dissolution rate and [Fe] at six different solution ORPs revealed a high dependency of the dissolution rate on [Fe] at higher solution ORP (>= 460 mV-565 mV), whilst at lower solution ORPs (<= 420), [Fe] had a lot lower influence on the UO(2) dissolution rate under the conditions used.
Subject Exploration Geochemistry
Keyword(s) Uraninite dissolution
Ferric and ferrous concentration
Oxidation reduction potential
DOI - identifier 10.1016/j.hydromet.2011.06.005
Copyright notice © 2011 Elsevier B.V. All rights reserved.
ISSN 0304-386X
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