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Behavior of Uranium(VI) during HEDPA Leaching for Aluminum Dissolution in Tank Waste Sludges

Published online by Cambridge University Press:  26 February 2011

Brian Anthony Powell ,
Linfeng Rao ,
Kenneth L. Nash  and
Leigh Martin
Brian Anthony Powell
Affiliation:
[email protected], Lawrence Berkeley National Laboratory, Chemical Sciences Division, One Cyclotron Road, Mailstop 70A-1150, Berkeley, CA, 94720, United States, (510) 486-5377, (510) 486-5596
Linfeng Rao
Affiliation:
[email protected], Lawrence Berkeley National Laboratory, Chemical Sciences Division, United States
Kenneth L. Nash
Affiliation:
[email protected], Washington State University, Department of Chemistry, United States
Leigh Martin
Affiliation:
[email protected], Washington State University, Department of Chemistry, United States
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Abstract

Batch adsorption/dissolution experiments were conducted to examine the interactions between 233U(VI) and a synthetic aluminum oxyhydroxide (boehmite, γ-AlOOH) in 1.0M NaCl suspensions containing 1-hydroxyethane-1,1-diphosphonic acid (HEDPA). In the pH range 4 to 9, complexation of Al(III) by HEDPA significantly enhanced dissolution of boehmite. This phenomenon was especially pronounced in the neutral pH region where the solubility of aluminum, in the absence of complexants, is limited by the formation of sparsely soluble aluminum hydroxides. At high pH levels, dissolution of synthetic boehmite was inhibited by HEDPA, likely due to sorption of Al(III)/HEDPA complexes. Addition of HEDPA to equilibrated U(VI)-synthetic boehmite suspensions yielded an increase in the aqueous phase uranium concentration. The concentration of uranium continually increased over 59 days. Partitioning of uranium between the solid and aqueous phase was found to correlate well with HEDPA partitioning.

Keywords

actinideadsorptionwaste management
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ07-02
Copyright
Copyright © Materials Research Society 2006

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References

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