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Purification of Alkaline Waste Solutions from Np and Pu

Published online by Cambridge University Press:  10 February 2011

A. V. Guelis ,
V. P. Shilov  and
N. N. Krot
A. V. Guelis
Affiliation:
Institute of Physical Chemistry, Russian Academy of Sciences, Moscow, [email protected]
V. P. Shilov
Affiliation:
Institute of Physical Chemistry, Russian Academy of Sciences, Moscow, [email protected]
N. N. Krot
Affiliation:
Institute of Physical Chemistry, Russian Academy of Sciences, Moscow, [email protected]
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Abstract

Coprecipitation of Np and Pu with Co(OH)3 and Fe(OH)3, obtained by the Method of Appearing Reagents from Co(NH3)6 Cl3, K2FeO4, and Na2[Fe(CN)5NO]2H2O from alkaline solutions and from simulants of Hanford Site tank wastes has been studied. Removal of Np and Pu from pH 10.5 to 0.4 M NaOH is semiquantitative with decontamination factors of 80 to 400. The presence of EDTA and HEDTA interferes with the precipitation of Co(OH)3 and Fe(OH)3. The deleterious effect of EDTA was eliminated by Ca2 addition at a 1:1 molar ratio of Ca2:EDTA. The deleterious effect of HEDTA was eliminated by the addition of 0.11 M excess precursor Co(NH3)6Cl3 to increase the content of carrier Co(OH)3.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 1299
Copyright
Copyright © Materials Research Society 1999

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References

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