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The effect of phosphate melt cooling rate on phase composition and leach resistance of final waste form

Published online by Cambridge University Press:  22 December 2017

Konstantin V. Martynov ,
Elena V. Zakharova ,
Sergey V. Stefanovsky  and
Boris F. Myasoedov
Konstantin V. Martynov
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31/4 Moscow 119071 Russia
Elena V. Zakharova
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31/4 Moscow 119071 Russia
Sergey V. Stefanovsky*
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31/4 Moscow 119071 Russia
Boris F. Myasoedov
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31/4 Moscow 119071 Russia
*
*(Email: serge.stefanovsky@yandex.ru)
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Abstract

Slow cooling of phosphate melt at liquid nuclear waste solidification yields glass-crystalline material. Partial crystallization during melt solidification results in elemental partitioning among crystalline phase and glass: Al, Cr, Fe are concentrated in the crystalline phosphate phase while Ca, Ni, La, U enter predominantly in the residual glass. Glass dissolution rate and leach rate of La and U as rare earth and actinide surrogates depends strongly on the glass composition, for example reduction of Al2O3 content in the glass to ∼10-12 wt.% increases leachability by three orders of magnitude as compared to the glass with specified composition (∼18-22 wt.% Al2O3).

Keywords

crystallizationglassnuclear materialswaste managementx-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 20: Scientific Basis for Nuclear Waste Management XLI , 2018 , pp. 1085 - 1091
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Copyright
Copyright © Materials Research Society 2017 

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References

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