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REE and TRU Incorporation into Monazite Structure Ceramics

Published online by Cambridge University Press:  17 March 2011

S. I. Rovnyi ,
G. M. Medvedev ,
A. S. Aloy ,
T. I. Koltsova  and
S. E. Samoylov
S. I. Rovnyi
Affiliation:
Production Association Mayak, Ozyorsk, Chelyabinsk Region, Russian Federation
G. M. Medvedev
Affiliation:
Production Association Mayak, Ozyorsk, Chelyabinsk Region, Russian Federation
A. S. Aloy
Affiliation:
RPA V.G. Khlopin Radium Institute, St. Petersburg, Russian, E–mail:, [email protected]
T. I. Koltsova
Affiliation:
RPA V.G. Khlopin Radium Institute, St. Petersburg, Russian
S. E. Samoylov
Affiliation:
RPA V.G. Khlopin Radium Institute, St. Petersburg, Russian
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Abstract

One of the high levels of actinide, and in particular Cm, waste streams at the Russian radiochemical Production Association (PA) Mayak was generated during spent fuel reprocessing. Using oxalate precipitation, the rare earth elements (REE) and transuranic elements (TRU) settled out in the form of oxalate residues. Due to in high REE contents in this residue, the mineral-like matrix based on (REE)PO4 solid solution, with monlclinic monazite structure have been proposed to use as a suitable ceramics form for final actinide immobilization. For this purpose the synthetic REE oxalates were first transformed into REE orthophosphates in a thin-film evaporator (TFE). Then the (REE)PO4 powder was compacted both by either hot uniaxial pressing (HUP) or cold uniaxial pressing followed by sintering (CUP). This ceramic with the monazite structure has a high density and exhibits chemical durability by leaching.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 824: Symposium CC – Scientific Basis for Nuclear Waste Management XXVIII , 2004 , CC4.4
Copyright
Copyright © Materials Research Society 2004

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