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Applicability of V2O5-P2O5 Glass System forLow-Temperature Vitrification

Published online by Cambridge University Press:  03 September 2012

T. Nishi ,
K. Noshita ,
T. Naitoh ,
T. Namekawa ,
K. Takahashi  and
M. Matsuda
T. Nishi
Affiliation:
Power & Industrial Systems R&D Division, Hitachi Ltd., 7–2–1 Omika, Hitachi, Ibaraki 319–12, Japan.
K. Noshita
Affiliation:
Power & Industrial Systems R&D Division, Hitachi Ltd., 7–2–1 Omika, Hitachi, Ibaraki 319–12, Japan.
T. Naitoh
Affiliation:
Hitachi Research Laboratory, Hitachi Ltd., 3–1–1 Saiwai, Hitachi, Ibaraki 317, Japan.
T. Namekawa
Affiliation:
Hitachi Research Laboratory, Hitachi Ltd., 3–1–1 Saiwai, Hitachi, Ibaraki 317, Japan.
K. Takahashi
Affiliation:
Hitachi Research Laboratory, Hitachi Ltd., 3–1–1 Saiwai, Hitachi, Ibaraki 317, Japan.
M. Matsuda
Affiliation:
Hitachi Works, Hitachi Ltd., 3–1–1 Saiwai, Hitachi, Ibaraki 317, Japan.
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Abstract

The V2O5-P2O5 glass system (vanadate glass) has been developed to providelow temperature vitrification of radioactive waste without volatilization ofradionuclides. The dissolution behaviour of vanadate glass was determinedfrom the results of the MCC-1 static leach test at 70 ‘C using deionizedwater, cement-saturated alkaline water, and cement-saturated alkaline waterwith 3% NaCl. The solubility of vanadate glass was remarkably reduced by theaddition of Sb2O3to the glass. It was also lowered inthe cement-saturated water due to formation of a precipitation layer.Although the presence of NaCl in the solution accelerated the dissolution ofvanadate glass, the addition of alkaline earth metal oxide to the glass gavea dissolution rate three orders lower than non-additive vanadate glass. Theresults of leach tests using simulated vitrified waste form containing 5moI%of Cs2 and SrO showed there was a possibility of fixing Cs and Srinto the glass structure.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 221
Copyright
Copyright © Materials Research Society 1997

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References

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