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Properties and behavior of the platinum group metals in the glass resulting from the vitrification of simulated nuclear fuel reprocessing waste

Published online by Cambridge University Press:  31 January 2011

Ch. Krause  and
B. Luckscheiter
Ch. Krause
Affiliation:
Bundesamt für Strahlenschutz, Albert-Schweitzer-Str. 18, 3320 Salzgitter 1, Germany
B. Luckscheiter
Affiliation:
Institut für Nukleare Entsorgungstechnik, Kernforschungszentrum Karlsruhe GmbH, Postfach 3640, W-7500 Karlsruhe, Germany
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Abstract

Two types of platinum group metal particles were found in borosilicate nuclear waste glasses: needle-shaped RuO2 particles and spherical PdRhxTey alloys. They form a dense sediment of high electrical conductivity and relatively high viscosity at the bottom of the ceramic melting furnace. The sludge shows a non-Newtonian flow behavior. The viscosity and conductivity of the sludge depend not only on the platinum group metal content but also on the texture and morphology of the RuO2 particles. RuO2 forms long, needle-shaped crystals which are caused by alkalimolybdate salt melts that formed in the calcine layer. The salt melts oxidize the Ru present as small RuO2 particles after calcination to higher oxidation states. Ruthenium (VI) compounds are formed, presumably, which are not stable with respect to RuO2 under the melting conditions. RuO2 precipitates and crystallizes into long, needle-like particles.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 12 , December 1991 , pp. 2535 - 2546
Copyright
Copyright © Materials Research Society 1991

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