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Effects of Redox Condition on Waste Glass Corrosion in the Presence of Magnetite

Published online by Cambridge University Press:  15 February 2011

Ylnagaki ,
A. Ogata ,
H. Furuya ,
K. Idemitsu ,
T. Banba  and
T. Maeda
Ylnagaki
Affiliation:
Dept. of Nucl. Eng., Kyushu Univ., Fukuoka 812, Japan.
A. Ogata
Affiliation:
Dept. of Nucl. Eng., Kyushu Univ., Fukuoka 812, Japan.
H. Furuya
Affiliation:
Dept. of Nucl. Eng., Kyushu Univ., Fukuoka 812, Japan.
K. Idemitsu
Affiliation:
Dept. of Nucl. Eng., Kyushu Univ., Fukuoka 812, Japan.
T. Banba
Affiliation:
Dept. of Environmental Safety Research, Jaeri, Tokai-mura, lbaraki 319-11, Japan.
T. Maeda
Affiliation:
Dept. of Environmental Safety Research, Jaeri, Tokai-mura, lbaraki 319-11, Japan.
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Abstract

Static corrosion tests of a powdered simulated waste glass were performed in the presence of magnetite under oxic and anoxic conditions, respectively. The corrosion tests under oxic conditions were performed in air, and those under anoxic conditions were performed in a glove box purged with mixed gas(Ar+5%H2). The experimental results showed that the presence of magnetite can enhance glass corrosion under both oxic and anoxic conditions, and the enhancement under anoxic conditions was small compared to that under oxic conditions. A large portion of the Si and insoluble elements were sorbed onto the magnetite surface, and the sorption under anoxic conditions was small compared to that under oxic conditions.

It was suggested that the enhancement of glass corrosion by magnetite results from the sorption or precipitation of silica on the magnetite surface, which can be greatly affected by redox condition. Under anoxic conditions, it was suggested that precipitation of amorphous silica on the magnetite surface may be the dominant process for enhancement of glass corrosion in addition to sorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 257
Copyright
Copyright © Materials Research Society 1996

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