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Leaching Studies of Cement-Glass Package Containing Sodium Borate

Published online by Cambridge University Press:  28 February 2011

Masahiro Okamoto ,
Koichi Chino ,
Tsutomu Baba ,
Tatsuo Izumida ,
Fumio Kawamura  and
Makoto Kikuchi
Masahiro Okamoto
Affiliation:
Kansai Electric Power Co., Osaka, Japan
Koichi Chino
Affiliation:
Energy Research Laboratory, Hitachi Ltd., 1168 Moriyama, Hitachi, Ibaraki 316, Japan
Tsutomu Baba
Affiliation:
Energy Research Laboratory, Hitachi Ltd., 1168 Moriyama, Hitachi, Ibaraki 316, Japan
Tatsuo Izumida
Affiliation:
Energy Research Laboratory, Hitachi Ltd., 1168 Moriyama, Hitachi, Ibaraki 316, Japan
Fumio Kawamura
Affiliation:
Energy Research Laboratory, Hitachi Ltd., 1168 Moriyama, Hitachi, Ibaraki 316, Japan
Makoto Kikuchi
Affiliation:
Hitachi Works, Hitachi Ltd., 3-1-1 Saiwaicho, Hitachi, Ibaraki 317, Japan
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Abstract

A new solidification technique using cement-glass, which is a mixture of sodium silicate, cement, additives, and initiator of the solidification reaction, was developed for sodium borate liquid waste generated from pressurized water reactor (PWR) plants. The cement-glass could solidify eight times as much sodium borate as cement could, because the solidifying reaction of the cement-glass is not hindered by borate ions.

The reaction mechanism of sodium silicate and phosphoric silicate (initiator), the main components of cement-glass, was studied through X-ray diffraction and compressive strength measurements. It was found that three- dimensionally bonded silicon dioxide was produced by polymerization of the two silicates. The leaching ratio of cesium from the cement-glass package was one-tenth that of the cement one. This low value was attributed to a high cesium adsorption ability of the cement-glass and it could be theoretically predicted accordingly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 393
Copyright
Copyright © Materials Research Society 1987

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References

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