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Reaction of Montmorillonite in Alkaline Solution at 60°C, 90°C, 120°C and 180°C

Published online by Cambridge University Press:  10 February 2011

Takayuki Amaya ,
Mikio Shimojo ,
Hiroshi Fujihara  and
Katsuhiko Yokoyama
Takayuki Amaya
Affiliation:
JGC CORPORATION, 2205, Naritacho Oaraimachi, Ibaraki Pref., 311-1313, Japan
Mikio Shimojo
Affiliation:
JGC CORPORATION, 2205, Naritacho Oaraimachi, Ibaraki Pref., 311-1313, Japan
Hiroshi Fujihara
Affiliation:
TEPCO, 1-1-3, Uchisaiwai-cho, Chiyoda-ku, Tokyo, 100-0011, Japan
Katsuhiko Yokoyama
Affiliation:
RWMC, No. 15.Mori-bldg., 2-8-10, Toranomon, Minato-ku, Tokyo, 105-0001, Japan
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Abstract

The reaction of montmorillonite was investigated. Three kinds of bentonites with different montmorillonite composition were mixed with 0.3M NaOH solution and 0.3M Ca(OH)2 slurry. They were immersed at 60°C, 90°C, 120°C and 180°C for one month, three months and six months. The concentrations of the soluble ions were measured and the bentonites were analyzed quantitatively after the immersion. 50% of the montmorillonite was reacted within two weeks at greater than 90°C. Montmorillonite reacts less when mixed with Si-minerals. It extensively reacted in 0.3M Ca(OH)2 slurry. These results suggest that the reaction mechanism of the montmorillonite in alkaline solution was dominantly Si dissolution, and would decrease by controlling the concentration of Si ion. The cement / bentonite system under Si saturated conditions is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 655
Copyright
Copyright © Materials Research Society 1999

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References

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