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Study on the Formation of Lanthanum Phosphate for Highly Efficient Incorporation of Actinides from Radioactive Liquid Waste

Published online by Cambridge University Press:  03 September 2012

Michitaka Sasoh ,
Shinya Miyamoto ,
Masumitu Toyohara  and
Mikio Wada
Michitaka Sasoh
Affiliation:
Nuclear Engineering Laboratory, Toshiba Corporation.
Shinya Miyamoto
Affiliation:
Nuclear Engineering Laboratory, Toshiba Corporation.
Masumitu Toyohara
Affiliation:
Nuclear Engineering Laboratory, Toshiba Corporation.
Mikio Wada
Affiliation:
Isogo Engineering Center, Toshiba Corporation
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Abstract

We have studied a co-precipitation method to remove actinides from radioactive liquid waste. Lanthanum phosphate was selected as a co-precipitation material because actinides and lanthanides are among the homology series in the periodic table. In this report, the conditions, under which the lanthanum compound is precipitated was looked at, as well as, ways to widen the pH range in which the precipitation occurrs in sodium nitrate solution. The properties of the resulting precipitates were also investigated. Further, we investigated the incorporation ratio of amerícium (decontamination factor), one of the actinides, into the precipitate from sodium nitrate solution. Lanthanum phosphate was found to be more effective compared to ferric compounds as the co-precipitation material to remove amerícium. The incorporation conditions for strontium using lanthanum phosphate were also investigated. The removal of strontium, by this method, was more effective when the pH is above 7.0.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 623
Copyright
Copyright © Materials Research Society 1997

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References

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