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Coprecipitation of Sr, Ni and U with CaCO3: An Experimental Study

Published online by Cambridge University Press:  15 February 2011

Torbjörn Carlsson  and
Hannu Aalto
Torbjörn Carlsson
Affiliation:
VTI Chemical Technology, P.O. Box 1404, FIN-02044 VTIT, Finland
Hannu Aalto
Affiliation:
VTI Chemical Technology, P.O. Box 1404, FIN-02044 VTIT, Finland
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Abstract

At the Finnish candidate sites for a nuclear waste repository, calcite (CaCO3) is a common fracture mineral that may participate in coprecipitation processes. The objective of this preliminary work was to study the coprecipitation of the trace elements Sr, Ni, and U with CaCO3 under controlled conditions. The experiments were made in a titration vessel at room temperature under pure N2 or a 0.1 % CO 2/N2 mixture. The water phase contained CaCl2 (0.01M) and NaCl (0.05 M) to which trace amounts of Ni2+, Sr2+ and UO22+ were initially added. CaCO3 was precipitated by the addition of Na2CO3 and the use of CaCO3 seed crystals. When about 10−4 mol of precipitate had formed, the solution and solid phases were analysed with ICPMS. The results seem to indicate that Ni coprecipitated with CaCO3 under the experimental conditions, while U did not. In the case of Sr, further data are needed in order to make any conclusions from the experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 647
Copyright
Copyright © Materials Research Society 1996

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