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Immobilization and Long-term Evolution of Selenate in Portland Cement

Published online by Cambridge University Press:  01 February 2011

Isabel Rojo ,
Mireia Grive ,
Miquel Rovira ,
Olga Riba ,
David Garcia ,
Cristina Domènech  and
Joan De Pablo
Isabel Rojo
Affiliation:
[email protected], CTM, Manresa, Spain
Mireia Grive
Affiliation:
[email protected], AMPHOS 21, Barcelona, Spain
Miquel Rovira
Affiliation:
[email protected], CTM, Manresa, Spain
Olga Riba
Affiliation:
[email protected], AMPHOS 21, Barcelona, Spain
David Garcia
Affiliation:
[email protected], AMPHOS 21, Barcelona, Spain
Cristina Domènech
Affiliation:
[email protected], AMPHOS 21, Barcelona, Spain
Joan De Pablo
Affiliation:
[email protected], UPC, Chemical Engineering, Barcelona, Spain
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Abstract

The long-term selenate uptake capacity of leached cement was studied by means of a replenishment batch experiment with cement pore water (CPW) doped with selenate. The corresponding blank experiment (without Se) was also done. The systems were studied for 31 cycles (18-days each cycle) to understand the long-term selenate immobilization in leached cement. Results showed that the retention capacity of leached cement exponentially decreases with cycle evolution. Precipitation of ettringite, identified by SEM and XRD, occurred along the experiments. The characterization of the cement solid phases indicated that selenate was only retained in the precipitated ettringite.

Experimental data have been successfully modeled by assuming that selenate incorporates into the precipitating ettringite. Precipitation of ettringite is controlled by the kinetic dissolution of the initially present monocarboaluminate.

Keywords

Seabsorptionsecond phases
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1265: Symposium AA – Scientific Basis for Nuclear Waste Management XXXIV , 2010 , 1265-AA06-05
Copyright
Copyright © Materials Research Society 2010

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