DBPapers
DOI: 10.5593/SGEM2016/B41/S16.004

INVESTIGATION OF IRON PRECIPITATE EMBEDDING IN CEMENT MATRIX AT DIFFERENT DISPOSAL PERIODS AND CONDITIONS

L.Ionascu, M. Nicu, F. Dragolici
Wednesday 7 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-63-6 / ISSN 1314-2704, June 28 - July 6, 2016, Book4 Vol. 1, 25-32 pp

ABSTRACT
Precipitation of iron hydroxide and/or iron phosphate is one of the most used treatment process for radioactive low level aqueous waste and also for many aqueous industrial waste containing toxic metals followed by stabilization / solidification mainly in Portland cement. The study of the precipitation products resulted in the radioactive waste processing and their behaviour during the cementation and long term disposal is extremely difficult because of their complexity (phase composition and structure) and the lack of the non-destructive analytical methods. Knowledge of the microstructure is important to assess the compatibility of radioactive waste streams with cement to be able to predict the performance of the waste form during storage and disposal. The conditioning of the radioactive wastes by cementation process involves a structural investigation by X-ray diffraction (XRD) and a mechanical characterization of the samples prepared with cement and iron precipitates.

Keywords: Cement, radioactive waste, conditioning matrix

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