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Physical Properties and Leachability of MLW Stream Containing Cr, Ni and Cd Immobilized in a Cement Matrix

Published online by Cambridge University Press:  26 February 2011

E. Zamorani ,
I. A. Sheikh ,
M. Della Rossa  and
G. Serrini
E. Zamorani
Affiliation:
Commission of the European Communities, Joint Research Centre, Ispra Establishment, 21020 Ispra (Va) - Italy
I. A. Sheikh
Affiliation:
Pakistan Atomic Energy Commission P.O. Box 1114 - Islamabad Pakistan (at Ispra, under a research grant from DG XII, CEC-Brussels)
M. Della Rossa
Affiliation:
Commission of the European Communities, Joint Research Centre, Ispra Establishment, 21020 Ispra (Va) - Italy
G. Serrini
Affiliation:
Commission of the European Communities, Joint Research Centre, Ispra Establishment, 21020 Ispra (Va) - Italy
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Abstract

Cement samples containing variable amounts of Cr(III) or Ni(II) or Cd(II) as chloride admixtures present in a MLW stream from reprocessing of spent fuel were prepared under established procedure. Due to the high pH generated in the cement clinker hydration, respective metal hydroxides are formed and improve the physical characteristics of the cement matrix. An increase in the value of the compressive strength was observed when about 7% of the above elements were blended in cement. The increase depends on the nature of the element in the sequence Cr >Ni >Cd.

The leach tests confirm the formation of insoluble hydroxide presenting a low concentration in the leachate corresponding to 0.05, 0.004 and 0.052 mg.L−1 for Cr, Ni and Cd, respectively. On the other hand, the hydro-lyzed chloride ions seem to react with calcium with consequent increased degradation of the cement matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 489
Copyright
Copyright © Materials Research Society 1989

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References

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