Effect of liquid and supercritical carbon dioxide treatments on the leaching performance of a cement-stabilised waste form

Cement-based stabilisation processes are frequently used for immobilising wastes containing a variety of toxic compounds. In order to improve and extend cement-based stabilisation processes, research has been carried out to examine the role of carbonation (i.e. the interaction of cement-based materi...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2004-07, Vol.30 (2), p.175-188
Main Authors: Van Ginneken, Luc, Dutré, Veronika, Adriansens, Walter, Weyten, Herman
Format: Article
Language:English
Subjects:
Cement
Leaching
Supercritical carbonation
Waste form
Waste management
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Summary:Cement-based stabilisation processes are frequently used for immobilising wastes containing a variety of toxic compounds. In order to improve and extend cement-based stabilisation processes, research has been carried out to examine the role of carbonation (i.e. the interaction of cement-based materials with atmospheric CO 2) on the leaching of inorganic contaminants from cementitious waste forms. Because supercritical CO 2 has a high diffusivity and a density over 2 orders of magnitude higher than gaseous CO 2, carbonation reactions in cementitious materials can be strongly accelerated by using supercritical CO 2 as the carbonating atmosphere, rather than using CO 2 gas under ambient pressure. In this paper, therefore, the effect of subcritical (liquid) and supercritical CO 2 treatments on the leaching behaviour of a cementitious waste form is presented. Different CO 2 pressure and temperature conditions ( 100 bar
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2003.07.004