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The Scientific World Journal
Volume 2014 (2014), Article ID 921974, 10 pages
http://dx.doi.org/10.1155/2014/921974
Research Article

Impacts of Nickel Nanoparticles on Mineral Carbonation

1Department of Chemical Engineering, KU Leuven, 3001 Leuven, Belgium
2Department of Environmental Engineering and Metallurgical Technological Systems, “Dunarea de Jos” University of Galati, 800201 Galaţi, Romania
3Department of Microbial and Molecular Systems, KU Leuven, 3001 Leuven, Belgium
4School of Engineering, University of Guelph, Guelph, Canada N1G 2W1

Received 29 August 2013; Accepted 31 October 2013; Published 22 January 2014

Academic Editors: Y. Hara and Z.-W. Liu

Copyright © 2014 Marius Bodor et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work presents experimental results regarding the use of pure nickel nanoparticles (NiNP) as a mineral carbonation additive. The aim was to confirm if the catalytic effect of NiNP, which has been reported to increase the dissolution of CO2 and the dissociation of carbonic acid in water, is capable of accelerating mineral carbonation processes. The impacts of NiNP on the CO2 mineralization by four alkaline materials (pure CaO and MgO, and AOD and CC steelmaking slags), on the product mineralogy, on the particle size distribution, and on the morphology of resulting materials were investigated. NiNP-containing solution was found to reach more acidic pH values upon CO2 bubbling, confirming a higher quantity of bicarbonate ions. This effect resulted in acceleration of mineral carbonation in the first fifteen minutes of reaction time when NiNP was present. After this initial stage, however, no benefit of NiNP addition was seen, resulting in very similar carbonation extents after one hour of reaction time. It was also found that increasing solids content decreased the benefit of NiNP, even in the early stages. These results suggest that NiNP has little contribution to mineral carbonation processes when the dissolution of alkaline earth metals is rate limiting.