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Mineralogical stability of phyllosilicates in hyperalkaline fluids: Influence of layer nature, octahedral occupation and presence of tetrahedral Al
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Ana I. Becerro
,
Marco Mantovani
Published/Copyright:
April 1, 2015
Abstract
Mineralogical changes in a set of phyllosilicates, differing in their layer nature, chemical composition, octahedral character, and Al content of the tetrahedral sheet, were analyzed after hydrothermal reaction in an alkaline solution. The composition of the alkaline solution was selected to simulate the first stage of cement degradation [NaOH-KOH-Ca(OH)2]. The reaction products have been analyzed by XRD, 29Si and 27Al MAS NMR spectroscopy, SEM/EDX, and TEM. The results indicate that the main factor influencing the stability of the clays is the occupation of the octahedral sheet such that all trioctahedral members withstand the alkaline attack, whereas most of the dioctahedral clays suffer a complete dissolution and crystallization of new phases. Second, clays with Al in the tetrahedral sheet of their layers are shown to be less stable than those with a pure Si tetrahedral sheet.
Received: 2008-11-24
Accepted: 2009-5-5
Published Online: 2015-4-1
Published in Print: 2009-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Clay minerals;
stability;
alkaline fluid;
nuclear waste repositories;
MAS NMR
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- Quantitative microstructural characterization of natrojarosite scale formed during high-pressure acid leaching of lateritic nickel ore
- Magnetic and microscopic characterization of magnetite nanoparticles adhered to clay surfaces
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