Monitoring of transformations in bentonite after NaOH-TMA treatment

Semi-quantitative methods of X-ray diffraction and FTIR-spectroscopy, accompanied by electron microscopy, X-ray microanalysis and others were used to monitor structural-phase reorganizations occurring in a smectite–gypsum mixture (bentonite) subjected to NaOH treatment with the subsequent addition o...

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Bibliographic Details
Published in:Ceramics international 2007-04, Vol.33 (3), p.405-412
Main Authors: Vlasova, M., Leon, I., Méndez, Y. Enríquez, Dominguez-Patiño, G., Kakazey, M., Dominguez-Patiño, M., Nikolic, M.V., Ristic, M.M.
Format: Article
Language:English
Subjects:
Bentonite
Earth sciences
Earth, ocean, space
Exact sciences and technology
Mineralogy
Monitoring
NaOH
Quaternary ammonium salt
Saturation
Silicates
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Summary:Semi-quantitative methods of X-ray diffraction and FTIR-spectroscopy, accompanied by electron microscopy, X-ray microanalysis and others were used to monitor structural-phase reorganizations occurring in a smectite–gypsum mixture (bentonite) subjected to NaOH treatment with the subsequent addition of quaternary ammonium salt (TMA) in conditions of water deficiency. The interaction of bentonite with NaOH breaks up large bentonite aggregates, saturates smectite with Na cations, and yields Ca(OH) 2. The addition of TMA is accompanied by its penetration into the interlayer space and adsorption on the surface.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2005.09.024