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Influence of OH- concentration on the illitization of kaolinite at high pressure

AuthorsMantovani, Marco ; Escudero, A. ; Becerro, Ana Isabel
Issue Date2011
CitationApplied Clay Science 51: 220- 225 (2011)
AbstractThe products of hydrothermal reactions of kaolinite at 300°C and 1000 bars were studied in KOH solutions covering an OH- concentration, [OH-], of 1M to 3.5M. XRD patterns indicated a notable influence of the [OH-] on the reaction. At [OH]≥3M, the only stable phase was muscovite/illite. The content of muscovite/illite was calculated from the analysis of the diagnostic 060 reflections of kaolinite and muscovite/illite. The results showed a linear dependence of kaolinite and muscovite/illite contents with [OH-]. 27Al MAS NMR spectroscopy revealed the formation of small nuclei of K-F zeolite at high [OH-]. Finally, modelling of the 29Si MAS NMR spectra indicated that the Si/Al ratio of the muscovite/illite formed was very close to that of muscovite, at least in the mineral formed at low [OH-]. In good agreement with the XRD data, the quantification of the reaction products by 29Si MAS NMR indicated a linear decrease of the kaolinite content with increasing OH- concentration. © 2010 Elsevier B.V.
Identifiersdoi: 10.1016/j.clay.2010.11.021
issn: 0169-1317
Appears in Collections:(ICMS) Artículos
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