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Hydrothermal Conversion of Trachytic Glass to Zeolite. 3. Monocationic Model Glasses

Published online by Cambridge University Press:  28 February 2024

Maurizio De’ Gennaro ,
Alessio Langella ,
Piergiulio Cappelletti  and
Carmine Colella
Maurizio De’ Gennaro
Affiliation:
Dipartimento di Scienze della Terra dell'Università Federico II, Via Mezzocannone 8, 80134 Napoli, Italy
Alessio Langella
Affiliation:
Università del Sannio, Via Caio Ponzio Telesino, 11, 82100, Benevento, Italy
Piergiulio Cappelletti
Affiliation:
Dipartimento di Scienze della Terra dell'Università Federico II, Via Mezzocannone 8, 80134 Napoli, Italy
Carmine Colella
Affiliation:
Dipartimento d'Ingegneria dei Materiali e della Produzione dell'Università Federico II, Piazzale V. Tecchio 80, 80125, Napoli, Italy
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Abstract

Experiments on zeolitization were conducted on four synthetic monocationic glasses (Na, K, Ca, or Mg-rich glass) with Si/Al molar ratios of 2.67, similar in acidity to many volcanic glasses of partially zeolitized Italian tuffs. The products of the hydrothermal treatment at 100, 150, and 200°C of single glasses or glass mixtures with deionized H2O or monosaline solutions (NaCl, KCl, CaCl2) were characterized by X-ray diffraction, thermal, microscopic and chemical analyses. Chemical analyses of mother liquors were also performed. Mineral assemblages, containing chabazite, phillipsite, analcime, and K-feldspar, very similar to those found in altered, volcaniclastic alkali-trachytic or trachytic glass deposits were produced. Potassium was essential to chabazite and phillipsite crystallization, although phillipsite was obtained also in Ca-Na mixed systems. Sodium was necessary for analcime formation. Calcium plays only a secondary role in zeolitization, and magnesium does not favor zeolite crystallization but promotes the formation of smectite. Glass composition determines the mineral assemblages obtained and hence in those commonly found in nature.

Keywords

AnalcimeChabaziteGlass-to-Zeolite ConversionPhillipsiteSynthesisTrachytic GlassesZeolite Synthesis
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 3 , June 1999 , pp. 348 - 357
Copyright
Copyright © 1999, The Clay Minerals Society

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