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The Solid-State Conversion of Kaolin to KAlSiO4 Minerals: The Effects of Time and Temperature

Published online by Cambridge University Press:  01 January 2024

Daniela Novembre  and
Domingo Gimeno
Daniela Novembre*
Affiliation:
Dipartimento di Ingegneria e Geologia, Università degli Studi “G. D’Annunzio”, Via dei Vestini 30, 66013, Chieti, Italy
Domingo Gimeno
Affiliation:
Departamento de Geoquimica, Petrologia i Prospecció Geologica, Universitat de Barcelona, 08028, Barcelona, Spain
*
*E-mail address of corresponding author: [email protected]
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Abstract

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In recent years KAlSiO4 polymorphs have become minerals of interest from an industrial point of view; they have various applications in technological and medical fields. The costs of synthesis processes are often significant and so, in the present study, an attempt was made to develop a new synthesis protocol using a widely available and inexpensive, natural starting material. The KAlSiO4 polymorphs synthesized here were kalsilite and KAlSiO4-01 — 01 refers to the high-temperature polymorph of KAlSiO4 (Cook et al., 1997; Gregorkiewitz et al., 2008; Kremenovic et al., 2013). KAlSiO4 polymorphs were synthesized using kaolin; the effects of time and temperature on the synthesis process were investigated. A solid-state synthesis protocol was developed which required the mixing of the calcined kaolin with K2CO3 in stoichiometric proportions at temperatures of 700 and 800°C at atmospheric pressure. Crystallization of kalsilite at 700°C was demonstrated while that of KAlSiO4-01 was revealed at 800°C. Synthetic kaliophilite H2 was found in both of the experiments as a metastable phase. The products of synthesis were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma optical emission spectrometry (ICP-OES), infrared spectroscopy (IR), and 29Si magic-angle spinning solid-state nuclear magnetic resonance spectroscopy (29Si MAS NMR). Calculation of cell parameters (through Rietveld refinement) and the density and specific surface area of the phases synthesized was also achieved. The amount of amorphous phase in the synthesis powders was estimated by means of quantitative phase analysis using the combined Rietveld and reference intensity ratio methods. In particular, the results of the spectroscopic, chemical, and morphological characterizations are in agreement with the data available for these minerals in the literature, thus confirming the effectiveness of the experimental protocol. The quantitative phase analysis (QPA) also indicated the high purity of the powders synthesized, thus allowing for industrial applications.

Keywords

ICP-OESIRKaliophiliteKalsiliteKaoliniteSEM29Si MAS NMRSolid-state SynthesisXRD
Type
Article
Information
Clays and Clay Minerals , Volume 65 , Issue 5 , October 2017 , pp. 355 - 366
Copyright
Copyright © Clay Minerals Society 2017

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