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Some Physicochemical Properties of the White Sepiolite Known as Pipestone From Eskişehir, Turkey

Published online by Cambridge University Press:  01 January 2024

Müşerref Önal ,
Hamza Yilmaz  and
Yüksel Sarikaya
Müşerref Önal*
Affiliation:
Department of Chemistry, Faculty of Science, Ankara University, Tandoğan, 06100 Ankara, Turkey
Hamza Yilmaz
Affiliation:
Department of Chemistry, Faculty of Science, Ankara University, Tandoğan, 06100 Ankara, Turkey
Yüksel Sarikaya
Affiliation:
Department of Chemistry, Faculty of Science, Ankara University, Tandoğan, 06100 Ankara, Turkey
*
* E-mail address of corresponding author: onal@science.ankara.edu.tr
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Abstract

Various physicochemical characteristics of a sepiolite sample from the Eskişehir area, Turkey, were investigated to help in making predictions about possible uses of the material. The sample was examined by chemical analysis (CA), thermal analysis (DTA/TGA), X-ray diffraction (XRD) analysis, particle-size analysis (PSA), linear dilatometry (LD), scanning electron microscopy (SEM), mercury porosimetry (Hg-Por.), and low-temperature nitrogen adsorption/desorption (N2-AD) techniques. The CA and XRD data indicated that the sepiolite contains only 6% dolomite by mass. The XRD patterns showed that sepiolite anhydride, enstatite, diopside, and opal-CT form upon heating the sepiolite above 600, 800, 900, and 1200°C, respectively. The maximum rate of endothermic changes in the DTA and TGA curves were observed at 82, 287, and 491°C, corresponding to the loss of external, zeolitic, and bound water from the sepiolite, respectively. Dehydroxylation and recrystallization of the sepiolite were fastest at 845°C and 862°C, respectively. The LD curve indicated that the shrinkage began at 800°C and reached 4.0% at 1000°C. The proportion of particles with diameters of <2 µm, and the external surface area of the long-term (24 h) water-treated sepiolite were determined by PSA as 79% by volume, and 8 m2g−1, respectively. The SEM view revealed discrete bundles of sepiolite fibers of various lengths. The specific surface area found from adsorption data was 316 m2g−1. The specific micro-, meso-, macro-, and total-pore volumes obtained from the combination of Hg-Por. and N2-AD results were 0.16, 0.21, 0.45, and 0.82 cm3g−1, respectively. The average macropore and micro-mesopore radii in the sepiolite were estimated (using the Hg-Por. and N2-AD data) tobe 35 and 2.4 nm, respectively.

Keywords

PorositySepioliteSurface AreaThermal AnalysisX-ray Diffraction
Type
Article
Information
Clays and Clay Minerals , Volume 56 , Issue 5 , October 2008 , pp. 511 - 519
Copyright
Copyright © The Clay Minerals Society 2009

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