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Mineralogical and physico-chemical characterizations of clay from Keur Saër (Senegal)

Published online by Cambridge University Press:  09 July 2018

A. Mbaye
Affiliation:
Laboratoire de Chimie Minérale et Analytique, Faculté des Sciences et Techniques - Université Cheikh Anta Diop, Dakar, Sénégal
C. A. K. Diop*
Affiliation:
Laboratoire de Chimie Minérale et Analytique, Faculté des Sciences et Techniques - Université Cheikh Anta Diop, Dakar, Sénégal
B. Rhouta
Affiliation:
Laboratoire de Matière Condensée et Nanostructures (LMCN), Faculté des Sciences et Techniques Gueliz, BP 549, Université Cadi Ayyad Marrakech, Morocco
J. M. Brendle
Affiliation:
Equipe Matériaux à Porosité Contrôlée, Institut de Science des Matériaux de Mulhouse (IS2M) LRC CNRS 7228, Université de Haute Alsace, Institut Jean-Baptiste Donnet, 3b rue Alfred Werner, 68093 Mulhouse cedex, France
F. Senocq
Affiliation:
CIRIMAT, CNRS-UPS-INP, ENSIACET, 4 allée EmileMonso, BP44362, 31030, Toulouse, France
F. Maury
Affiliation:
CIRIMAT, CNRS-UPS-INP, ENSIACET, 4 allée EmileMonso, BP44362, 31030, Toulouse, France
D. P. Diallo
Affiliation:
Département de géologie, Faculté des Sciences et Techniques - Université Cheikh Anta Diop, Dakar, Sénégal

Abstract

There is interest in exploiting and developing natural resources, particularly deposits of natural clays. Senegal has several clay mineral deposits for which chemical and mineralogical compositions have been little studied. Some of these natural materials are nowadays used in pottery and ceramics. To extend applications, a better basic knowledge is required and, for this objective, the raw clay and separated <2 μm clay fraction from Keur Saër (Senegal) were subjected to chemical and mineralogical studies. Several techniques including X-ray diffraction (XRD), thermal analysis (TG-DTA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), N2 adsorption-desorption isotherms, cation exchange capacity (CEC) measurements and solid state nuclear magnetic resonance (NMR) have been used to characterize the material. It was found that the raw clay and the separated clay fraction consist of a mineral mixture in which kaolinite is the main component. 29Si and 27Al MAS-NMR spectra show the presence of silicon atoms linked to three other silicon atoms via an oxygen atom and six coordinated Al atoms. Significant increases in the specific surface area and cation exchange capacity were observed on purification, reaching a maximum of about 73.2 m2g–1 and 9.5 meq/100 g for the separated fine clay fraction while the values for the raw material were around 28.9 m2g–1 and 7.3 meq/100 g.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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