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The Influence of Acid Treatment on the Composition of Bentonite

Published online by Cambridge University Press:  01 January 2024

Zorica Vuković ,
Aleksandra Milutonović ,
Ljiljana Rožić ,
Aleksandra Rosić ,
Zoran Nedić  and
Dušan Jovanović
Zorica Vuković
Affiliation:
Institute of Chemistry, Technology and Metallurgy Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Republic of Serbia
Aleksandra Milutonović*
Affiliation:
Institute of Chemistry, Technology and Metallurgy Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Republic of Serbia
Ljiljana Rožić
Affiliation:
Institute of Chemistry, Technology and Metallurgy Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Republic of Serbia
Aleksandra Rosić
Affiliation:
Faculty of Mining and Geology, Đušina 7, Belgrade, Republic of Serbia
Zoran Nedić
Affiliation:
Faculty of Physical Chemistry, Studentski trg 12-16, 11000 Belgrade, Republic of Serbia
Dušan Jovanović
Affiliation:
Institute of Chemistry, Technology and Metallurgy Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Republic of Serbia
*
*E-mail address of corresponding author: snikolic@nanosys.ihtm.bg.ac.yu
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Abstract

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Bentonite from the ‘Bogovina’ coal mine in Serbia, was characterized. The influence of acid treatment on its composition, as well as mathematical descriptions of this influence are reported. The purpose of this work was to correlate the concentration of the acid used for the treatment with the resulting bentonite composition. X-ray diffraction (XRD), infrared spectroscopy and quantitative chemical analysis were employed to define the changes caused by acid treatment.

The contents of all the cations, except Si, decreased exponentially with increasing concentration of the HCl used for the treatment of the bentonite. This approach was tested on previously published data and was shown to be valid.

The basal reflections of smectite decreased gradually and eventually disappeared after intense treatment, while the other reflections remained in the XRD patterns of all the samples, but decreased slightly with increasing acid strength. In addition, the amount of X-ray amorphous matter formed increased rapidly with increasing acid concentration up to 4.5 M. With further increase in the acid strength, the amount of X-ray amorphous matter remained virtually constant.

Keywords

Acid TreatmentBentoniteChemical AnalysisIRXRD
Type
Correction
Information
Clays and Clay Minerals , Volume 54 , Issue 6 , December 2006 , pp. 697 - 702
Copyright
Copyright © 2006, The Clay Minerals Society

Footnotes

An erratum to this article is available online at https://doi.org/10.1007/BF03406034.

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