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Original scientific article

EFFECT OF THERMAL TREATMENT ON THE BENTONITE PROPERTIES

By
Zuzana Orolínová ,
Zuzana Orolínová

Institute of Geotechnics, Slovak Academy of Sciences Košice, Košice, Slovakia

Annamária Mockovčiaková ,
Annamária Mockovčiaková

Institute of Geotechnics, Slovak Academy of Sciences Košice, Košice, Slovakia

Silvia Dolinská ,
Silvia Dolinská

Institute of Geotechnics, Slovak Academy of Sciences Košice, Košice, Slovakia

Jaroslav Briančin
Jaroslav Briančin

Institute of Geotechnics, Slovak Academy of Sciences Košice, Košice, Slovakia

Abstract

The main objective of this study is to investigate the changes in structure, surface area and porosity of monomineral fraction of the local bentonite upon heating at 300, 500 and 650 °C. IR spectroscopy, DTA, XRD and N2 adsorption method were employed for the analyses. The non-heated montmorillonite was characterized by a basal spacing of 1.50 nm, after thermal treatment of 0.98 nm. This decrease was attributed to the loss of interlamellar water, finally a phase transformation occured. Changes of the crystal structure related with the decrease of the value of specific surface area and total pore volume.

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