EFFECT OF THERMAL TREATMENT ON THE BENTONITE PROPERTIES

Abstract

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.

Keywords: bentonite, thermal treatment, surface properties.

REZIME

Glavni cilj ovog istraživanja je ispitati promjene u strukturi, površine i poroznosti monomineralnih djeliću lokalnih bentonita nakon zagrijavanja na 300, 500 i 650 ° C. IR spektroskopija, DTA, XRD i N₂ adsorpcione metode su uključene za analize. Nezagrijani montmorilonit karakteriše bazalni razmak od 1,50 nm, a nakon termičke obrade 0,98 nm. To smanjenje pripisuje se gubitku interlamelarne vode, koji nastaje nakon faze transformacije. Promjene kristalne strukture vezane se za smanjenje vrijednosti specifične površine i ukupne zapremine pora.

Ključne riječi: bentonit, termička obrada, površinska svojstva