USO DE LA ESPECTROSCOPIA IR PARA ESTUDIAR LA TRANSFORMACIÓN TÉRMICA QUE EXPERIMENTA UNA ARCILLA CAOLINÍTICA (USING IR SPECTROSCOPY TO STUDY THE THERMAL TRANSFORMATION EXPERIENCED BY A KAOLINITIC CLAY)
USO DE LA ESPECTROSCOPIA IR PARA ESTUDIAR LA TRANSFORMACIÓN TÉRMICA QUE EXPERIMENTA UNA ARCILLA CAOLINÍTICA (USING IR SPECTROSCOPY TO STUDY THE THERMAL TRANSFORMATION EXPERIENCED BY A KAOLINITIC CLAY)
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Para potenciar el uso de la materia prima local (La Tetilla, Cauca) es necesario conocer más sus características estructurales y su comportamiento frente a ciertos tratamientos, entre ellos los térmicos. En este trabajo se empleó la espectroscopia IR para estudiar las transformaciones que experimenta una arcilla caolinítica local al tratarla térmicamente. Utilizando un método de deconvolución de bandas para analizar ciertas regiones de los espectros y el concepto de área integrada, se encontró que el sólido experimentaba una transformación importante entre 500 y 700 °C, condición que se hizo evidente por la reducción del área integrada de las bandas características del caolín (~3629 y ~3695 cm-1) y de las que se pueden asociar a los enlaces Al-OH (~910 cm-1) y Si-O-Al (~532 cm-1), así como por el incremento de los grupos OH exteriores a la estructura (~3465 cm-1) y del enlace Si-O-Si (~470 cm-1).
Abstract: To promote the use of local raw materials (La Tetilla, Cauca) it is necessary to know more about their structural features and their response to certain treatments, including thermal treatments. In this work, a local raw material (La Tetilla, Cauca) was thermally treated and its behavior was studied with IR spectroscopy. Using a deconvolution band method and the integrated area concept to treat the results, we can describe the structural transformation of this clay that contained kaolin. The results of IR spectroscopy showed that the solid presented an important transformation between 500 y 700 °C. This process was determined because in this temperature range the integrated area of the bands associated to kaolin (~3629 and ~3695 cm-1), and to Al-OH (~910 cm-1) and Si-O-Al (~532 cm-1) decreased. On the other hand, in this range the surface OH (~3465 cm-1) and Si-O-Si bonds (~470 cm-1) increased.
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