Cerâmica (Sep 2007)
Características e efeito da fração granulométrica < 2 µm no comportamento de queima de uma argila Characteristics and effect of the granulometric fraction < 2 µm on the firing behavior of a clay
Abstract
Este trabalho tem por objetivo caracterizar a chamada "fração argila", isto é, com fração granulométrica This work has for objective to characterize the so-called "clay fraction", i.e., that fraction with particle size < 2 µm, and to evaluate by dilatometry, thermogravimetric and differential thermal analysis, and X-Ray diffraction, its effect on the firing behavior of a sedimentary kaolinitic clay. The "clay fraction" sample was obtained by the sedimentation technique based on the Stokes law and submitted for mineralogical, chemical and morphological characterization by X-Ray diffraction, X-Ray fluorescence and transmission electron microscopy. The results showed that the clay's granulometric fraction with size < 2 µm displays a mineralogical composition formed by kaolinite, haloisite, micaceous mineral, goethite and gibbsite. During the firing, this "clay fraction" is the main responsible for the sintering of the clay body.
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