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Abstract
Zeolite A was calcined at 200, 400, 600, 800 and 1000 ºC for 2h to evaluate its thermal stability. The zeolite A was synthesized using kaolin waste from kaolin processing industries for paper coating located in the Amazon region. Both zeolite A and further calcined products were characterized by X-ray diffraction analysis and scanning electron microscopy. The zeolite A structure remained stable up to 600 ºC, where only small variations in peak intensities were observed. At 800 °C the diffraction pattern still exhibited zeolite A but with the absence of some peaks. At 1000 ºC nepheline, mullite and probably sodalite were formed. The zeolite A was also heated at 900 and 950 °C to check the two exothermic peaks observed in the DTA curve. The X-ray diffraction analysis indicated the presence of nepheline, sodalite and mullite.
Keywords: kaolin waste, zeolite A, thermal stability.
Estabilidade térmica da zeólita A sintetizada a partir de
um rejeito de caulim da Amazônia
(Thermal stability of the zeolite A synthesized after kaolin
waste from Amazon region)
A. A. B. Maia1, R. S. Angélica2, R. F. Neves1
1Programa de Pós-Graduação em Engenharia Química, Universidade Federal do Pará 2Instituto de Geociências, Universidade Federal do Pará
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[Figure 1: XRD patterns of the zeolite A synthesis process.]
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[Figure 2: Morphologies of the samples kaolin wastes (a), metakaolinite (b) and zeolite A (c).]
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[Figure 3: XRD patterns of the zeolite A and of the same calcined at 200, 400, 600 and 800 ºC.]
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[Figure 4: XRD patterns of the zeolite A sample and of the same calcined at 900, 950 and 1000 °C.]
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