Resumo

VILLAQUIRAN-CAICEDO, Mónica Alejandra; MEJIA-DE GUTIERREZ, Ruby; GORDILLO-SUAREZ, Marisol  e  CONSTANZA-GALLEGO, Nidia. Production of Low-Silica Zeolites from Colombian Kaolin. Ing. invest. y tecnol. [online]. 2016, vol.17, n.1, pp.109-118. ISSN 2594-0732.

This paper presents a study of the production of a synthetic zeolite of low-silica content by hydrothermal synthesis from Colombian kaolin. The statistical technique Response-Surface Methodology was used to find the optimum process conditions (i.e., molar ratios Na2O/SiO2 and H2O/Al2O3, time and temperature) and to ensure the quality of the zeolites obtained. The cation exchange capacity and the degree of crystallinity were used as response variables. The cation exchange capacity was determined following Standard NTC 5167. The mineralogical composition and microstructure of the zeolites produced were characterized through the application of scanning electron microscopy, X-ray diffraction and nuclear magnetic resonance. The results indicate that it is possible to obtain a good quality synthetic zeolite from the Colombian kaolin evaluated. A zeolite type A with a cation exchange capacity of 442 cmol/Kg, a value higher than that exhibited by the same type of zeolite imported for applications in the Colombian industry (i.e., 408 cmol/Kg), was obtained with the following processing conditions: molar ratios Na2O/SiO2 of 2.7, H2O/Al2O3 of 150, at temperature 66°C and processing time of 8 hours; yielded.

Palavras-chave : cation exchange capacity; hydrothermal synthesis; metakaolin; response surface methodology; zeolite A.

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