Navegando por Assunto "Zeólita faujasita"

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Acesso aberto (Open Access)
Síntese de zeólita do tipo faujasita a partir de um rejeito de caulim
(2012-12) HILDEBRANDO, Edemarino Araujo; ANGÉLICA, Rômulo Simões; NEVES, Roberto de Freitas; DIAZ, Francisco Rolando Valenzuela
Zeolitic materials were synthesized using as main source of silicon and aluminum an industrial waste generated during the processing of kaolin for paper coating, the starting material and formed phases as reaction products were characterized by XRD, SEM and DRIFT. The synthesis process occurred in hydrothermal conditions and the effects, time-temperature, as well as the relations Si/Al and Na/Al were considered. The results show that in the methodology developed from kaolin waste, initially calcined at 700 ºC for 2 h, subjected then reaction in alkaline medium at 90 ºC for 48 h in presence of additional silica was obtained faujasite-type zeolite with good crystallinity as phase predominant in the synthesis product.
Acesso aberto (Open Access)
Síntese de zeólita do tipo faujasita: comparação entre caulim beneficiado e caulim flint
(Universidade Federal do Pará, 2015-06) ROCHA JUNIOR, Carlos Augusto Ferreira da; ANGÉLICA, Rômulo Simões; NEVES, Roberto de Freitas
The main purpose of this work is the synthesis of faujasite zeolite using three different kinds of kaolin from the Amazon region, Brazil: two kaolin from the beneficiation process for paper coating and hard or flint kaolin, a non-processed kaoling from the mining site. Analysis of the reaction products of kaolin showed the formation of faujasite zeolite. Flint kaolin showed a lower potential with respect to zeolitization ratio Si/Al equal to 2, compared to processed kaolins, probably related to the iron present in the structure. New results show a complete change in the formation of faujasite, which turns to be the main mineralogical phase after iron removal.