Produção Nacional
Synthesis and Characterization of Sodalite and Cancrinite from Kaolin
2017; Springer International Publishing; Linguagem: Inglês
10.1007/978-3-319-51382-9_31
ISSN2367-1181
AutoresFabiano Augusto Costa Mafra Passos, Danielle C. Castro, Karoline K. Ferreira, Karla Mayara Arguelles Simões, Luíz Carlos Bertolino, Carla Napoli Barbato, Francisco Manoel dos Santos Garrido, Adriana A. S. Felix, Fernanda Arruda Nogueira Gomes da Silva,
Tópico(s)Concrete and Cement Materials Research
ResumoCancriniteCancrinite and sodaliteSodalite are characterized by high capacity of adsorption due to its porous structure. The aim of this work was to use kaolinKaolin from Borborema-Seridó/Brazil as a source of aluminium and silicon to hydrothermal synthesisHydrothermal synthesis of sodalite and cancrinite and to evaluate the best conditions to the formation of these phases. Therefore, kaolin was heated at 700 and 900 °C for 2 h in order to transform kaolinite in metakaolin. Thereafter, experiments with the calcined kaolin's were carried out between 150 and 230 °C for 30–270 min on a stainless steel pressure vessel using NaOH, Na2CO3 and H2O. The samples were characterized by X-ray diffraction, nuclear magnetic resonance, scanning electronic microscopy, thermogravimetry, and Zeta potential. The most pure sodalite phase was obtained at 230 °C, with the kaolin/NaOH ratio of 1:1, low concentration of Na2CO3 and smaller time of synthesis (30 min). On the other hand, for the synthesis of cancrinite phase at 230 °C, it was necessary to use kaolin heated at 900 °C, a longer time of synthesis (270 min) and a higher concentration of Na2CO3.
Referência(s)