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Síntesis hidrotermal de zeolita a partir de ceniza volante tipo F: Influencia de la temperatura

Authors: Goñi Elizalde, Sara; Peña Penilla, Raúl; Guerrero Bustos, Ana María;

Síntesis hidrotermal de zeolita a partir de ceniza volante tipo F: Influencia de la temperatura

Abstract

[ES] En este trabajo se presenta el papel que juega la temperatura durante el tratamiento hidrotermal en medio alcalino para convertir una ceniza volante de bajo contenido en cal (clase F, según la norma ASTM) en zeolita. Durante este tratamiento a la temperatura de 100 ºC se forma zeolita Na-P1 tipo gismondina (Na6Al6Si10O32.12H2O); al elevar la temperatura a 200 ºC, dicha zeolita se transforma en zeolita analcima C (Na(Si2Al)O6H2O) y en fase sodalita (1.08 Na2O.Al2O3.1.68SiO2.1.8H2O) junto con trazas de tobermorita-11Å (Ca5(OH)2Si6O16.4H2O). A esta temperatura y en estas condiciones se ha conseguido un 100% de reacción. Un estudio equivalente se ha llevado a cabo empleando agua como medio de referencia. La conversión de ceniza volante en zeolita se ha caracterizado mediante técnicas, como difracción de Rayos X (DRX), espectroscopia infrarroja por transformada de Fourier (FTIR) y análisis térmico (TG/ATD); asimismo los cambios en el área superficial se han llevado a cabo mediante la técnica BET-N2.

[EN] The influence of temperature of alkaline hydrothermal treatment on the conversion in zeolite of Spanish coal low calcium-fly ash (ASTM class F) is presented in this work. Zeolite Na-P1 gismondine type (Na6Al6Si10O32.12H2O) was formed at the temperature of 100 ºC, which transformed in zeolite; analcime-C type (Na(Si2Al)O6H2O) and sodalite (1.08 Na2O.Al2O3.1.68SiO2.1.8H2O) at 200 ºC together with traces of tobermorite-11Å (Ca5(OH)2Si6O16. 4H2O). At this temperature the 100% of the fly ash reaction was allowed. An equivalent study was carried out in water as reference. The zeolite conversion of the fly ash was characterized by X ray diffraction (XRD), FT infrared (FTIR) spectroscopy, surface area (BET-N2) and thermal analyses

Los autores agradecen la financiación por parte de la Comisión Interministerial de Ciencia y Tecnología mediante la concesión del proyecto PB98-0516 para la realización de estos trabajos.

10 páginas, 4 figuras, 1 tabla.

Peer reviewed

Keywords

Zeolitas, XRD, DRX, Análisis térmico, Zeolites, Tratamiento hidrotermal, Hydrothermal treatment, Thermal analysis, Wastes, Residuos

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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