Repositorio Institucional de Documentos

Resumen: The aim of this study has been to analyse the mineralogical and textural transformations of a set of aluminium-rich shales of interest for refractory and ceramic uses, fired from 800 °C to 1300 °C. To that end, raw and fired samples were analysed by X-ray diffraction, transmitted light microscopy, field emission scanning electron microscopy, and transmission electron microscopy. Raw samples comprise variable proportions of illite, pyrophyllite, orthoclase, quartz, kaolinite, mixed-layer I-Sm, and organic matter. At temperatures below 800 °C, kaolinite, mixed-layer I-Sm, and organic matter are destabilized, indicating that they are the least stable phases in the firing process. Illite, pyrophyllite, and orthoclase remain until 1000 °C and show a broader stability field during firing than in natural environments. Quartz persists throughout the entire firing process, although it is partly replaced by vitreous phase. Hematite crystallizes at 900 °C. Vitrification begins at 1000 °C, marking the first significant textural change. From 1000 °C mullite starts to crystallize from the Si- and Al-rich vitreous phase. The mullite composition is not stoichiometric and probably as temperature increases Si is partially replaced by Al, Fe and Ti in the structure. Nevertheless, with the increase of the firing temperature, the mullite composition is closer to the theoretical composition and also to that of natural mullites. Furthermore its crystal thickness increases with temperature up to 70 nm.
Idioma: Inglés
DOI: 10.1016/j.clay.2017.11.025
Año: 2018
Publicado en: APPLIED CLAY SCIENCE 152 (2018), 284-289
ISSN: 0169-1317
Factor impacto JCR: 3.89 (2018)
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 73 / 293 = 0.249 (2018) - Q1 - T1
Categ. JCR: MINERALOGY rank: 4 / 29 = 0.138 (2018) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 51 / 148 = 0.345 (2018) - Q2 - T2
Factor impacto SCIMAGO: 0.99 - Geology (Q1) - Geochemistry and Petrology (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2013-46169-C2-1-P
Tipo y forma: Artículo (PostPrint)
Área (Departamento): Área Cristalografía Mineralog. (Dpto. Ciencias de la Tierra)

Debe reconocer adecuadamente la autoría, proporcionar un enlace a la licencia e indicar si se han realizado cambios. Puede hacerlo de cualquier manera razonable, pero no de una manera que sugiera que tiene el apoyo del licenciador o lo recibe por el uso que hace. No puede utilizar el material para una finalidad comercial. Si remezcla, transforma o crea a partir del material, no puede difundir el material modificado.

Exportado de SIDERAL (2019-11-26-13:40:09)


Visitas y descargas

Este artículo se encuentra en las siguientes colecciones:
Artículos