Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions

The sintering behaviour of a pyrophyllite clay has been investigated. The mineralogical composition by X-ray diffraction (XRD) of this sample was ∼35 wt.% pyrophyllite, ∼25 wt.% sericite/illite, ∼15 wt.% kaolinite and ∼20 wt.% quartz. The chemical composition was consistent with these results, with...

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Detalles Bibliográficos
Autores: Sánchez-Soto, Pedro José, Garzón Garzón, Eduardo, Pérez-Villarejo, L., Eliche-Quesada, Dolores
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/255364
Acceso en línea:http://hdl.handle.net/10261/255364
Access Level:acceso abierto
Palabra clave:Pyrophyllite
Sericite
Sintering
Vitrification
Activation energy
Mullite
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oai_identifier_str oai:digital.csic.es:10261/255364
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
Sinterización de una arcilla que contiene pirofilita, sericita y caolinita como materia prima cerámica: buscando las condiciones óptimas de cocción
title Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
spellingShingle Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
Sánchez-Soto, Pedro José
Pyrophyllite
Sericite
Sintering
Vitrification
Activation energy
Mullite
title_short Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
title_full Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
title_fullStr Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
title_full_unstemmed Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
title_sort Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions
dc.creator.none.fl_str_mv Sánchez-Soto, Pedro José
Garzón Garzón, Eduardo
Pérez-Villarejo, L.
Eliche-Quesada, Dolores
author Sánchez-Soto, Pedro José
author_facet Sánchez-Soto, Pedro José
Garzón Garzón, Eduardo
Pérez-Villarejo, L.
Eliche-Quesada, Dolores
author_role author
author2 Garzón Garzón, Eduardo
Pérez-Villarejo, L.
Eliche-Quesada, Dolores
author2_role author
author
author
dc.contributor.none.fl_str_mv Junta de Andalucía
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Pyrophyllite
Sericite
Sintering
Vitrification
Activation energy
Mullite
topic Pyrophyllite
Sericite
Sintering
Vitrification
Activation energy
Mullite
description The sintering behaviour of a pyrophyllite clay has been investigated. The mineralogical composition by X-ray diffraction (XRD) of this sample was ∼35 wt.% pyrophyllite, ∼25 wt.% sericite/illite, ∼15 wt.% kaolinite and ∼20 wt.% quartz. The chemical composition was consistent with these results, with a total flux content of 4.18 wt.%. Prismatic bars were prepared by dry pressing using this sample and fired in the range 800–1500 °C with 0.5–5 h of soaking times. Sintering diagrams were obtained using the results of linear firing shrinkage, water absorption capacity, bulk density and apparent porosity determined in the ceramic bodies as a function of firing temperatures. It was found a trend of slight variations of bulk density values firing in the range 1000–1150 °C, with marked decreases of these values for these bodies fired at 1200 °C and 1300 °C. The temperature of maximum bulk density was determined as ∼1200 °C and the vitrification temperature was ∼1300 °C where the apparent porosity becomes almost zero. The vitrification process of the pyrophyllite clay sample was investigated using a method previously described in the literature, which considered an Arrhenius approach under isothermal conditions and a first order kinetic. It was determined an activation energy (Ea) of ∼45 kJ/mol with a linear correlation coefficient of 0.998. The relative rates of vitrification were calculated. It was found that the contribution of vitrification due to the heating was relatively small compared to the vitrification during soaking. Mullite and quartz are forming the ceramic bodies besides a vitreous or glassy phase. The thermally treated pyrophyllite clay showed a dense network of rod-shaped and elongated needle-like crystals, being characteristic features of mullite as a dense felt. The vitrification rate equation, as deduced in this study by first time, can be a useful tool to estimate the optimum firing conditions of the pyrophyllite clays applied as ceramic raw materials.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/255364
url http://hdl.handle.net/10261/255364
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.bsecv.2021.09.001
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422990389673984
spelling Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditionsSinterización de una arcilla que contiene pirofilita, sericita y caolinita como materia prima cerámica: buscando las condiciones óptimas de cocciónSánchez-Soto, Pedro JoséGarzón Garzón, EduardoPérez-Villarejo, L.Eliche-Quesada, DoloresPyrophylliteSericiteSinteringVitrificationActivation energyMulliteThe sintering behaviour of a pyrophyllite clay has been investigated. The mineralogical composition by X-ray diffraction (XRD) of this sample was ∼35 wt.% pyrophyllite, ∼25 wt.% sericite/illite, ∼15 wt.% kaolinite and ∼20 wt.% quartz. The chemical composition was consistent with these results, with a total flux content of 4.18 wt.%. Prismatic bars were prepared by dry pressing using this sample and fired in the range 800–1500 °C with 0.5–5 h of soaking times. Sintering diagrams were obtained using the results of linear firing shrinkage, water absorption capacity, bulk density and apparent porosity determined in the ceramic bodies as a function of firing temperatures. It was found a trend of slight variations of bulk density values firing in the range 1000–1150 °C, with marked decreases of these values for these bodies fired at 1200 °C and 1300 °C. The temperature of maximum bulk density was determined as ∼1200 °C and the vitrification temperature was ∼1300 °C where the apparent porosity becomes almost zero. The vitrification process of the pyrophyllite clay sample was investigated using a method previously described in the literature, which considered an Arrhenius approach under isothermal conditions and a first order kinetic. It was determined an activation energy (Ea) of ∼45 kJ/mol with a linear correlation coefficient of 0.998. The relative rates of vitrification were calculated. It was found that the contribution of vitrification due to the heating was relatively small compared to the vitrification during soaking. Mullite and quartz are forming the ceramic bodies besides a vitreous or glassy phase. The thermally treated pyrophyllite clay showed a dense network of rod-shaped and elongated needle-like crystals, being characteristic features of mullite as a dense felt. The vitrification rate equation, as deduced in this study by first time, can be a useful tool to estimate the optimum firing conditions of the pyrophyllite clays applied as ceramic raw materials.En el presente trabajo se ha estudiado el comportamiento de sinterización de una arcilla con pirofilita que posee una composición mineralógica (% en peso), deducida por difracción de rayos X, de ∼35% de pirofilita, ∼25% de sericita/illita, ∼15% de caolinita y ∼20% de cuarzo. La composición química fue consistente con estos resultados y mostró un contenido total de fundentes de 4,18% en peso. Se prepararon probetas conformadas como barras prismáticas mediante prensado uniaxial, en seco, de la muestra original para estudiar su comportamiento en cuanto a sinterización en el intervalo de temperaturas 800-1.500 °C, con tiempos de permanencia desde 0,5 a 5 h. Se obtuvieron los diagramas de sinterización utilizando los resultados de contracción lineal por cocción, capacidad de absorción de agua, densidad y porosidad aparente determinadas en las probetas tratadas térmicamente en función de la temperatura. Se ha encontrado una tendencia a presentar variaciones no muy importantes de los valores de densidad de las probetas cerámicas en el intervalo 1.000-1.150 °C, con un marcado descenso de estos valores cuando se trataron térmicamente a 1.200 °C y 1.300 °C. La temperatura del máximo de densidad se produce a ∼1.200 °C y la temperatura de vitrificación ∼1.300 °C, a la cual la porosidad aparente llega a alcanzar valores casi nulos. El proceso de vitrificación de esta arcilla con pirofilita se ha investigado utilizando una metodología descrita en la bibliografía que considera una aproximación de tipo Arrhenius, bajo condiciones isotérmicas, y una cinética de primer orden. Con la aplicación de dicha metodología se determinó una energía de activación Ea ∼ 45 kJ/mol y un coeficiente de correlación lineal de 0,998. Se calcularon las velocidades relativas de vitrificación durante el tiempo de permanencia a varias temperaturas. Con la realización de este análisis se encontró que la contribución de la vitrificación debida al tratamiento térmico es relativamente pequeña comparada con la vitrificación originada por el tiempo de permanencia a cada temperatura. En las fases cristalinas, la mullita y el cuarzo constituyen los cuerpos cerámicos obtenidos, además de la fase vítrea. Esta materia prima sometida a tratamiento térmico dio lugar a un denso entramado reticular de cristales alargados, formando agujas características, de mullita como denso fieltro. La ecuación de velocidad de vitrificación que se ha deducido en este estudio, por primera vez, puede ser una herramienta de cierta utilidad para estimar las condiciones óptimas de cocción al emplear este tipo de arcillas con pirofilita y sericita como materias primas cerámicas.Peer reviewedElsevierJunta de AndalucíaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202120212021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/255364reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.bsecv.2021.09.001Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2553642026-05-22T06:33:51Z
score 15,811543

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