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      Elaboration and characterization of mullite-anorthite-albite porous ceramics prepared from Algerian kaolin Translated title: Elaboração e caracterização de cerâmicas porosas de mulita-anortita-albita preparadas a partir de caulim argelino

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          Abstract

          Abstract Mullite-anorthite-albite porous ceramic materials were successfully prepared by a solid-state reaction between kaolin clay and two different additives (CaCO3 and Na2CO3). The starting raw material was characterized by X-ray fluorescence, X-ray diffraction (XRD) and dynamic light scattering techniques. The effect of CaCO3 and Na2CO3 concentration (10 to 70 wt%) on structure, morphology and thermal properties of the obtained ceramics was investigated by XRD, scanning electron microscopy and differential scanning calorimetry (DSC) techniques. The XRD patterns showed that mullite (3Al2O3.2SiO2), anorthite (CaO.Al2O3.2SiO2) and albite (Na2O.Al2O3.6SiO2) were the main crystalline phases present in the materials. The morphology investigation revealed the porous texture of obtained ceramics characterized by the presence of sponge-like structure mainly due to the additive decomposition at high temperatures. The DSC results confirm the presence of four temperature regions related to the kaolin thermal transformations and the formation of minerals. The temperature and enthalpy of mineral formation are additive concentration dependent. As a result, the optimal content of additives which allowed the coexistence of the three phases, a sponge-like morphology, and high porosity without cracks corresponded to 15 wt% CaCO3, 15 wt% Na2CO3, and 70 wt% kaolin.

          Translated abstract

          Resumo Materiais cerâmicos porosos de mulita-anortita-albita foram preparados com sucesso por reação no estado sólido entre argila caulinítica e dois aditivos (CaCO3 e Na2CO3). A matéria-prima foi caracterizada por técnicas de fluorescência de raios X, difração de raios X (DRX) e dispersão de luz dinâmica. O efeito da concentração de CaCO3 e Na2CO3 (10 a 70% em massa) na estrutura, morfologia e propriedades térmicas das cerâmicas obtidas foi investigado por técnicas de DRX, microscopia eletrônica de varredura e calorimetria de varredura diferencial (DSC). A análise de DRX mostrou que mulita (3Al2O3.2SiO2), anortita (CaO.Al2O3.2SiO2) e albita (Na2O.Al2O3.6SiO2) foram as principais fases cristalinas presentes nos materiais. A investigação da morfologia revelou textura porosa das cerâmicas obtidas, caracterizadas pela presença de estrutura tipo esponja principalmente devido à decomposição dos aditivos em altas temperaturas. Os resultados de DSC confirmaram a presença de quatro regiões de temperatura relacionadas às transformações térmicas do caulim e à formação de minerais. A temperatura e a entalpia da formação de minerais são dependentes da concentração de aditivos. Como resultado, o conteúdo ótimo de aditivos que permitiu a coexistência das três fases, morfologia na forma de esponja e alta porosidade sem trincas correspondeu a 15% CaCO3, 15% Na2CO3 e 70% caulim.

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          Most cited references 38

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          Appl. Clay Sci.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo, SP, Brazil )
                0366-6913
                1678-4553
                March 2018
                : 64
                : 369
                : 126-132
                Affiliations
                Guelma Guelma orgnameUniversité 8-Mai-1945 Guelma orgdiv1Faculty of Sciences and Technology orgdiv2Department of Chemical Engineering Algeria fatirouabhi@ 123456yahoo.fr
                Article
                S0366-69132018000100126
                10.1590/0366-69132018643692297

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 39, Pages: 7
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