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Hedfi I.,Center National des Recherchesen Science des Materiaux | Hamdi N.,Center National des Recherchesen Science des Materiaux | Rodriguez M.A.,CSIC - Institute of Ceramics and Glass | Srasra E.,Center National des Recherchesen Science des Materiaux
Desalination and Water Treatment | Year: 2015

The objective of this study was to prepare low-cost macroporous ceramic membranes using natural kaolin and natural lignite, as porogen agent, both from Tunisia. The characteristics of this membrane have been defined to be used in filtration processes and as a support for multilayer ceramic membranes. This study includes the characterization of the raw materials in order to define optimal processing parameters to obtain the membranes. A study of the effect of lignite content has been carried out. Porosity, density and mechanical strength were the considered parameters to be optimized. A lignite percentage of 20% and a sintering temperature of 1,050°C were chosen. Obtained membranes show good porosity above 43% but with a slightly low mechanical strength that does not exceed 20 MPa. These membranes can be considered as efficient regarding the results shown in the gas permeation tests. © 2015 Balaban Desalination Publications. All rights reserved. Source


Hedfi I.,Center National des Recherchesen Science des Materiaux | Hamdi N.,Center National des Recherchesen Science des Materiaux | Rodriguez M.A.,CSIC - Institute of Ceramics and Glass | Srasra E.,Center National des Recherchesen Science des Materiaux
Ceramics International | Year: 2016

The manufacturing of low cost ceramic flat and tubular membranes via dry pressing and extrusion, using low cost material, namely, natural kaolin, Alumina, and lignite as a pore forming agent was the purpose in this study. These membranes are designed to be used as a support for multilayer ceramic membranes. This study includes the preparation and the characterization of the different membranes. The selected composition was 20% of lignite, 15% of Alumina and 65% of Kaolin, the membranes have been obtained at 1200 °C as a sintering temperature. The membranes show good behavior for both configurations, with a porosity above 36% and a mechanical strength of 39 MPa or the tubular membranes and 34% for the flat ones. © 2015 Elsevier Ltd and Techna Group S.r.l. Source

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