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Sinouh H.,Laboratoire Of Physico Chimie Des Materiaux Lpcm | Sinouh H.,Laboratoire Of Physico Chimie Des Materiaux Appliques | Bih L.,Laboratoire Of Physico Chimie Des Materiaux Lpcm | El Bouari A.,Laboratoire Of Physico Chimie Des Materiaux Appliques | And 4 more authors.
MATEC Web of Conferences | Year: 2013

The xSrTiO3-(1-x)NaPO3 (x = 0-0.20 mol%) glasses were prepared by the conventional melt-quenching method. The amorphous state of the samples was verified by X-ray diffraction. The glass-ceramic materials were obtained by the well known thermal controlled crystallization process. It is found that several physical properties such as the density, molar volume, and the glass transition temperature depend strongly on the chemical composition. Vickers test on the glasses showed that the micro-hardness increases with the SrTiO3 content. The structural approach of the glasses was realized by IR spectroscopy. This technique has highlighted the co-existence of different phosphate and titanium structural units in the glassy-matrix. Crystallization of the glasses was enhanced by heat treatments and followed by X-ray diffraction. A mechanism for this glass crystallization was proposed. © Owned by the authors, published by EDP Sciences, 2013.


Bounou Y.,Laboratoire Of Physico Chimie Des Materiaux Lpcm | Zakaria D.,Laboratoire Of Physico Chimie Des Materiaux Lpcm | Namr K.I.,Chouaïb Doukkali University
MATEC Web of Conferences | Year: 2013

Modeling by full factorial design is used to determine the optimal operating conditions for the pretreatment of the industrial phosphoric acid from sulfate, fluoride, organic matter, chromium and cadmium. The effects of process factors (sediment weight ratio to phosphoric acid, temperature and time reaction) on the removal of these impurities were determined and correlated to the mechanism of their elimination. The results predicted using linear model show high values of regression coefficients (R2 sulfate = 0.97, R2 fluoride = 0.97, R2 organic matter = 0.95, R 2 Cr = 0.96 and R2 Cd = 0.86) indicating good agreement with experimental data. Optimization was carried out by using desirability function by targeting the factors to desired levels for maximum removal of these impurities. The efficiencies of removal of sulfate, fluoride, organic matters, chromium and cadmium were 63%, 81%, 78%, 15% and 19% respectively, with a global desirability of 0.75. © Owned by the authors, published by EDP Sciences, 2013.

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