AMEUR Ouali

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AMEUR Ouali

والي عامر

ameur.ouali@univ-msila.dz

06 62 27 79 19

  • Departement of Physics
  • Faculty of Sciences
  • Grade Prof
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About Me

Education

Grade de professeur. in Université Med oudiaf de M'sila

Research Domains

Matériaux céramiques Cristallographie Alliages d'aluminium

Location

Msila, Msila

Msila, ALGERIA

Code RFIDE

  • 2024-10-01
  • 2024-10-01

    Investigating the thermal behavior and dehydroxylation kinetics of bentonite: isothermal and non-isothermal study.

    This paper aims to study the crystallization kinetics of local bentonite taken from the Maghnia region of Algeria after conducting the toasting process to powder with different temperature degrees 200, 400, 500, 700, 800, 900, 1000°C and 1100°C. The material was examined by differential thermal analysis (DTA) at different heating rates (10–50°C/min), and X ray diffraction (XRD). We used also Infrared Spectroscopy to detect the vibrations characteristic of the chemical bonds and to analyze the molecules forming the material. Scanning electron Microscopy (SEM) has been used to investigate the bentonite microstructure revealing granules shape and distribution. We have applied Non-isothermal crystallization kinetic methods to study the mechanism of crystallization in the bentonite. After a calcinations process at 200°C and 700°C of the bentonite, X-ray diffraction data showed a decrease in the basal spacing (d001) from 12.72 Å of room temperature to about 11.98 Å and 9.93 Å respectively. We also observed the disappearance of the diffraction peaks represented by the d001 interval, which expresses the montmorillonite phase after calcination of samples at 800°C. The average activation energy has been determined by Kissinger method (221.046 kJ/mol), Ozawa method (225.557 kJ/mol) and Boswell method (229.356 kJ/mol). Growth morphology parameters and the frequency factor for the reaction of the dehydroxylation at different temperatures have been measured.

    Citation

    AMEUR Ouali , , (2024-10-01), Investigating the thermal behavior and dehydroxylation kinetics of bentonite: isothermal and non-isothermal study., High Temperatures - High Pressures, Vol:53, Issue:4, pages:289, OLD CITY PUBLISHING INC

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  • 2018-01-11
  • 2018-01-11

    Synthesis and thermal behavior of cordierite ceramics from Algerian kaolin and magnesium oxide

    Kaolin DD1 (from Djebel Debbagh, Guelma, Algeria), kaolin Tamazarte KT (from Jijel, Algeria) and magnesium oxide MgO mixtures with relative weight ratios of 59/29/12 have been studied in this work in order to obtain cordierite ceramics with the stoichiometric formula (2MgO·2Al2O3·5SiO2), by mixing raw materials abundant in Algeria. Thermogravimetric analysis and differential thermal analysis were carried out on powder from room temperature to 1300 ◦C, at heating rates from 10 to 50 ◦Cmin−1. The phases and their transformations were determined by X-ray diffraction for the mixture of kaolin (59 wt.% DD1 + 29 wt.% KT) and 12 wt.% of magnesium oxide powder treated at different temperatures between 900 and 1250 ◦C for 2 h. The activation energies of α-cordierite formation calculated from isothermal data were around 372 kJmol−1. The average Avrami parameter is found to be around 1.95 for each heating rate.

    Citation

    Foudil SAHNOUNE , AMEUR Ouali , djaida redaoui, N Saheb, , (2018-01-11), Synthesis and thermal behavior of cordierite ceramics from Algerian kaolin and magnesium oxide, Acta Phys Pol A, Vol:134, Issue:1, pages:71-74, POLISH ACAD SCIENCES INST PHYSICS

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