Do Pseudomonas Aeruginosa bacteria affect the selectivity of dolomite/francolite separation ? / A. M. Elmahdy in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 6 (11-12/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 6 (11-12/2011) . - p. 439-444 Titre : Do Pseudomonas Aeruginosa bacteria affect the selectivity of dolomite/francolite separation ? Type de document : texte imprimé Auteurs : A. M. Elmahdy, Auteur ; S. E. El-Mofty, Auteur ; Nagui A. Abdel-Khalek, Auteur ; Ayman A. El-Midany, Auteur Année de publication : 2011 Article en page(s) : p. 439-444 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Bactéries Chimie des surfaces Francolite Métabolites Phosphates Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The similarity of surface properties of dolomite and phosphate minerals leads to limited or no selectivity in their separation by flotation. Many chemical additives were tested; however, a limited success was achieved. Recently, bio-surfactants and bacteria have received much focus not only because of their environmentally friendly behaviour but also for their enhanced selectivity in different processes such as flotation. In this paper, the adsorption of Pseudomonas Aeruginosa (PA) bacteria onto francolite and dolomite was investigated. The adhesion of bacteria was studied by adsorption isotherm, zeta potential, and Fourier Transform Infra-Red (FTIR) spectroscopy to reveal the effect of bacteria on the floatability of each mineral. The proposed adsorption mechanism depends mainly on physical interaction due to Van der Waal’s, bridging, electrostatic, as well as hydrophobic forces Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12611 [article]

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Effect of oleate/bacteria interactions on dolomite separation from phosphate ore / A. M. Elmahdy in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 6/2009 (11-12/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 6/2009 (11-12/2009) . - p. 340-345 Titre : Effect of oleate/bacteria interactions on dolomite separation from phosphate ore Type de document : texte imprimé Auteurs : A. M. Elmahdy, Auteur ; Ayman A. El-Midany, Auteur ; Nagui A. Abdel-Khalek, Auteur ; S. E. El-Mofty, Auteur Année de publication : 2009 Article en page(s) : p. 340-345 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Dolomite  Apatite  'Oléate  de  sodium'  Bactéries  Bio-réduction  Bio-flottaison  'Minéraux  carbonatés'  Phosphate Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In conventional flotation, the sodium oleate is used as a collector for phosphate separation from silica. However, most of the phosphate deposits contain carbonate impurities, which deteriorate the flotation selectivity using sodium oleate. In this paper, the amenability of the carbonate separation from a sedimentary phosphate ore through bio-flotation process, as a one of various efforts to solve the carbonate problem, was tested. The interaction of two types of bacteria (Corynebacterium-diphtheriae-intermedius, CDI, and Pseudomonas aeruginosa, PA) with sodium oleate was investigated. The interaction between collector and bacteria was determined by Fourier Transform Infra-Red (FTIR) measurements, zeta potential before and after adsorption of bacteria, as well as frothing power. The results showed that bio-flotation could produce a phosphate concentrate of 0.85 % MgO and 30.2 % P2O5 with a recovery of 92 % at pH 5.5, 1.25 kg/t sodium oleate, ≥ 1 × 108 cells of CDI bacteria. The specification of such concentrate could not be obtained by the conventional flotation experiments, in absence of bacteria, under similar conditions. This means that bacteria could play a significant role as a surface modifier due to its selective adsorption onto the mineral surface as well as its interaction with collector. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6807 [article]

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Protective byproducts / Hassan Salah Aly Emira in EUROPEAN COATINGS JOURNAL (ECJ), N° 10/2007 (10/2007)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10/2007 (10/2007) . - p. 40-46 Titre : Protective byproducts : Steelmaking waste can be converted to anticorrosive pigments Type de document : texte imprimé Auteurs : Hassan Salah Aly Emira, Auteur ; F. F. Abdel-Mohsen, Auteur ; Nagui A. Abdel-Khalek, Auteur Année de publication : 2007 Article en page(s) : p. 40-46 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Corrosion protection - Iron wastes generated by a plant in egypt were washed and purified, then finely ground and tested as anticorrosive pigments in paints based on chlorinated rubber. Tests on the pigments and the paints show that these treated waste materials can be used effectively as anticorrosive pigments and in magnetic applications. En ligne : https://drive.google.com/file/d/1VWs-irNxTpFZNdHDnur7epO7QoR7eML6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8209 [article]

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Recycled rust protection / Hassan Salah Aly Emira in EUROPEAN COATINGS JOURNAL (ECJ), N° 4/2011 (04/2011)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4/2011 (04/2011) . - p. 118-121 Titre : Recycled rust protection : Iron waste powders studied for possible use in protective coatings Type de document : texte imprimé Auteurs : Hassan Salah Aly Emira, Auteur ; Nagui A. Abdel-Khalek, Auteur Année de publication : 2011 Article en page(s) : p. 118-121 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosion Caoutchouc chloré Epoxydes Paraffines chlorées Pigments Polyalkydes Revêtements protecteurs Urethanes Index. décimale : 667.9 Revêtements et enduits Résumé : Waste powders consisting mainly of impurities generated during the recycling of steel in Egypt were tested both in their initial state and after removal of hazardous substances as anticorrosive pigments. Reasonable protection against corrosion was obtained, but the alkalinity of the product made it suitable for use only with certain binders. Note de contenu : - Possible applications include anticorrosive pigments - Two different samples are collected and purified - Test procedures outlined - Pigments are tested in three binder systems - Effective corrosion resistance can be obtained - Reaction of powders with some binders limits use En ligne : https://drive.google.com/file/d/1lla2aU3Rzrh8LLINERv9S8lokqjfuxSV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11168 [article]

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