Effect of surfactant OPD on the bioleaching of marmatite / Zhuoyue Lan in Minerals engineering, Vol. 22 N° 1 (Janvier 2009)  

Public ISBD [article]  inMinerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 10–13 Titre : Effect of surfactant OPD on the bioleaching of marmatite Type de document : texte imprimé Auteurs : Zhuoyue Lan, Auteur ; Yuehua Hu, Auteur ; Wenqing Qin, Auteur Année de publication : 2009 Article en page(s) : pp. 10–13 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Bioleaching Bacteria Sulphide ore Reaction kinetics Hydrometallurgy Index. décimale : 622 Industrie minière Résumé : The effect of surfactant o-phenylenediamine (OPD) on the bioleaching of marmatite with mixed cultures of Acidithiobacillusferrooxidans, Acidithiobacillusthiooxidans and Leptospirillumferrooxidans was examined in shaking flasks. The effect of OPD on the iron and sulfur oxidizing capacity of the bacteria was also investigated. Results show that the addition of OPD in low concentration was favorable for the bio-oxidation of elemental sulfur and had little negative effect on that of iron. Chemical analysis and EDX analysis of the leached residues reveal that zinc was selectively leached over iron. The elemental sulfur produced from the leaching reaction was not completely oxidized and dissolved only partially even in the presence of bacteria, which limited the dissolution rate of marmatite. However, the addition of OPD accelerated the oxidation of elemental sulfur in the presence of bacteria, thus enhancing the bioleaching rate of marmatite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000502 [article] Effect of surfactant OPD on the bioleaching of marmatite [texte imprimé] / Zhuoyue Lan, Auteur ; Yuehua Hu, Auteur ; Wenqing Qin, Auteur . - 2009 . - pp. 10–13. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 10–13 Mots-clés : Bioleaching Bacteria Sulphide ore Reaction kinetics Hydrometallurgy Index. décimale : 622 Industrie minière Résumé : The effect of surfactant o-phenylenediamine (OPD) on the bioleaching of marmatite with mixed cultures of Acidithiobacillusferrooxidans, Acidithiobacillusthiooxidans and Leptospirillumferrooxidans was examined in shaking flasks. The effect of OPD on the iron and sulfur oxidizing capacity of the bacteria was also investigated. Results show that the addition of OPD in low concentration was favorable for the bio-oxidation of elemental sulfur and had little negative effect on that of iron. Chemical analysis and EDX analysis of the leached residues reveal that zinc was selectively leached over iron. The elemental sulfur produced from the leaching reaction was not completely oxidized and dissolved only partially even in the presence of bacteria, which limited the dissolution rate of marmatite. However, the addition of OPD accelerated the oxidation of elemental sulfur in the presence of bacteria, thus enhancing the bioleaching rate of marmatite. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000502

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Substituent effects in kaolinite flotation using dodecyl tertiary amines / Changmiao Liu in Minerals engineering, Vol. 22 N° 9/10 (Août/Septembre 2009)  

Public ISBD [article]  inMinerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 849–852 Titre : Substituent effects in kaolinite flotation using dodecyl tertiary amines Type de document : texte imprimé Auteurs : Changmiao Liu, Auteur ; Yuehua Hu, Auteur ; Xuefeng Cao, Auteur Année de publication : 2009 Article en page(s) : pp. 849–852 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Flotation collectors Oxide ores Froth flotation Résumé : The flotation behavior of kaolinite was investigated using a series of tertiary amines (DRN, DEN, DPN and DBN). Maximum recoveries of kaolinite were 93%, 88% and 84% for DEN, DPN and DRN, respectively. The recovery for DBN was very low. On the basis of the Zeta potential and FT-IR spectra, the ionization of surface hydroxyl and the isomorphic exchange of surface ions accounts for the charging mechanisms of the kaolinite surface. The adsorption mechanism of tertiary amines onto the kaolinite surface was mainly electrostatic. We determined that the IEP of kaolinite increased from 3.4 to higher values after the interaction of kaolinite with the four tertiary amines. FT-IR spectra of kaolinite changed to include sharp peaks of tertiary amines. Inductive electronic effects and space-steric effects of –CH3, –C2H5, –C3H7 and –C7H7 bound to the N atom result in different collecting powers for the four tertiary amines. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000739 [article] Substituent effects in kaolinite flotation using dodecyl tertiary amines [texte imprimé] / Changmiao Liu, Auteur ; Yuehua Hu, Auteur ; Xuefeng Cao, Auteur . - 2009 . - pp. 849–852. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 849–852 Mots-clés : Flotation collectors Oxide ores Froth flotation Résumé : The flotation behavior of kaolinite was investigated using a series of tertiary amines (DRN, DEN, DPN and DBN). Maximum recoveries of kaolinite were 93%, 88% and 84% for DEN, DPN and DRN, respectively. The recovery for DBN was very low. On the basis of the Zeta potential and FT-IR spectra, the ionization of surface hydroxyl and the isomorphic exchange of surface ions accounts for the charging mechanisms of the kaolinite surface. The adsorption mechanism of tertiary amines onto the kaolinite surface was mainly electrostatic. We determined that the IEP of kaolinite increased from 3.4 to higher values after the interaction of kaolinite with the four tertiary amines. FT-IR spectra of kaolinite changed to include sharp peaks of tertiary amines. Inductive electronic effects and space-steric effects of –CH3, –C2H5, –C3H7 and –C7H7 bound to the N atom result in different collecting powers for the four tertiary amines. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000739

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