Documents disponibles écrits par cet auteur

An experimental investigation into the oxidation of four pyritic shales from Western Australia / Meining Song in Minerals engineering, Vol. 22 N° 6 (Mai 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 550–559 Titre : An experimental investigation into the oxidation of four pyritic shales from Western Australia Type de document : texte imprimé Auteurs : Meining Song, Auteur ; Dongke Zhang, Auteur Année de publication : 2009 Article en page(s) : pp. 550–559 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  rock  drainage  Environmental  Sulphide  ores  Oxidation  Ore  mineralogy Résumé : The oxidation of pyritic shale under different experimental conditions was studied using an isothermal batch reactor technique. Four pyritic shale samples collected from different areas of an iron ore mine with different stratigraphic compositions in Western Australia were employed in this study. The influence of shale properties on the oxidation of pyritic shale was studied. It was found that the reaction rate constant k (L kg−1 h−1) of the shale oxidation as measured with the present isothermal reactor technique on a per unit pyrite mass basis, was not constant for the different shales and was dependent on their physical properties, where increasing grain size and increasing encapsulation of pyrite grains both result in decreased surface exposure of pyrite to oxidation (per unit mass) which coincides with a decrease in the oxidation rate of pyritic shale (per unit mass). This study demonstrates that pyrite grain size and encapsulation are important parameters for the interpretation and evaluation of acid mine drainage potential associated with individual shales. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000089 [article] An experimental investigation into the oxidation of four pyritic shales from Western Australia [texte imprimé] / Meining Song, Auteur ; Dongke Zhang, Auteur . - 2009 . - pp. 550–559. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 6 (Mai 2009) . - pp. 550–559 Mots-clés : Acid  rock  drainage  Environmental  Sulphide  ores  Oxidation  Ore  mineralogy Résumé : The oxidation of pyritic shale under different experimental conditions was studied using an isothermal batch reactor technique. Four pyritic shale samples collected from different areas of an iron ore mine with different stratigraphic compositions in Western Australia were employed in this study. The influence of shale properties on the oxidation of pyritic shale was studied. It was found that the reaction rate constant k (L kg−1 h−1) of the shale oxidation as measured with the present isothermal reactor technique on a per unit pyrite mass basis, was not constant for the different shales and was dependent on their physical properties, where increasing grain size and increasing encapsulation of pyrite grains both result in decreased surface exposure of pyrite to oxidation (per unit mass) which coincides with a decrease in the oxidation rate of pyritic shale (per unit mass). This study demonstrates that pyrite grain size and encapsulation are important parameters for the interpretation and evaluation of acid mine drainage potential associated with individual shales. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509000089

Evaluating the behavior of electrolytic gas bubbles and their effect on the cell voltage in alkaline water electrolysis / Dongke Zhang in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13825-13832 Titre : Evaluating the behavior of electrolytic gas bubbles and their effect on the cell voltage in alkaline water electrolysis Type de document : texte imprimé Auteurs : Dongke Zhang, Auteur ; Kai Zeng, Auteur Année de publication : 2012 Article en page(s) : pp. 13825-13832 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Electrolysis  Bubble Résumé : The behavior of electrolytic gas bubbles and their effect on the cell voltage in water electrolysis were studied theoretically and experimentally. A fundamental force analysis was employed to predict the critical diameter for the departure of the electrolytic gas bubbles. Good agreement between the predictions and observations was obtained. It was found that increasing the electrode potential strengthened the force due to the interfacial tension and increased the critical diameter, while increasing the electrolyte concentration led to a reduction. This was explained by the changes in both the contact angle and surface tension. Many more fine gas bubbles were observed at high current density, which was explained by that the enhanced natural convection forced bubbles to depart prematurely. The cell voltage was only slightly reduced by the electrolyte circulation, which reduced the critical diameter for bubble departure. This confirmed that the layer of fine bubbles represented a significant energy barrier, that is, the additional resistance due to the bubble curtain formed on the electrodes, for alkaline water electrolysis. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508206 [article] Evaluating the behavior of electrolytic gas bubbles and their effect on the cell voltage in alkaline water electrolysis [texte imprimé] / Dongke Zhang, Auteur ; Kai Zeng, Auteur . - 2012 . - pp. 13825-13832. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13825-13832 Mots-clés : Electrolysis  Bubble Résumé : The behavior of electrolytic gas bubbles and their effect on the cell voltage in water electrolysis were studied theoretically and experimentally. A fundamental force analysis was employed to predict the critical diameter for the departure of the electrolytic gas bubbles. Good agreement between the predictions and observations was obtained. It was found that increasing the electrode potential strengthened the force due to the interfacial tension and increased the critical diameter, while increasing the electrolyte concentration led to a reduction. This was explained by the changes in both the contact angle and surface tension. Many more fine gas bubbles were observed at high current density, which was explained by that the enhanced natural convection forced bubbles to depart prematurely. The cell voltage was only slightly reduced by the electrolyte circulation, which reduced the critical diameter for bubble departure. This confirmed that the layer of fine bubbles represented a significant energy barrier, that is, the additional resistance due to the bubble curtain formed on the electrodes, for alkaline water electrolysis. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508206