Modeling the sodium recovery resulting from using concentrated caustic for boehmite dissolution / Lenna A. Mahoney in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11570-11575 Titre : Modeling the sodium recovery resulting from using concentrated caustic for boehmite dissolution Type de document : texte imprimé Auteurs : Lenna A. Mahoney, Auteur ; Brian M. Rapko, Auteur ; Philip P. Schonewill, Auteur Année de publication : 2011 Article en page(s) : pp. 11570-11575 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Dissolution Modeling Résumé : Boehmite dissolution experiments were conducted at NaOH concentrations of 10 and 12 M to determine whether the increased aluminum solubility at high hydroxide concentration would offset the increase in added sodium, causing a decrease in the amount of sodium added during boehmite dissolution. A shrinking-core dissolution rate model with a reversible reaction was fitted to the test data. The resulting model included the effects of temperature, hydroxide concentration, and dissolved aluminum concentration. The rate was found to depend on the ~1.5 power of hydroxide molarity. When the rate model was used to simulate batch boehmite dissolution, a concentration range of 7-9 M NaOH was found to minimize the mass of sodium needed to dissolve a given mass of aluminum, potentially reducing it by as much as two-thirds. The time required to dissolve the boehmite could be decreased by using hydroxide concentrations greater than ~10 M. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612380 [article] Modeling the sodium recovery resulting from using concentrated caustic for boehmite dissolution [texte imprimé] / Lenna A. Mahoney, Auteur ; Brian M. Rapko, Auteur ; Philip P. Schonewill, Auteur . - 2011 . - pp. 11570-11575. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11570-11575 Mots-clés : Dissolution Modeling Résumé : Boehmite dissolution experiments were conducted at NaOH concentrations of 10 and 12 M to determine whether the increased aluminum solubility at high hydroxide concentration would offset the increase in added sodium, causing a decrease in the amount of sodium added during boehmite dissolution. A shrinking-core dissolution rate model with a reversible reaction was fitted to the test data. The resulting model included the effects of temperature, hydroxide concentration, and dissolved aluminum concentration. The rate was found to depend on the ~1.5 power of hydroxide molarity. When the rate model was used to simulate batch boehmite dissolution, a concentration range of 7-9 M NaOH was found to minimize the mass of sodium needed to dissolve a given mass of aluminum, potentially reducing it by as much as two-thirds. The time required to dissolve the boehmite could be decreased by using hydroxide concentrations greater than ~10 M. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612380

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