| Titre : | Modeling the sodium recovery resulting from using concentrated caustic for boehmite dissolution (2011) |
| Auteurs : | Lenna A. Mahoney, Auteur ; Brian M. Rapko, Auteur ; Philip P. Schonewill, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 50 N° 20, Octobre 2011) |
| Article en page(s) : | pp. 11570-11575 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | 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 |
