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Investigation of the dissolution kinetics of meta - kaolin in H2SO4 solution / Mehmet Riza Altiokka in Industrial & engineering chemistry research, Vol. 49 N° 24 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12379–12382 Titre : Investigation of the dissolution kinetics of meta - kaolin in H2SO4 solution Type de document : texte imprimé Auteurs : Mehmet Riza Altiokka, Auteur ; Handan Akalin, Auteur ; Nergis Melek, Auteur Année de publication : 2011 Article en page(s) : pp. 12379–12382 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : kinetics Résumé : Kaolin with a given size distribution was calcined at 1023 K for 2 h then digested in 3.0, 4.5, and 6.0 N sulfuric acid at constant temperatures within the range 328−358 K. The samples taken from the solution at predetermined time intervals were analyzed by using a complexometric method and the amount of aluminum passed into the solution was determined. The results showed that the dissolution kinetics follow the shrinking core model for spherical particles of unchanging size, t/τ = 1 − (1 − xB)1/3, with the apparent activation energy of 98.4 kJ/mol. The leaching reaction was found to be the 0.75th order with respect to acid concentration and controlled by reaction step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101147n [article] Investigation of the dissolution kinetics of meta - kaolin in H2SO4 solution [texte imprimé] / Mehmet Riza Altiokka, Auteur ; Handan Akalin, Auteur ; Nergis Melek, Auteur . - 2011 . - pp. 12379–12382. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 24 (Décembre 2010) . - pp. 12379–12382 Mots-clés : kinetics Résumé : Kaolin with a given size distribution was calcined at 1023 K for 2 h then digested in 3.0, 4.5, and 6.0 N sulfuric acid at constant temperatures within the range 328−358 K. The samples taken from the solution at predetermined time intervals were analyzed by using a complexometric method and the amount of aluminum passed into the solution was determined. The results showed that the dissolution kinetics follow the shrinking core model for spherical particles of unchanging size, t/τ = 1 − (1 − xB)1/3, with the apparent activation energy of 98.4 kJ/mol. The leaching reaction was found to be the 0.75th order with respect to acid concentration and controlled by reaction step. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101147n