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Crystallization of Calcium Sulfate Dihydrate in the Presence of Colloidal Silica / Fulin Wang in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11344-11350 Titre : Crystallization of Calcium Sulfate Dihydrate in the Presence of Colloidal Silica Type de document : texte imprimé Auteurs : Fulin Wang, Auteur ; Thomas E. Davis, Auteur ; Volodymyr V. Tarabara, Auteur Année de publication : 2011 Article en page(s) : pp. 11344-11350 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Crystallization Résumé : The effects of silica colloids on calcium sulfate dihydrate (gypsum, CaSO4·2H2O) crystallization are studied using feed solutions of varying degrees of supersaturation. A combination of light transmittance and electrical conductivity measurements is employed to characterize various aspects of the crystallization process. The induction time, nucleation rate, surface energy, and rate of crystallization of gypsum crystals are measured as functions of the saturation and the presence of noncrystallizing (SiO2) colloids. Scanning electron microscopy (SEM) imaging is used to characterize the morphology of formed crystals. The induction time and the rate of crystallization are both shown to increase when gypsum crystal formed from solutions containing suspended colloids. The findings are rationalized in terms of a mechanistic model that links the random motion of colloids with nucleation and crystal growth processes. The results have important implications for a variety of industrially relevant processes such as heat exchange and membrane separation and related fouling phenomena. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437830 [article] Crystallization of Calcium Sulfate Dihydrate in the Presence of Colloidal Silica [texte imprimé] / Fulin Wang, Auteur ; Thomas E. Davis, Auteur ; Volodymyr V. Tarabara, Auteur . - 2011 . - pp. 11344-11350. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11344-11350 Mots-clés : Crystallization Résumé : The effects of silica colloids on calcium sulfate dihydrate (gypsum, CaSO4·2H2O) crystallization are studied using feed solutions of varying degrees of supersaturation. A combination of light transmittance and electrical conductivity measurements is employed to characterize various aspects of the crystallization process. The induction time, nucleation rate, surface energy, and rate of crystallization of gypsum crystals are measured as functions of the saturation and the presence of noncrystallizing (SiO2) colloids. Scanning electron microscopy (SEM) imaging is used to characterize the morphology of formed crystals. The induction time and the rate of crystallization are both shown to increase when gypsum crystal formed from solutions containing suspended colloids. The findings are rationalized in terms of a mechanistic model that links the random motion of colloids with nucleation and crystal growth processes. The results have important implications for a variety of industrially relevant processes such as heat exchange and membrane separation and related fouling phenomena. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23437830