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Kinetics of the acid digestion of serpentine with concurrent grinding. 2. detailed investigation and model development / Van Essendelft, Dirk T. in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9892–9901 Titre : Kinetics of the acid digestion of serpentine with concurrent grinding. 2. detailed investigation and model development Type de document : texte imprimé Auteurs : Van Essendelft, Dirk T., Auteur ; Schobert, Harold H., Auteur Année de publication : 2010 Article en page(s) : pp. 9892–9901 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Magnesium  Serpentine  Mineral  carbonation  methodology Résumé : The rapid extraction of magnesium from serpentine is critical to novel low-pressure mineral carbonation methodology. Though almost any acid can dissolve the magnesium, the rate plays a critical role in the industrialization of the process. It has been demonstrated that including a low-energy, attrition-type grinding with the chemical attack of the acid can more than double the extraction rate. In part 1 of this investigation, it was found that a model that accounts for surface reaction, surface speciation, the electrical double layer, particle size distribution, and ash layer diffusion can adequately describe the kinetics of the dissolution of serpentine with concurrent grinding. However, the model did not account for changes in temperature, concentration, and grinding energy input. We report here the model developments and changes as well as a detailed experimental investigation to provide validation for the model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005832 [article] Kinetics of the acid digestion of serpentine with concurrent grinding. 2. detailed investigation and model development [texte imprimé] / Van Essendelft, Dirk T., Auteur ; Schobert, Harold H., Auteur . - 2010 . - pp. 9892–9901. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9892–9901 Mots-clés : Magnesium  Serpentine  Mineral  carbonation  methodology Résumé : The rapid extraction of magnesium from serpentine is critical to novel low-pressure mineral carbonation methodology. Though almost any acid can dissolve the magnesium, the rate plays a critical role in the industrialization of the process. It has been demonstrated that including a low-energy, attrition-type grinding with the chemical attack of the acid can more than double the extraction rate. In part 1 of this investigation, it was found that a model that accounts for surface reaction, surface speciation, the electrical double layer, particle size distribution, and ash layer diffusion can adequately describe the kinetics of the dissolution of serpentine with concurrent grinding. However, the model did not account for changes in temperature, concentration, and grinding energy input. We report here the model developments and changes as well as a detailed experimental investigation to provide validation for the model. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9005832

Kinetics of the acid digestion of serpentine with concurrent grinding. 3. model validation and prediction / Van Essendelft, Dirk T. in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1588–1590 Titre : Kinetics of the acid digestion of serpentine with concurrent grinding. 3. model validation and prediction Type de document : texte imprimé Auteurs : Van Essendelft, Dirk T., Auteur ; Schobert, Harold H., Auteur Année de publication : 2010 Article en page(s) : pp 1588–1590 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics  Magnesium  Serpentine Résumé : The rapid extraction of magnesium from serpentine is critical to novel low-pressure mineral carbonation methodology. Although almost any acid can dissolve the magnesium, the rate plays a critical role in the industrialization of the process. As detailed in parts 1 and 2 of this study [Van Essendelft and Schobert Ind. Eng. Chem. Res. 2009, 48 (5), 2556−2565; 2009, 48 (22), 9892−9901], a computational model has been developed that explains the kinetics of the extraction of magnesium from serpentine with concurrent grinding. The model has direct ties to first principles and accounts for surface speciation and reaction, the electrical double layer, ash-layer diffusion, particle size distribution, temperature effects, and solution thermodynamics. It is desirable to demonstrate the robustness of the model and to use the model to predict useful scenarios. Presented here are experimental data obtained under various conditions not tested before and the predictions of the model under those circumstances, as well as the predictions of the model in an industrial application. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901159t [article] Kinetics of the acid digestion of serpentine with concurrent grinding. 3. model validation and prediction [texte imprimé] / Van Essendelft, Dirk T., Auteur ; Schobert, Harold H., Auteur . - 2010 . - pp 1588–1590. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1588–1590 Mots-clés : Kinetics  Magnesium  Serpentine Résumé : The rapid extraction of magnesium from serpentine is critical to novel low-pressure mineral carbonation methodology. Although almost any acid can dissolve the magnesium, the rate plays a critical role in the industrialization of the process. As detailed in parts 1 and 2 of this study [Van Essendelft and Schobert Ind. Eng. Chem. Res. 2009, 48 (5), 2556−2565; 2009, 48 (22), 9892−9901], a computational model has been developed that explains the kinetics of the extraction of magnesium from serpentine with concurrent grinding. The model has direct ties to first principles and accounts for surface speciation and reaction, the electrical double layer, ash-layer diffusion, particle size distribution, temperature effects, and solution thermodynamics. It is desirable to demonstrate the robustness of the model and to use the model to predict useful scenarios. Presented here are experimental data obtained under various conditions not tested before and the predictions of the model under those circumstances, as well as the predictions of the model in an industrial application. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901159t