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Influence of mineral chemistry on electrokinetic and rheological behavior of aqueous muscovite dispersions / Ataollah Nosrati in Industrial & engineering chemistry research, Vol. 50 N° 19 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11087–11096 Titre : Influence of mineral chemistry on electrokinetic and rheological behavior of aqueous muscovite dispersions Type de document : texte imprimé Auteurs : Ataollah Nosrati, Auteur ; Jonas Addai-Mensah, Auteur ; William Skinner, Auteur Année de publication : 2011 Article en page(s) : pp. 11087–11096 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mineral  chemistry  Electrokinetic  rheological Résumé : The dispersion electrokinetic behavior and rheology of two mineralogically similar muscovites with subtle differences in their bulk chemistry (low-Fe versus high-Fe substitution) were investigated as functions of pH and temperature. At 25 °C, the zeta potentials of both samples were quite similar for dilute dispersions with a common isoelectric point (iep) at pH ≈ 2. For concentrated dispersions, the high-Fe-substituted particles displayed lower zeta potential and higher iep values than the low-Fe-substituted particles. The incongruent leaching of Fe(III), Al(III), Si(IV), and K+ ions from muscovite particles was facilitated by both higher Fe substitution and lower pH. Temperature elevation to 70 °C marginally enhanced the cations’ leaching rates but suppressed Si(IV) release. The yield stresses of the two dispersions were similar in the pH ranges of 4–9 and 1–9 at 25 and 70 °C, respectively, and notably characteristic of dispersed sols/weak gels. At 25 °C and pH < 3, however, the high-Fe-substituted dispersion displayed an unusually strong gel structure. In contrast, the low-Fe-substituted dispersion remained dispersed. These observations reflect the different pH- and temperature-mediated muscovite-mineral-specific leaching and pulp chemistry behaviors that prevailed under the investigated conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101548f#cor1 [article] Influence of mineral chemistry on electrokinetic and rheological behavior of aqueous muscovite dispersions [texte imprimé] / Ataollah Nosrati, Auteur ; Jonas Addai-Mensah, Auteur ; William Skinner, Auteur . - 2011 . - pp. 11087–11096. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 19 (Octobre 2011) . - pp. 11087–11096 Mots-clés : Mineral  chemistry  Electrokinetic  rheological Résumé : The dispersion electrokinetic behavior and rheology of two mineralogically similar muscovites with subtle differences in their bulk chemistry (low-Fe versus high-Fe substitution) were investigated as functions of pH and temperature. At 25 °C, the zeta potentials of both samples were quite similar for dilute dispersions with a common isoelectric point (iep) at pH ≈ 2. For concentrated dispersions, the high-Fe-substituted particles displayed lower zeta potential and higher iep values than the low-Fe-substituted particles. The incongruent leaching of Fe(III), Al(III), Si(IV), and K+ ions from muscovite particles was facilitated by both higher Fe substitution and lower pH. Temperature elevation to 70 °C marginally enhanced the cations’ leaching rates but suppressed Si(IV) release. The yield stresses of the two dispersions were similar in the pH ranges of 4–9 and 1–9 at 25 and 70 °C, respectively, and notably characteristic of dispersed sols/weak gels. At 25 °C and pH < 3, however, the high-Fe-substituted dispersion displayed an unusually strong gel structure. In contrast, the low-Fe-substituted dispersion remained dispersed. These observations reflect the different pH- and temperature-mediated muscovite-mineral-specific leaching and pulp chemistry behaviors that prevailed under the investigated conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101548f#cor1