Rheological properties of acid-activated bentonite dispersions
Liang, Hu-Nan (Nanjing Forestry University. Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology)
Long, Zhu (Jiangnan University. Ministry of Education. Key Laboratory of Eco-Textiles)
Zhang, Hui (Nanjing Forestry University. Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology)
Yang, Shu-Hui (Jiangnan University. Ministry of Education. Key Laboratory of Eco-Textiles)

Date:	2010
Abstract:	Acid-activated bentonites are utilized in many applications, including those that depend on their rheological properties and behavior, but little information is available regarding the rheological characteristics of this important industrial material. The purpose of this study was to investigate the effects of solids concentration, salt concentration, and pH value on the shear rate, shear stress, and other flow parameters of acid-activated bentonite suspensions. Activated Na-bentonite was prepared using sulfuric acid. Flow curves of the suspensions were modeled using the Herschel-Bulkley equation, which performed well for this system. The Herschel-Bulkley yield stress increased with the solids concentration and showed a maximum and minimum at the NaCl concentrations of 0. 001 M and 0. 01 M, respectively, and increased again slightly with further increases in NaCl concentration. The yield stress was at a maximum and a minimum at pH values of ~5 and ~7, respectively, followed by a slight increase with pH under alkaline conditions. The variations in dispersion rheological properties can be attributed to the change in the particle-association modes under different conditions.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Acid-activated Bentonite ; Herschel-Bulkley Model ; NaCl Concentration ; Ph ; Solids ; Concentration
Published in:	Clays and Clay Minerals, Vol. 58, Núm. 3 (2010) , p. 311-317, ISSN 1552-8367

DOI: 10.1346/CCMN.2010.0580302

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