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Rheological Properties of Acid-Activated Bentonite Dispersions

Published online by Cambridge University Press:  01 January 2024

Hu-Nan Liang ,
Zhu Long ,
Hui Zhang  and
Shu-Hui Yang
Hu-Nan Liang
Affiliation:
Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi 214122, China Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, Jiangsu Province, China
Zhu Long*
Affiliation:
Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi 214122, China
Hui Zhang
Affiliation:
Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, Jiangsu Province, China
Shu-Hui Yang
Affiliation:
Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi 214122, China
*
* E-mail address of corresponding author: longzhu@jiangnan.edu.cn
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Abstract

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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.

Keywords

Acid-activated BentoniteHerschel-Bulkley ModelNaCl ConcentrationpHSolids Concentration
Type
Article
Information
Clays and Clay Minerals , Volume 58 , Issue 3 , June 2010 , pp. 311 - 317
Copyright
Copyright © The Clay Minerals Society 2010

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