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Home > The Rheological Behavior of Kaolin Suspensions
 
The Rheological Behavior of Kaolin Suspensions
Paper Type
Contributed Paper
Title
The Rheological Behavior of Kaolin Suspensions
Author
Apinon Nuntiya* and Sitthisak Prasanphan
Email
anuntiya@chiangmai.ac.th
Abstract:
The rheological behavior of three kaolins (Narathiwat, Lampang and Ranong) having different chemical and mineral compositions were studied. The viscosity and thixotropy of kaolin suspensions were measured as a function of solid content, pH and electrolyte concentrations. From rheological measurements, it was found that the viscosity and thixotropy increased with the increasing of the solid content. The highest viscosity of Narathiwat, Lampang and Ranong kaolins showed at pH 2, 6 and 4, respectively. However, thixotropy of three kaolins tends to increase with decreased pH. Plots of Binghan yield stress against pH at different ionic strengths intersect at about pH 7.1, 6.8 and 4.0, for Narathiwat, Lampang and Ranong kaolins, respectively. These values are identified with the isoelectric point of the particle edge surface. The rheological behavior of kaolins may be explained in terms of the influence of solid content, particle size, morphology, and pH and electrolyte concentrations on particle interaction.
Start & End Page
271 - 281
Received Date
2006-02-16
Accepted Date
2006-06-27
Full Text
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Correspondence:
Author Name
* Apinon Nuntiya - Department of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Sitthisak Prasanphan - Department of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.
Keyword:
Keyword
bingham yield stress, isoelectric point, kaolin, rheological behavior, thixotropy, viscosity,
Volume
Vol.33 No.3 (SEPTEMBER 2006)