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The Influence of High-Concentration Na Hexametaphosphate Dispersant on the Rheological Behavior of Aqueous Kaolin Dispersions

Published online by Cambridge University Press:  01 January 2024

Francisco-José Rubio-Hernández ,
Nicolás-Marcelo Páez-Flor ,
Ana-Isabel Gómez-Merino ,
Francisco-José Sánchez-Luque ,
Reinaldo Delgado-García  and
Leonardo Goyos-Pérez
Francisco-José Rubio-Hernández*
Affiliation:
DECEM, Universidad de las Fuerzas Armadas, Sangolquí, Ecuador Departamento de Física Aplicada II, Universidad de Málaga, Spain
Nicolás-Marcelo Páez-Flor
Affiliation:
DECEM, Universidad de las Fuerzas Armadas, Sangolquí, Ecuador
Ana-Isabel Gómez-Merino
Affiliation:
Departamento de Física Aplicada II, Universidad de Málaga, Spain
Francisco-José Sánchez-Luque
Affiliation:
Departamento de Física Aplicada II, Universidad de Málaga, Spain
Reinaldo Delgado-García
Affiliation:
DECEM, Universidad de las Fuerzas Armadas, Sangolquí, Ecuador
Leonardo Goyos-Pérez
Affiliation:
DECEM, Universidad de las Fuerzas Armadas, Sangolquí, Ecuador
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Previous studies of dispersant—aqueous kaolin dispersions have indicated clearly that the concentration of the dispersant determines the type of rheological behavior. Those studies focused on the use of dispersant concentrations below the limit of saturation, ignoring what might have happened at concentrations above that limit, and the practical uses to which such information might be put. The present study examined the influence of sodium hexametaphosphate dispersant on the viscous and viscoelastic properties of aqueous kaolin dispersions when its concentration was greater than the saturation limit. A concentric-cylinders geometry sensor system (with a narrow gap between the cylinders) was used to test the rheological behavior of Na hexametaphosphate-aqueous kaolin dispersions. Aqueous kaolin dispersions were viscoplastic, thixotropic, and viscoelastic fluids. The analysis of frequency sweep tests in the linear viscoelastic limit and steady-flow curves led to the conclusion that an increase in the dispersant concentration above the limit of saturation gave way to ‘solid-like’ dispersions.

Keywords

Kaolin DispersionsNa HexametaphosphateRheology
Type
Article
Information
Clays and Clay Minerals , Volume 64 , Issue 3 , June 2016 , pp. 210 - 219
Copyright
Copyright © Clay Minerals Society 2016

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