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Deflocculant consumption of clay suspensions as a function of specific surface area and cation exchange capacity

Published online by Cambridge University Press:  09 July 2018

D. G. G. Delavi ,
A. De Noni Jr  and
D. Hotza
D. G. G. Delavi
Affiliation:
Graduate Program in Materials Science and Engineering (PGMAT), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil
A. De Noni Jr
Affiliation:
Graduate Program in Materials Science and Engineering (PPGCEM), University of Southernmost Santa Catarina (UNESC), 88806-000 Criciúma, SC, Brazil
D. Hotza*
Affiliation:
Graduate Program in Materials Science and Engineering (PGMAT), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil
*
*E-mail: [email protected]
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Abstract

Ceramic tile production by the wet route requires clay suspensions with a high solid content and low viscosity. In this work the deflocculation of clays in aqueous suspensions was investigated by varying the type of clay and additive. Three kaolinitic and two illitic clays were characterized and dispersed with deflocculants based on lithium, sodium and potassium silicates and polyacrylates. The clays were characterized by chemical and mineralogical analyses, particle size distribution, zeta potential, organic carbon content, cation exchange capacity (CEC) and specific surface area (BET). Deflocculation curves were determined by measuring the viscosity for 50 wt.% clay slips. The results indicate that additive consumption is closely related to CEC and BET, which correspond respectively to the chemical and physical characteristics of the clay mineral's surface. Moreover, viscosity values at the deflocculation point are closely related to BET.

Keywords

clay suspensionsdeflocculationcation exchange capacityspecific surface area
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 3 , June 2013 , pp. 473 - 480
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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