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The Dispersive Effect of Sodium Hexametaphosphate on Kaolinite in Saline Water

Published online by Cambridge University Press:  01 January 2024

Mark Ma
Mark Ma*
Affiliation:
CSIRO Process Science and Engineering, Box 312, 3168, Clayton, Victoria, Australia
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Freshwater has become increasingly scarce in many countries. To reduce the consumption of freshwater, the use of saline water resources in industry could provide an opportunity to meet the challenge of water-supply sustainability. However, the presence of electrolytes in saline water causes the coagulation of kaolinite, the colloid stability of which plays a key role in the processing of a number of minerals. Therefore, the dispersion of kaolinite in saline water was studied here. Electrophoretic mobility and colloid stability studies were conducted on a sodium hexametaphosphate-kaolinite system in the presence of NaCl, KCl, CaCl2, and MgCl2, the major electrolytes in saline water resources. The effect of each electrolyte on kaolinite dispersion was studied. Based on the studies of individual electrolytes, a method was developed to disperse kaolinite in 1:1 diluted synthetic seawater with distilled water, which may potentially reduce the consumption of freshwater by 50% when applied in industry.

Keywords

KaoliniteSodium HexametaphosphateDispersionCoagulationSeawater
Type
Article
Information
Clays and Clay Minerals , Volume 60 , Issue 4 , August 2012 , pp. 405 - 410
Copyright
Copyright © Clay Minerals Society 2012

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