Surface Ion-Exchange of Georgia Kaolin and Rheological Properties

刀根, 如人
芝崎, 靖雄
山本, 治

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Publication date

March 1997

DOI

10.2109/jcersj.105.228

Publisher

日本セラミックス協会

ISSN

1882-1022

Citation count (estimate)

Abstract

Effect of surface ion-exchange of Georgia kaolin on the dispersion characteristics and the rheological properties were studied. The ion-exchange was carried out individually with mono-valent cations (Li^+, Na^+, K^+), divalent cations (Mg^<2+> Ca^<2+> Sr^<2+> Ba^<2+> Co^<2+>), and tri-valent cations (Al^<3+> Fe^<3+>), using corresponding chloride solution. The zeta potential increased positively from -30 to + 7 mV by the ion-exchange in the order of mono-<di-<tri-valent cations and simultaneously the viscosity of the slip increased, while the pH decreased from 6.2 to 3.7. Therefore, the zeta potential was considered to be strongly affected by the pH of slurry, but not by absorbed cations on the kaolinite particle. The water film thickness w...