Surface Chemistry and Rheology of Slurries of Kaolinite and Montmorillonite from Different Sources
| Autor: | Pek-Ing Au, Yee-Kwong Leong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | KONA Powder and Particle Journal, Vol 33, Iss 0, Pp 17-32 (2015) |
| Druh dokumentu: | article |
| ISSN: | 0288-4534 2187-5537 |
| DOI: | 10.14356/kona.2016007 |
| Popis: | Zeta potential (ζ)-pH and yield stress (τy)-pH behaviour of a number of kaolinite and montmorillonite slurries, including CMS-sourced materials, were compared. The CMS KGa-2 and Crown kaolin with very similar elemental composition displayed almost identical ζ-pH and τy-pH behaviour. Both displayed a pHζ=0 at 3–4 where the maximum τy was located. This pHζ=0 was higher at higher ionic strength as the pH-dependent charge increased with ionic strength and the permanent structural charge being invariant. The other kaolinite slurries (Reidel and Unimin) with different composition showed different behaviour. The surface chemistry and rheological properties of CMS-sourced SWy-2 (Na-) and STx-1b (Ca-) montmorillonite and bentonite slurries were also compared. They all displayed a negative zeta potential that was insensitive to pH. STx-1b slurries required a much higher solid concentration to form a gel. Maximum τy occurred over a broad range of pH. This pH is ∼5 for SWy-2, 8 for STx-1b, |
| Databáze: | Directory of Open Access Journals |
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