Infrared study of grinding kaolinite with alkali metal chlorides

Shmuel Yariv*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Kaolinite was mechanically ground in the presence of NaCl, KCl, RbCl and CsCl and in their absence, and i.r. spectra were recorded after various periods of grinding. Changes in the intensity and sharpness of the absorption bands were interpreted using accepted assignments. The following effects were observed: 1. (1) Destruction of the kaolinite structure and formation of amorphous material. 2. (2) Solid state diffusion of atoms, particularly protons, leading to the formation of lattice defects. 3. (3) Delamination of the tactoid of kaolinite. 4. (4) Enhanced hydration. The relative weight and significance of these reactions depend on the alkali halide present. Thus, after grinding, different spectra are obtained with different alkali halides. In the presence of CsCl hydrogen bonds were formed between basal hydroxyls and sorbed water molecules.

Original languageEnglish
Pages (from-to)131-138
Number of pages8
JournalPowder Technology
Volume12
Issue number2
DOIs
StatePublished - 1975

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