Mechanochemical reactions of clay minerals with CsCl

Yariv, S and Lapides, I and Abramova, E (2011) Mechanochemical reactions of clay minerals with CsCl. In: VI International Conference on Mechanochemistry and Mechanical Alloying (INCOME 2008), 1-4 December 2008, NML Jamshedpur, India.

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Abstract

Solid state mechanochemical reactions between clay minerals and CsCl during grinding in non-destructive techniques, investigated in our laboratory, are reviewed. Clays were talc, pyrophyllite, sepiolite, palygorskite and minerals from the serpentine-kaolin and smectite groups. No reaction occurred with serpentines, talc, pyrophyllite and palygorskite. Cation-exchange occurred with montmorillonite and saponite. Kaolin-type minerals were delaminated forming disordered aggregates of TO layers with water, Cs cations and Cl anions. XRD did not show any peak but IR spectra proved the presence of H-bonds between water molecules, and inner-surface oxygens or inner-surface hydroxyls. After water thermal evolution CsCl intercalation complexes with a spacing of 1050 pm were identified. Wet-grinding of sepiolite with CsCl resulted in the disappearance of sepiolite XRD peaks indicating a disintegration of the crystal into micro-crystallites with no order in their packing in the particle. Air-grinding of sepiolite with CsCl almost did not change the X-ray pattern of sepiolite.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/5124
Uncontrolled Keywords:CsCl, Disintegration, Intercalation, Kaolin-type minerals, Sepiolite
Divisions:Metal Extraction and Forming
ID Code:5124
Deposited By:Mr. G Shailendra Kumar
Deposited On:11 May 2012 10:38
Last Modified:11 May 2012 10:38
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