An aluminum hydroxide-montmorillonite complex prepared at an OH/A1 ratio of 3.0 (16 meq Al/g clay) and immediately cleaned of any free hydroxy-aluminum behaves like aluminum-chlorite and shows no change after six months ageing. Hydroxy-aluminum completely precipitates within the interlayer space of montmorillonite. Electrophoresis studies show that the hydroxy-aluminum precipitated in montmorillonite is present as uncharged aluminum hydroxide.

X-ray diffraction analysis, thermal (DTA and TGA) studies, infrared absorption analysis, polarographic reduction behaviour, and cation exchange capacity measurements confirm the complete (and stable) transformation of montmorillonite to chlorite structure.

When the hydroxy-aluminum montmorillonite complex is allowed to age in the presence of free aluminum hydroxide (external to the montmorillonite layers), a “seeding” effect takes place and the “fixed” hydroxy-aluminum comes out from the interlayer space.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not have access to this content, please speak to your institutional administrator if you feel you should have access.