Abstract
Aqueous suspensions of
kaolinite from Mt. Egerton, Victoria, have been
leached at pH 2.25 and 6.0. More ions, in particular aluminium, than predicted
from the published cation-exchange capacity have been detected in the leachate. An activation energy of 5 kcal/mole has been
calculated for this process of surface leaching. Using a supporting electrolyte
of, for example, 10-4M KCl, the electrophoretic mobility of leached
and raw clay has been examined as a function of pH, and differences in mobility
have been correlated with aluminium removal from the clay surface.
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30 articles.
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