TREATING KAOLINITIC CLAYS

摘要

A method of treating a kaolinitic clay which is intended for use as an ingredient in a ceramic composition which method comprises the steps of: (a) mixing with the kaolinitic clay from 0.1 % to 15.0 % by weight, based on the dry weight of the kaolinitic clay, of a smectite clay; and (b) subjecting a mass in a moist plastic state of the clay mixture formed in step (a) to mechanical working under conditions such that there is dissipated in the moist plastic mass at least 5kJ of energy per kilogram of clay mixture on a dry weight basis.