A method of treating a kaolinitic clay, kaolinitic clay and composition for making ceramic article

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 5 kJ of energy per kilogram of clay mixture on a dry weight basis.