Treating kaolinitic clays
AssigneeImerys Minerals Limited
InventorChristopher Stirling Hogg
Life of this patent
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Abstract
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.
Claims26
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 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.
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 0.5% to 7% by weight, based on the dry weight of the kaolinitic clay, of a monovalent ion exchanged smectite clay;
- and
- (b) subjecting a mass of the clay mixture formed in step (a) having a water content in the range from 20% to 30% by weight water, to mechanical working under conditions such that there is dissipated in the mass of the clay mixture from 20 kJ to 175 kJ of energy per kilogram of clay mixture on a dry weight basis.
Dependencies are inferred from the claim text.