Clays are obtained as an auxiliary material from kaolin mining, kaolin washing or the processing of other materials.
Secondarily washed clays and kaolins, as well as concrete clays, clays with lignite additives, brick clays, cypris clays, porous and heat-resistant ceramic kaolinitic clays, rock clays with an increased alkali component content, binding clays and illite-montmorillonitic to montmorillonitic clays currently used as raw materials for the potential production of sorbents are used for further processing.
Another important activity of Sedlecký Kaolin, a.s. is the processing of bentonite and bentonite clays. Bentonite is a soft, fine-grain, inhomogeneous rock that particularly consists of a clay mineral called montmorillonite. Montmorillonite provides the bentonite with its characteristics – great sorption ability, internal swelling capacity when in contact with water, bonding ability and high plasticity. Bentonites are used for many purposes.