Construction bentonites are produced using a special variety of calcium bentonite with a high content of montmorillonite, with the sodium ion activated. This ensures excellent rheological and expansion properties of this bentonite – it increases its volume 5 to 20 times under the influence of water. Thanks to this property it is widely used for construction materials, mainly in sealing applications.
Construction bentonites are also used for the production of:
Drilling bentonites are produced using a special variety of modified bentonite. Such a formula facilitates the preparation of a suspension which has proper rheological parameters, as specified by the American Petroleum Institute. A bentonite fluid has good lubricating properties and a very high capacity for transporting excavated material irrespective of the local geological conditions.
A drilling fluid is an essential element of drilling work. If badly selected, it can cause many complications during drilling and increased costs as a result.
The functions of a drilling fluid:
Casting bentonites are used in the production of synthetic moulding sands for green-sand moulds. Casting bentonites ensure the high quality of the produced moulding sand. The essential advantages of using moulding sands with bentonite is the facility to cast in green sands without prior drying, and reusability of the sands.
Bentonite is a material consisting mainly of smectite minerals, typically montmorillonites, which possess special swelling and water absorption properties. As an ingredient in binding agents, it provides proper parameters for moulding sands and guarantees very good castings. It is characterised by good strength and high resistance to the temperature of molten metal.
Bentonites for agriculture
Bentonites for agriculture are inactivated pure calcium bentonites, characterized by high montmorillonite content, low heavy metal content, and high water absorption, and sorption.