Sodium bentonite expands when wet, absorbing as much as several times its dry mass in water. Because of its excellent colloidal properties, it is often used in drilling mud for oil and gas wells and boreholes for geotechnical and environmental investigations. The property of swelling also makes sodium bentonite useful as a sealant, since it provides a self-sealing, low permeability barrier. It is used to line the base of landfills, for example. Various surface modifications to sodium bentonite improve some rheological or sealing performance in geoenvironmental applications, for example, the addition of polymers.
Animal Feed Uses
Bentonite is a clay product that improves pellet quality, prevents caking and improves flowability in livestockfeeds. It also can improve feed efficiency, rate of gain, milk production, wool growth and egg production. Sodium bentonite is believed to function by absorbing ammonia and toxins while reducing the rate of feed passage through an animal’s digestive system.