Bentonite is an industrial clay composed mainly of smectite-group minerals, especially montmorillonite. Sodium and calcium bentonites do not have identical water uptake, swelling or rheological behaviour.
- Class
- Smectite-rich industrial clay
- Main mineral
- Commonly montmorillonite
- Critical variable
- Exchangeable cation and water response
Why bentonite is not one uniform material
Bentonite is a natural clay feed whose mineralogy, exchangeable cations, carbonates and siliceous impurities vary by deposit. Sodium-dominant material can show stronger swelling in many duties, while calcium bentonite may have different rheology and activation needs.
This is more than a label. End uses can prioritise water uptake, gel formation, binding or adsorption in different ways.
Industrial application logic
- Foundry-sand binder and pelletising
- Drilling fluids and sealing
- Pet litter, absorbent and carrier uses
- Qualified construction and environmental applications
Drying and grinding sensitivity
Moisture is not merely a storage issue for bentonite; it connects to flow, agglomeration, drying load and functional clay structure. Uncontrolled thermal treatment can alter some product properties.
Grinding can open agglomerates and control product distribution. Feed stickiness influences pre-drying and dust-collection design.
Engineering evaluation
- Smectite/mineral content and exchangeable cation
- Natural moisture, swelling and rheology target
- Activation or granular-product requirement
- Target PSD, temperature limit and packing behaviour
