Bentonite drying has one rule that sets it apart from other clays: the swelling capacity customers pay for is easily destroyed by overheating. Mined and activated bentonite is dried to a moisture window rather than bone-dry, so drilling mud, foundry binder and cat litter grades keep their gel strength and water absorption.
To dry bentonite, GEM recommends the Rotary Dryer. Typical moisture is 25–35% in the feed and 8–12% after drying. Rotary Louvre Dryer and Flash Dryer are used when the feed or site calls for it. Every project starts with a pilot trial on your own sample.
A co-current rotary dryer meets hot gas with the wettest feed, so evaporation keeps the clay cool while it dries to a set moisture. A louvre dryer gives gentler contact for granular litter grades; a flash dryer suits fine, pre-ground bentonite.
| Typical feed moisture | 25–35% |
| Typical target moisture | 8–12% |
| Recommended dryer | Rotary Dryer |
| Alternatives | Rotary Louvre Dryer, Flash Dryer |
| Application area | Minerals, Ores & Ceramics |
| Industries | Minerals, Mining & Ceramics |
Holding moisture in the 8–12% band protects the swelling and binding properties buyers test for, and avoids paying for fuel to over-dry. Dried bentonite also grinds and screens efficiently, opening higher-value packaged grades.
Plants searching for a bentonite dryer or comparing a bentonite drying plant usually need three answers: which dryer fits, what it costs to run, and how fast it pays back. For Bentonite, we start from your throughput, current moisture (typically 25–35%) and the target (8–12%), trial a sample on the Rotary Dryer, and return a sized recommendation with a budget quotation for your minerals operation.
We trial your material in our pilot facility before any equipment decision, then size the dryer from real data.
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