Bentonite is a non-metallic mineral primarily composed of montmorillonite, widely used in drilling muds, foundry binders, iron ore pelletizing, cat litter, geosynthetic clay liners, pet bedding, cosmetics, and detergents. However, raw bentonite ore has a moisture content as high as 20%-35%, with some high-viscosity bentonite reaching 40%-50%. Excess moisture not only increases transportation costs but also significantly affects downstream processing efficiency and product quality.
Drying is a critical step in bentonite processing, directly impacting key indicators such as montmorillonite activity, water absorption capacity, and swelling index. Improper drying temperatures or methods can lead to destruction of the montmorillonite layered structure, reduced activity, and decreased whiteness, severely compromising product value.
Our Bentonite Single-Drum Rotary Dryer is specifically designed for this application. Utilizing rotary drum drying technology combined with a low-temperature, high-air-volume drying process and anti-sticking breaking device, it rapidly reduces bentonite moisture from 20%-50% down to 8%-12%, maximizing preservation of the montmorillonite layered structure, water swelling properties, and cation exchange capacity.
Compared with triple-pass dryers, the single-drum rotary dryer features a simpler structure, lower capital investment, and easier maintenance—making it particularly suitable for large-scale production at bentonite mines and processing plants.
Dried products from the Bentonite Dryer can be widely used in the following applications:
| Application | Product Requirements | Value Proposition |
|---|---|---|
| Drilling Muds | High swelling index, high viscosity | Used in oil, gas, and geological exploration drilling, improving wellbore stability and cuttings suspension |
| Foundry Binders | High wet strength, good thermal stability | Used in foundry sand binding, improving casting surface finish |
| Iron Ore Pelletizing | High binding strength, good compressive strength | Used in iron concentrate pelletizing, improving pellet strength and yield |
| Cat Litter/Pet Bedding | High absorbency, low dust, antimicrobial | Rapid clumping, excellent odor control, maintaining a clean environment |
| Geosynthetic Clay Liners | High swelling capacity, low permeability | Used as impermeable materials in landfills and water conservancy projects |
| Detergents/Cosmetics | High whiteness, uniform particle size | Used as thickeners, suspending agents, and adsorbents |
Core Value After Drying:
Activity Preservation: Montmorillonite activity retention above 90%, swelling index meets specifications
Whiteness Improvement: Low-temperature drying prevents yellowing, enhancing product appearance
Uniform Particle Size: Facilitates subsequent grinding and classification
30%-50% Weight Reduction: Significantly lowers transportation costs
Long-Term Storage: Moisture reduced to 8%-12%, enabling 12-24 months of safe storage
This Bentonite Single-Drum Rotary Dryer utilizes a co-current rotary drying process, specially optimized for the high-moisture, high-viscosity, and temperature-sensitive characteristics of bentonite:
Step 1: Powerful Breaking & Uniform Feeding
Wet bentonite (20%-50% moisture) is fed into the dryer inlet via a belt or screw conveyor. Bentonite has extremely high viscosity when wet and tends to clump, causing blockages. The feed inlet is equipped with a powerful breaking device that forcibly breaks agglomerated wet bentonite into fine particles, preventing feed inlet blockages and laying the foundation for uniform drying.
Step 2: Anti-Sticking Heat Exchange
The broken material enters the rotating cylinder. The cylinder rotates at a set speed, and the interior features a segmented anti-sticking lifting plate system. The specially designed curvature and arrangement of the lifting plates continuously lift, drop, and disperse the material during rotation, forming a uniform "material curtain" that maximizes heat exchange area, while utilizing the material's own gravity and inertia to automatically scrape off adhered wet material from the plate surfaces—effectively preventing wall sticking and ring formation.
A hot air furnace generates 150°C-300°C low-temperature hot air (temperature precisely adjustable based on bentonite thermal sensitivity), which flows co-currently with the material inside the cylinder. The high-air-volume design ensures rapid moisture evaporation while preventing high-temperature damage to the montmorillonite layered structure.
Step 3: Co-Current Drying & Dewatering
Hot air and material flow in the same direction. High-temperature air first contacts the highest-moisture material, rapidly evaporating surface free water. As the material moves toward the discharge end, the air temperature gradually decreases, enabling gentle deep dewatering that removes bound moisture from within the bentonite. The entire process takes approximately 15-30 minutes, reducing moisture from 20%-50% to 8%-12%.
Step 4: Gas-Solid Separation & Exhaust Treatment
The dried bentonite is discharged via a gravity discharger or cyclone separator, proceeding to subsequent grinding, classification, or packaging processes. The dust-laden, humid exhaust gas enters a high-efficiency pulse baghouse filter for purification before being safely discharged. Recovered fine powder can be remixed into the final product, achieving zero loss.
| Model | Cylinder Dia. (m) | Cylinder Length (m) | Capacity (t/h) | Initial Moisture | Final Moisture | Power (kW) |
|---|---|---|---|---|---|---|
| BD-1.2×10 | 1.2 | 10 | 2-5 | 20%-35% | 5%-12% | 22 |
| BD-1.5×12 | 1.5 | 12 | 4-8 | 20%-35% | 5%-12% | 37 |
| BD-1.8×14 | 1.8 | 14 | 6-12 | 20%-35% | 5%-12% | 55 |
| BD-2.0×16 | 2.0 | 16 | 8-16 | 20%-35% | 5%-12% | 75 |
| BD-2.2×18 | 2.2 | 18 | 12-22 | 20%-35% | 5%-12% | 90 |
| BD-2.4×20 | 2.4 | 20 | 16-28 | 20%-35% | 5%-12% | 110 |
| BD-2.6×22 | 2.6 | 22 | 20-35 | 20%-35% | 5%-12% | 132 |
Designed for Bentonite Processing: We deeply understand the characteristics of bentonite—high moisture, high viscosity, and thermal sensitivity. From the breaking device to anti-sticking lifting plates, from low-temperature processes to temperature control strategies, every aspect is optimized for bentonite, ensuring montmorillonite activity remains unaffected after drying.
Improve Product Quality & Value: Low-temperature drying preserves the natural whiteness and montmorillonite activity of bentonite, enabling products to meet the stringent requirements of high-end applications (drilling muds, cat litter, geosynthetic clay liners, etc.), with market value increasing by 30%-50%.
Lower Capital Investment, Shorter Payback Period: The single-drum rotary structure is simple and reliable, reducing equipment investment by 30%-40% compared to triple-pass dryers, with lower maintenance costs—making it the most cost-effective choice for bentonite processing projects.
Reduce Operating & Transportation Costs: Efficient dewatering achieves 30%-50% weight reduction, significantly lowering transportation costs; energy-saving design reduces energy costs; self-cleaning design minimizes downtime for cleaning.
Global Service Network: With over 20 years of experience serving the global non-metallic mineral industry, our products have been exported to over 40 countries and regions including the US, Germany, Japan, Korea, India, Turkey, Brazil, and Mexico. We dispatch engineers for overseas installation and commissioning, providing bilingual technical support.
EPC Turnkey Capability: From material testing, process design, and equipment manufacturing to installation, commissioning, and personnel training—complete turnkey engineering services.
Upgrade your bentonite from "low-value raw ore" to "high-value-added products"! If you are struggling with low drying efficiency, inconsistent quality, or loss of montmorillonite activity, contact us today to get a drying solution tailored to your bentonite.
Get Your Customized Solution:
Request a Quote → Tell us your capacity, material characteristics, heat source availability, and site conditions, and we will respond within 24 hours
Schedule a Technical Discussion → Speak one-on-one with our non-metallic mineral drying engineer
