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Product Description
This industrial-grade rotary dryer is a highly efficient dehydration equipment specifically developed for the bentonite ore drying process, with a processing capacity covering the full range from 5 TPH to 80 TPH. As a clay mineral mainly composed of montmorillonite, bentonite possesses unique physical properties such as strong water absorption, high swelling capacity when wet, high stickiness, and high shrinkage after drying. Conventional drying equipment often suffers from issues like wall-sticking, clumping, clogging, and uneven drying when processing this material.
Our rotary dryer has been comprehensively optimized across multiple dimensions—including structural design, temperature control systems, and anti-sticking mechanisms—to ensure uniform, stable, and highly efficient drying across all capacity ranges. Meanwhile, it maximizes the retention of bentonite's core performance indicators, such as its original swelling capacity, adsorption properties, and colloid value.
The equipment is widely used in mining, bentonite deep processing, cat litter production, foundry binder preparation, drilling mud additive manufacturing, eco-friendly filler production, and various other industrial fields. It is an indispensable, key drying asset in the bentonite industry chain. With over 15 years of experience in manufacturing bentonite drying equipment, we have served clients in more than 30 countries globally. As a direct manufacturer with our own factory (not a trading company), we guarantee transparent pricing and controllable delivery times. We warmly welcome factory visits and inspections.
Functional Principle
The machine utilizes a rotary drum drying principle. During operation, wet bentonite ore is fed from the inlet into an inclined, rotating drum. The drum is equipped with a specialized combination of anti-sticking lifting flights inside. As the drum rotates slowly, the material is continuously lifted and showered by the flights under the combined action of gravity and rotation, coming into full contact with the high-temperature hot air generated by the burner to achieve highly efficient heat exchange. The evaporated moisture is discharged with the exhaust gas, while the dried material is discharged from the outlet.
To protect the material, the interior of the drum is divided into three distinct temperature zones along the path of material travel:
Preheating Zone (50°C–80°C): Gradually raises the material temperature to prevent surface crusting caused by rapid initial drying.
Main Drying Zone (150°C–350°C, adjustable): Achieves highly efficient evaporation of deep-seated moisture.
Cooling Zone (Below 60°C): Lowers the discharge temperature to facilitate subsequent storage and packaging.
This three-zone independent temperature control makes the drying process gentle and manageable, effectively preserving critical bentonite properties like the swelling ratio and Cation Exchange Capacity (CEC).
Exhaust & Energy Efficiency
The exhaust gas passes through a cyclone separator to remove large dust particles, followed by a baghouse dust collector for secondary filtration, controlling the emission concentration below 30 mg/m³. The burner can be configured to use various fuel types based on local energy availability, including coal, natural gas, fuel oil, and biomass pellets. An optional waste heat recovery exchanger can capture heat from the high-temperature exhaust gas to preheat the intake air, boosting the comprehensive thermal efficiency from the traditional 30%–40% up to 55%–65%.
Drive System
The drive system employs a low-speed, high-torque reducer coupled with a Variable Frequency Drive (VFD) motor, offering an adjustable speed range of 2–6 rpm. Low-speed operation ensures that the material tumbles and exchanges heat thoroughly within the drum, while significantly reducing the mechanical crushing rate and dust generation. The VFD control allows real-time speed adjustments based on the feed volume, achieving an optimal balance between capacity and energy consumption.
Core Features
1. Anti-Sticking Internal Design to Solve Wall-Sticking
When moisture content is high (typically 15%–30%), bentonite becomes extremely sticky. Traditional dryer lifters and inner walls easily become coated, causing a sharp drop in heat exchange efficiency. This machine utilizes combination anti-sticking lifting flights lined with wear-resistant ceramic tiles, creating a smooth surface that resists adhesion. Additionally, an automatic self-cleaning chain mechanism is installed inside the drum to continuously scrape material accumulations off the inner wall during rotation, eliminating sticking issues from the root.
2. Multi-Zone Gradient Temperature Control to Protect Core Properties
The three-zone independent temperature control ensures a gentle, highly managed drying process. The preheating zone prevents surface crusting, the main drying zone drives out deep moisture efficiently, and the cooling zone ensures safe discharge temperatures. This entire process maximizes the retention of bentonite's swelling ratio, adsorption properties, and CEC, which is vital for high-value-added products like cat litter and drilling muds.
3. Flexible Fuel Options for Reduced Operational Costs
The heat source system supports coal, natural gas, fuel oil, biomass pellets, and steam, allowing users to select the most cost-effective option based on local energy prices. With the optional waste heat recovery system, comprehensive thermal efficiency jumps to 55%–65%, yielding substantial annual fuel savings and a short investment payback period.
4. Low-Speed, High-Torque Drive for Low Crushing & Low Dust
Equipped with a VFD motor and a hard-tooth surface gear reducer, the drum speed is adjustable between 2–6 rpm. Low-speed operation ensures the material rolls gently for thorough heat exchange while minimizing mechanical degradation and dust generation—making it perfect for premium bentonite deep processing that demands precise particle size control.
5. Low Emissions and Eco-Friendly Compliance
The system comes standard with a cyclone separator plus a baghouse dust collector, keeping emission concentrations ≤ 30 mg/m³. It can be upgraded to a wet scrubber and desulfurization tower combination to meet ultra-low emission standards. Both the inlet and outlet ends feature a dual-sealing structure of graphite packing and labyrinth seals, effectively preventing cold air infiltration and dust leakage.
6. Full-Range Coverage and One-Stop Selection
With capacities ranging from a 5 TPH small-scale machine to an 80 TPH heavy-duty model, our modular design allows flexible capacity matching based on your production needs.
Small models: Ideal for processing plants with a daily output of 50–100 tons.
Medium models: Ideal for enterprises with a daily output of 200–500 tons.
Large models: Tailored for mines and large deep-processing projects exceeding 500 tons per day.
7. Robust, Durable, and Easy to Maintain
The drum shell is constructed from high-strength Q235B carbon steel, and the interior is lined with wear-resistant ceramic or high-chromium cast iron plates to withstand highly abrasive conditions, ensuring a long service life. Common wear parts (lifting flights, seals, chains, etc.) are always kept in stock and can be shipped within 48 hours. The entire machine comes with a 12-month warranty, with 18 months for core components, alongside lifetime remote technical support.
Get a Quote Within 24 HoursPlease share your initial moisture content, target output moisture, daily processing capacity, available fuel types, and site dimensions. We will provide a detailed technical proposal and quotation within 24 hours. Direct factory supply, OEM/ODM customization supported, worldwide shipping available.
8.Technical Specifications
| Product Specs (m) | Capacity (T/H) | Main Motor Power (kW) | Main Motor Model | Main Gearbox Model | Ratio |
| φ1.2×10m | 2.5 | 7.5 | Y160M-R3 | ZL50-16-1 | - |
| φ1.5×12m | 3.3 - 4.9 | 10 | Y160L-6B3 | JZQ500-III-2F | - |
| φ1.5×15m | 4 - 6 | 18.5 | Y200L-6 | JZQ500-III-2F | - |
| φ1.8×12m | 4 - 6 | 11 | Y200L-6 | ZQ50-16II-2 | 16.46 |
| φ2.2×12m | 7 - 12 | 18.5 | Y160L-6 | JZQ650-III | 31.5 |
| φ2.2×14m | 7 - 12 | 18.5 | Y160L-6 | JZQ750-III | 31.5 |
| φ2.2×16m | 12 | 30 | Y225M-6 | JZQ750-III | 31.5 |
| φ2.4×14m | 12 | 30 | Y250M-6 | JZQ750-III | 31.5 |
| φ2.4×18m | 10 - 13 | 37 | Y250M-6 | ZL85-13-1 | 27.16 |
| φ2.4×20m | 10 - 14 | 37 | Y250M-6 | ZL85-13-1 | 27.16 |
| φ3×20m | 25 | 55 | Y250M-4 | ZL100-16-1 | 41.52 |
| φ3×25m | 32 - 36 | 75 | YR280M-4 | ZL100-16-1 | 41.52 |
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