Rotary Drum Granulator
We offer advanced Rotary Drum Granulators designed to transform powdered materials into high-quality, uniform granules for fertilizer production. With a granulation rate of up to 70%, these machines are ideal for large-scale manufacturing of both organic and compound fertilizers. Engineered for efficiency, durability, and versatility, our Rotary Drum Granulators ensure consistent output, supporting sustainable agriculture and boosting crop yields worldwide.
Rotary Drum Granulator Definition
A rotary drum granulator is a type of granulation equipment that transforms powdered materials into uniform, rounded granules through a rotating drum process. It serves as key equipment in compound fertilizer production, capable of processing both organic and inorganic materials into spherical pellets.
Rotary Drum Granulator Specifications
| Model | Body Power（kw） | Spindle Power（kw） | Capacity（t/h） | Inatalled Size（mm） |
| TDZJZ-1060 | Y132M-4-7.5 | Y180M-4-18.5 | 3-5 | 7250*1250*1670 |
| TDZJZ-1660 | Y132M-4-11 | Y180M-4-22 | 5-8 | 7600*1800*2300 |
Working Principle of Rotary Drum Granulator
The rotary drum granulator operates on the principle of wet granulation (also known as agitation agglomeration, balling, or pelletizing), where materials are tumbled in the presence of liquid binders to form uniform granules. This aligns with your interest in understanding how industrial equipment functions.
Mechanical Operation
Drive System
The granulator’s operation begins with the main motor driving a belt and pulley system, which transmits power through a speed reducer to the drive shaft. The open gear installed on the drive shaft engages with a large gear ring fixed on the cylinder body, causing the entire drum to rotate. This rotating motion is fundamental to the granulation process.
Cylinder Rotation
The cylinder rotates at specific speeds (typically 9.5-17.5 r/min depending on size) at a slight angle of 2-5° to facilitate material flow from inlet to outlet. This inclination ensures continuous material movement through the drum while maintaining proper residence time for granule formation.
Granulation Process
Material Entry and Conditioning
Raw materials enter the cylinder through the feeding end, where the feeding system ensures even and continuous material flow. Inside the cylinder, water, steam, or chemical solutions (such as ammonia gas, phosphoric acid, or nitrogen solutions) are sprayed onto the materials through nozzles to achieve optimal moisture content and promote chemical reactions.
Particle Formation Mechanism
As the cylinder rotates, several forces work together to form granules:
Tumbling Action: Materials continuously tumble and roll within the rotating drum
Centrifugal Force: The rotation creates centrifugal forces that help compress particles together
Coalescence: Fine particles collect together and pick up additional fines and binder layers as they tumble, gradually building up into larger, denser particles
Extrusion Pressure: The rolling motion generates pressure between particles at certain humidity and temperature conditions, helping form cohesive granules
Granule Growth and Shaping
The special liner structure inside the cylinder (rubber or acid-resistant stainless steel) helps materials automatically remove irregularities and achieve uniform spherical shapes during rotation. Particles continue to grow as they pick up additional material layers through the coalescence phenomenon, eventually reaching the desired size of 3-6mm.
Discharge and Quality Control
Finished granules are discharged through the outlet, with the slight drum inclination facilitating this movement. A screening device at the discharge point returns undersized or oversized granules back to the cylinder for re-granulation, ensuring uniform product quality.
This continuous process allows for mass production with granulation rates exceeding 70%, making it highly efficient for large-scale fertilizer manufacturing.
Rotary Drum Granulator Price
The cost of our Rotary Drum Granulators varies based on capacity and customization:
| Capacity (t/h) | Cost Range | Example Costs |
|---|---|---|
| 1-3 | $50,000-$80,000 | $50,000 for a 1 t/h model |
| 3-5 | $80,000-$100,000 | $90,000 for a 3 t/h model |
| 5-8 | $100,000-$120,000 | $110,000 for a 5 t/h model |
| 8-15 | $120,000-$150,000 | $130,000 for a 10 t/h model |
| 15-30 | $150,000-$200,000 | $180,000 for a 15 t/h model |
Benefits of Rotary Drum Granulator
Improved Product Quality
Uniform granules ensure consistent nutrient delivery.
Increased Efficiency
Fast granulation process (5-8 minutes) boosts productivity.
Environmental Sustainability
Recycles waste, reducing landfill use and pollution.
Cost Savings
Energy-efficient design and high granulation rate reduce costs.
Market Competitiveness
Meets global demand for high-quality fertilizers.
Applications of Rotary Drum Granulator
Organic Fertilizer Production
Processes manure, agricultural waste, and byproducts into granules.
Compound Fertilizer Production
Blends NPK, DAP, MAP, and other compounds for balanced nutrition.
Mineral Fertilizer Production
Granulates limestone, gypsum, and biochar for soil amendment.
Sustainable Agriculture
Recycles waste into eco-friendly fertilizers.
Landscaping and Gardening
Produces fertilizers for turf and home gardens.
Why Choose Us as Rotary Drum Granulator Supplier?
Decades of Experience
Over 42 years in the fertilizer industry, establishing us as a trusted partner worldwide.
Global Expertise
Proven track record with installations in numerous countries, delivering high-quality equipment and exceptional service.
Innovation
Continuous investment in R&D to provide cutting-edge fertilizer production technology.
Dedicated Support
Comprehensive support from pre-sale consultations to on-site installation and ongoing maintenance.
Get Started Today
Ready to enhance your fertilizer production with our advanced Rotary Drum Granulator? Contact us today to discuss your custom solution and take the first step toward efficient, sustainable, and profitable fertilizer manufacturing.