Principle of Rotary Granulator in Manufacturing Organic Fertilizer and Chemical Fertilizer Pellets

A rotary granulator is a device that forms particles by using a rotating disc or drum to agglomerate materials. Its core principle leverages centrifugal force and friction to gradually cluster and agglomerate materials during rotation, ultimately forming pellets. The specific working process is as follows:

1. Material Pretreatment: Organic fertilizer or chemical fertilizer raw materials are crushed, mixed, and moistened to achieve a suitable state for granulation.
2. Feeding into Granulator: Pretreated materials are conveyed into the rotating disc or drum.
3. Granulation Process:
   • Disc Granulation: Materials on the rotating disc are subjected to centrifugal force and friction, moving upward along the disc edge. During this movement, they continuously aggregate and cluster to form pellets.
   • Drum Granulation: Materials inside the rotating drum collide and compress with each other during rotation, gradually forming pellets.
4. Pellet Formation and Discharge: Formed pellets move toward the center of the disc or drum under centrifugal force and gravity, eventually exiting from the outlet.

Key Technical Points:

• Rotation Speed of Disc/Drum: Affects material trajectory and granulation efficiency.
• Material Moisture and Adhesiveness: Optimal moisture and adhesiveness facilitate pellet formation and stability.
• Angle and Structure of Granulator: Rational design improves granulation efficiency and pellet quality.

Advantages of Rotary Granulator in Manufacturing Organic Fertilizer and Chemical Fertilizer Pellets

1. High Efficiency and Large Production Capacity

• Continuous Production: Enables mass production with high output.
• Rapid Granulation: Materials aggregate quickly during rotation, resulting in high production efficiency.

2. Superior Pellet Quality

• High Sphericity: Produces spherical or near-spherical pellets with smooth surfaces and uniform size.
• High Strength: Pellets undergo repeated compression and collision during rotation, resulting in a dense structure and high strength.
• Good Flowability: Spherical pellets facilitate storage, transportation, and application.

3. Wide Applicability

• Diverse Materials: Processes various organic and chemical fertilizer raw materials (e.g., livestock manure, straw, humic acid, urea, ammonium phosphate).
• Flexible Formulations: Adjustable process parameters to produce pellets meeting diverse needs.

4. Energy Saving and Environmental Friendliness

• Low Energy Consumption: Advanced transmission systems and energy-efficient designs reduce power usage.
• Low Dust Emission: Clean working environment with minimal dust generation.
• Resource Recycling: Converts waste and byproducts into organic fertilizer, promoting circular economy.

5. Simple Operation and Easy Maintenance

• High Automation: Equipped with automated control systems for remote monitoring and operation.
• Simple Structure: Easy maintenance and low operating costs.

6. High Yield Rate

• High Granulation Rate: Over 90% granulation efficiency minimizes material waste.
• Adjustable Particle Size: Pellet size can be controlled by adjusting rotation speed, angle, and material moisture.

Application Examples

• Organic Fertilizer Production: Converts livestock manure, straw, and other organic waste into spherical organic fertilizer pellets for soil improvement and crop yield enhancement.
• Chemical Fertilizer Production: Combines urea, ammonium phosphate, and binders to produce spherical chemical fertilizer pellets, improving fertilizer utilization and application efficiency.

Summary

Rotary granulators utilize rotating discs or drums to form pellets through centrifugal force and friction. They offer high efficiency, superior pellet quality, wide applicability, energy saving, simple operation, and high yield rates, making them widely used in organic fertilizer and chemical fertilizer production.