In compound fertilizer, organic fertilizer, and NPK fertilizer production lines, the rotary drum granulator is a core piece of equipment. Balancing its production efficiency with pellet quality is crucial.
1.Optimize Raw Material Formula
Moisture Control: Too much moisture causes particles to stick together; too little makes pellet formation difficult. Generally, aim for 25%-35% (adjust based on material).
Fineness Adjustment: Coarse material lowers pellet formation rate; overly fine material increases energy use. An 80-100 mesh range is recommended.
Binder Selection: Add binders like bentonite, humic acid, or liquid binders appropriately to improve pellet strength, but avoid excessive use.
2.Adjust Equipment Parameters
Rotation Speed Optimization: Too high a speed breaks pellets; too low reduces output. Typically, 15-25 rpm works well.
Tilt Angle: This affects material dwell time. An angle of 1°-3° usually balances output with pellet density.
Liquid Spray System: Use atomizing nozzles for even wetting, preventing local over-wetting or dryness, improving uniform pellet formation.
3.Control Drying and Cooling Processes
Drying Temperature: Too high a temperature can cause pellets to crack. Stepwise drying at 80-120°C is suggested to avoid sudden heating.
Cooling Rate: Use the cooler properly for gradual cooling, reducing internal stress and improving hardness.
4.Regular Maintenance and Process Monitoring
Clean Buildup: Regularly remove material caked on the drum’s inner walls to prevent uneven granulation.
Screening Feedback: Use online screening equipment to monitor pellet qualification rate in real-time, allowing dynamic adjustment of process parameters.
The key to balancing the rotary drum granulator’s efficiency and quality lies in raw material pre-treatment, optimizing equipment settings, and coordinating with post-processing. By fine-tuning these scientifically, you can achieve high output while producing strong fertilizer pellets with low dust levels.