Automatic NPK Fertilizer Drum Granulator Line for Fertilizer

In large-scale commercial compound fertilizer manufacturing, achieving high granule roundness, superior particle strength, and high hourly output requires an automated, continuous wet granulation process. The Automatic NPK Fertilizer Drum Granulator Line is an advanced engineering solution designed specifically to transform multi-nutrient nitrogen, phosphorus, and potassium (NPK) raw powders—such as urea, ammonium sulfate, DAP, MAP, and potassium chloride—into uniform, dense, spherical fertilizer granules.

Utilizing steam-assisted or liquid-injection wet agglomeration inside an inclined, continuous rotary drum, fine powders tumble over each other and bind into smooth round granules through surface tension and mechanical rolling forces. The entire production line is fully automated via a central PLC control system, linking precise raw material batching, continuous drum agglomeration, industrial drying and cooling, particle size screening, anti-caking coating, and automated bag packaging. As a dedicated factory supplier, Gofine Machine builds this drum granulator line with heavy-duty cast steel driving gears, thick corrosion-resistant steel hulls, and anti-stick rubber or stainless steel inner liners, ensuring high granulating efficiency (>90%) and reliable continuous operation.

To ensure operational stability and long-term reliability, the Gofine rotary drum granulator incorporates several precision-engineered features:

• Corrosion-Resistant Interior: The internal drum is lined with specialized UHMW-PE (Ultra-High Molecular Weight Polyethylene) or acid-resistant stainless steel plates. This minimizes material sticking and protects the shell from the corrosive nature of ammoniated compounds.
• Enhanced Granulation Rate: Through the optimization of drum inclination (typically 2.0% to 5.0%) and rotational speed, the system achieves a granulation rate exceeding 90%, with fewer fines requiring recycling.
• Steam Injection Technology: Integrated steam piping allows for the adjustment of material temperature and moisture levels, ensuring optimal plasticity for granule formation without relying on excessive liquid binders.
• Heavy-Duty Transmission: Featuring a large cast steel gear and a high-performance motor-reducer assembly, the unit maintains stable torque even under full-load conditions (capacities ranging from 1 t/h to 20 t/h).

This granulation system is highly versatile and suitable for:

• High-Concentration Compound Fertilizer: Producing formulas like 15-15-15 or 20-20-10.
• Ammoniation Granulation Processes: Integrating liquid ammonia, phosphoric acid, or sulfuric acid.
• Organic-Inorganic Mixtures: Processing bio-organic materials that require a specific moisture-heat balance for pelletizing.

The production sequence in the drum is a coordinated mechanical and chemical process:

• Material Feeding: Base powders (such as Urea, MAP, or Potassium Chloride) are fed into the rotating drum at a constant rate.
• Ammonia/Steam Injection: Under the rolling bed of material, gaseous ammonia steam are injected. The resulting chemical heat and moisture soften the particles.
• Rolling & Agglomeration: As the drum rotates, the softened materials collide and adhere to each other, forming spherical "seeds" that grow into full-sized granules through centrifugal force.
• Discharge: The finished granules exit the drum and are conveyed to drying and cooling units to finalize their structural hardness.

As a specialized manufacturer, we focus on equipment longevity and process efficiency. Our designs prioritize minimized maintenance intervals and stable operational performance. We provide comprehensive layout designs and technical support to ensure the equipment integrates seamlessly into your existing production plant.