5-20 T/H Rotary Drum NPK Fertilizer Processing Plant Line

For industrial-scale compound fertilizer manufacturers, producing hard, smooth, and perfectly spherical NPK granules at high throughput requires a robust wet granulation process. The 5-20 T/H Rotary Drum NPK Fertilizer Processing Plant Line is a heavy-duty turnkey engineering solution designed specifically for large-capacity fertilizer production using nitrogen, phosphorus, and potassium salts (such as urea, ammonium nitrate, DAP, MAP, and potassium chloride).

Utilizing steam-assisted or water-injected wet agglomeration inside a continuous inclined rotary drum, fine raw powders tumble, bind, and build up into dense, round granules under surface tension and mechanical rolling forces. This wet granulation method achieves high liquid-to-solid binding efficiency, yielding exceptionally high particle strength and excellent water solubility. The complete integrated plant features automated raw material batching, continuous drum agglomeration, high-efficiency rotary drying and cooling, multi-deck vibration screening, anti-caking oil coating, and automated quantitative packaging. As a dedicated factory supplier, Gofine Machine builds each rotary drum line with thick-walled corrosion-resistant stainless or rubber liners and heavy-duty cast steel driving gears, guaranteeing continuous 24/7 industrial performance and high granulating rates exceeding 90%.

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.