Disc Granulator Manufacturer for NPK & Organic Fertilizer Granulation

Required data includes: raw material data (composition, moisture content, bulk density, temperature), product data (target particle size 1–6 mm, pellet density, crush strength), and process data (construction materials, electrical controls, ambient temperature and humidity). Most data is obtained through material testing. MAXTON provides complete process data collection at the Innovation Center.

A disc granulator is ideal for: wet granulation of fine powders (80% passing 80-mesh), capacity range 0.2–20 t/h, producing 1–6 mm spherical granules with 80–95% balling rate, applications requiring superior sphericity and visual monitoring, frequent formula changes, and organic/inorganic fertilizers. For sealed reaction granulation or capacities above 30 t/h, consider a rotary drum granulator.

Retention time (30 seconds to 20 minutes) directly impacts pellet quality. Longer time means more revolutions, resulting in higher density and crush strength but lower throughput. Shorter time produces loose pellets below 8 N/pellet that are prone to breakage. To increase strength, extend retention time by flattening inclination by 1°–2° or reducing rotation speed.

Pre-dry incoming material to standardize moisture content. Back-mix dry product with fresh feed to dilute variability. Optimize upstream mixing for binder-powder contact. Test moisture, fineness (80% passing 80-mesh) and bulk density per batch. Adjust spray rate and inclination accordingly. Implement batch tracking and statistical process control.

Disc granulation relies on liquid bridges between fine powders for seed nucleation and layering. Too coarse (>20% oversize) results in insufficient binder contact and a 20–25% drop in granulation rate. Too fine (>30% dust) causes over-saturation, paste formation and disc sticking. Optimal particle size ensures stable classifying motion and onion-skin layering.

A complete disc granulation line requires: crushing and mixing equipment (upstream), feed and discharge systems, screening and recycle system for off-spec fines, a downstream rotary dryer (removes 15–30% moisture), a cooling machine, a coating machine, a packaging system, and supporting equipment such as elevators, belt conveyors, pulse dust collectors and spray towers.

PLC automation with MCC and HMI can control: online moisture monitoring, coordinated feed and spray control, start/stop sequencing, and safety interlocks. Operator-dependent monitoring includes spray pattern uniformity, cascading bed trajectory, and pellet sphericity and finish assessment.

A high-quality process design involves: 1) Material testing to validate feasibility and collect design data, 2) Determining optimal parameters (fill %, retention time, moisture, speed, inclination), 3) Scale-up calculation based on pilot data, 4) Custom engineering of disc diameter, edge height, drive power, scraper design, and spray system, 5) Integration with upstream and downstream equipment.

Yes. Wet agglomeration adds liquid binder, leaving granules with 15–30% moisture. A downstream rotary dryer is required to remove moisture while rounding and polishing the granules. The complete line also typically includes cooling, screening and coating stages.

Typical wear parts include: disc lining and surface plates (subject to abrasion from fine powder), scraper blades (require periodic replacement due to wear), spray nozzles (can clog or wear out over time), bearings and seals, and drive belt/torque limiter components. MAXTON uses wear-resistant materials and offers wear part kits for easy maintenance.

A disc granulator typically operates in continuous mode for 24-hour industrial fertilizer production. Continuous operation provides consistent output, automatic classification, and efficient granulation. Batch operation is possible for R&D and pilot-scale material testing at the MAXTON Innovation Center.

Prevent caking by: using self-cleaning scrapers with 2–3 mm clearance, reducing spray volume and increasing recycle rate, adjusting speed (10–30 rpm) and inclination (45°–55°), enhancing cooling of feed material, and applying anti-caking agents if needed. Critical: ensure spray nozzles hit the cascading material bed, not the bare disc surface.

Persistent buildup despite clean scrapers indicates: excessive moisture (>30%), off-spec particle size (too fine or too coarse), inadequate disc inclination causing poor material flow, incorrect spray pattern hitting disc surface instead of material bed, or material temperature issues causing adhesion. Root cause analysis of material properties and process parameters is required.

Disc Granulator: capacity 0.2–20 t/h, superior sphericity due to auto-classification, excellent formulation flexibility with open pan design, moderate dust, lower investment cost. Rotary Drum Granulator: capacity 1–100+ t/h, good sphericity, moderate flexibility with closed system, low dust due to sealed design, higher investment cost. Choose disc for small batches, frequent formula changes and high sphericity. Choose drum for high-capacity single-line production above 30 t/h.

Best maintenance practices: 1) Daily visual inspection of material bed and cascading trajectory, 2) Weekly scraper clearance check and adjustment (2–3 mm), 3) Monthly bearing lubrication and belt tension check, 4) Quarterly spray nozzle inspection and cleaning, 5) Annual wear part replacement (disc lining, scrapers), 6) Keep process logs for trend analysis and predictive maintenance scheduling.