table of contents I. Core Structure & Working PrincipleII. Core Advantages & Operational ConsiderationsIII. Primary Application Fields In commercial organic fertilizer production lines and small-to-medium compound fertilizer production lines, converting fine organic compost or nutrient powders into dense, round spherical granules is vital for enhancing product marketability and enabling automated field spreading. A disc granulator […]

In commercial organic fertilizer production lines and small-to-medium compound fertilizer production lines, converting fine organic compost or nutrient powders into dense, round spherical granules is vital for enhancing product marketability and enabling automated field spreading. A disc granulator (also known as a pan granulator or granulating disc) uses an inclined, rotating disc to transform moistened powders into uniform spherical granules through continuous rolling, friction, and liquid-binding forces.

As a dedicated organic fertilizer equipment manufacturer and compound fertilizer equipment manufacturer, Taian Hongxin Environmental Protection Equipment Co., Ltd. supplies complete fertilizer processing machinery—from compost turners and crushers to pan granulators, rotary dryers, and bagging systems—tailored for global fertilizer producers.

I. Core Structure & Working Principle

1. Main Structural Components

• Inclined Granulating Pan: Features an arc-shaped bottom lined with heavy-duty anti-corrosion materials. The disc inclination angle is adjustable between 30° and 55°.

• Liquid Spray Assembly: Uniformly sprays water or liquid binder (such as bentonite or starch binder) to provide surface tension and moisture for particle agglomeration.

• Automatic Scraper: Continuously scrapes off material buildup on the disc bottom and sidewalls, ensuring a smooth, non-stick rolling surface.

• Drive Frame & Adjustment Mechanism: Equipped with an electric motor, heavy-duty gear reducer, and flexible angle adjustment assembly for stable continuous operation.

2. Wet Agglomeration Process

1. Moistening & Nucleation: Composted powder (moisture content around 25%–35%) is continuously fed into the inclined disc while fine water spray dampens the material.

2. Rolling Agglomeration: As the disc rotates, the powder tumbles continuously under centrifugal force, gravity, and friction. Fine particles form tiny seed nuclei, which absorb surrounding powder like a "snowball" effect.

3. Automatic Discharge: When granules reach the target diameter (2–6 mm), their increasing mass overcomes the disc edge barrier, automatically discharging over the rim. Fine unformed powders remain inside for secondary granulating, achieving a balling rate exceeding 90%.

II. Core Advantages & Operational Considerations

Key Advantages:

• High Balling Efficiency (90%): Produces smooth, uniform, spherical granules with excellent commercial appearance.

• Low Initial CapEx & Compact Footprint: Considerably lower equipment and maintenance costs compared to rotary drum granulators; occupies only 3–5 m2 per unit.

• Flexible Parameter Control: Particle size and granule hardness can be quickly adjusted by changing the pan angle, rotational speed, and liquid spray rate.

• Ambient Temperature Processing: Operates without thermal input, preserving heat-sensitive beneficial microorganisms and organic matter in bio-organic fertilizers.

Operational Limitations:

• Sensitivity to Moisture Content: Powders that are too dry fail to agglomerate, while overly wet feeds cause excessive sticky buildup.

• Moderate Capacity Output: Best suited for plants producing 10,000 to 50,000 tons/year. Larger industrial facilities generally favor rotary drum granulators.

III. Primary Application Fields

• Organic & Bio-Organic Fertilizer Plants: Granulation of fermented poultry manure, livestock dung, crop straw, and humic acid blends.

• Compound NPK Fertilizer Lines: Agglomeration of nitrogen, phosphorus, potassium, and micronutrient salt powders.

• Industrial Powder Granulation: Processing animal feed, mineral powders, bentonite, and cat litter pellets.