In the field of granulating powdery materials, the disc granulator (also known as a pan granulator) is a widely used piece of granulation equipment. It agglomerates powdery materials into spherical granules by utilizing an inclined, rotating disc and the combined effects of centrifugal force, gravity, and friction. It is employed across a variety of sectors, including fertilizer production, chemical raw material processing, and the preparation of pellets in the metallurgical and mining industries.

 

Working Principle of the Disc Granulator

The core mechanism of the disc granulator is straightforward. Powdered material is fed into the inclined granulating disc from the top; under the centrifugal force generated by the disc's rotation, the material is propelled toward the disc wall while simultaneously being acted upon by gravity and friction. Inside the disc, the material continuously rolls and tumbles along a parabolic trajectory. During this process, water or a binding agent is evenly sprayed onto the material, causing the powder to gradually agglomerate and compact until spherical granules are formed.

As the granules roll, they grow in size; once they reach the desired diameter, they automatically spill over the edge of the disc, completing the granulation process. The entire operation achieves a dynamic balance of the material and ensures efficient granulation.

Advantages of Using a Disc Granulator in Fertilizer Production

Pan granulators offer significant value in fertilizer production:

Enhanced Product Quality: The resulting granular fertilizer features a stable structure; the granules are resistant to breakage and caking, making storage, transport, and bagging convenient. Their round, uniform shape enhances market competitiveness.

Suitable for Small and Medium-Sized Plants: The equipment requires a low initial investment, making it ideal for startups and small-to-medium-sized processing facilities with limited capital. It can be operated by a single person, significantly reducing labor costs.

Simplified Production Process: Powdered materials can be fed directly into the machine for granulation, eliminating the need for complex pre-treatment steps.

Continuous Production: The equipment integrates seamlessly with the entire production line—including batching, mixing, drying, screening, and packaging—enabling continuous, automated operations.

Environmentally Friendly: Minimal binder is required, aligning with green fertilizer production standards.

Application Areas of the Disc Granulator

The disc granulator offers exceptional adaptability to a wide range of raw materials:

Fertilizer industry: Granulation of organic fertilizers, compound fertilizers, bio-fertilizers, blended fertilizers, etc.

Chemical industry: Granulation of chemical raw materials.

Metallurgy and mining: Iron ore pelletizing, coal dust pelletizing, etc.

Construction materials and cement: Pelletizing of cement raw meal.

Pharmaceuticals and food: Granulation of pharmaceutical powders and food ingredients.

It is particularly worth noting that the disc granulator delivers outstanding results when processing lightweight, fine-powdered materials; the finer the constituent particles of the material, the higher the sphericity and the better the quality of the resulting pellets.

Key Performance Features of the Disc Granulator

High granulation rate. Featuring a granulating disc with an integrated arc design, the granulation rate exceeds 93%. The disc is typically equipped with three discharge outlets to facilitate intermittent production operations.

Stable and reliable operation. Designed with a thickened and weighted base, some models can operate stably without the need for anchor bolts. The main gear undergoes high-frequency quenching, effectively doubling its service life.

Flexible and controllable operation. Parameters such as the disc inclination angle, rotation speed, and liquid spray volume can be precisely adjusted based on material characteristics and product requirements, allowing for a wide range of granule size control.

Broad application range. Suitable for producing organic, compound, and blended fertilizers, as well as for granulating powdery materials in industries such as chemicals, animal feed, pharmaceuticals, metallurgy, and construction materials.

What are the key maintenance points for the disc granulator?

Regularly check the tension of the drive belts and adjust or replace them promptly.

Monitor the wear of the disc lining; repair any damage to the anti-corrosion fiberglass layer immediately.

Ensure the scraper mechanism functions correctly to prevent material from sticking to the disc and impairing granulation performance.

Regularly check the lubrication of the main gear; while high-frequency quenching extends service life, proper maintenance remains essential.

Promptly clear out residual material from the disc after shutdown to prevent caking.

Why choose Huaqiang Heavy Industry as your specialist manufacturer of disc granulators?

Zhengzhou Huaqiang Heavy Industry is a direct manufacturer specializing in the R&D and production of complete equipment sets for organic and compound fertilizers. With over two decades of technical expertise in the field, the company operates its own manufacturing workshops, a CAD design center, and a dedicated R&D team; it handles the entire production chain for its disc granulators in-house, eliminating intermediary markups.

The company has successfully implemented over 1,000 fertilizer production line projects-both domestically and internationally-and serves more than 2,000 clients worldwide. Its equipment is exported in volume to Australia, Southeast Asia, Africa, and beyond. With the capability to plan and deliver complete organic and compound fertilizer production lines ranging from 10,000 to 500,000 tons in capacity, Huaqiang Heavy Industry stands as a mature and reliable provider of complete equipment solutions in the industry.