The fertilizer coating machine is specialized equipment designed to apply a protective coating to the surface of finished granular fertilizers. In organic and compound fertilizer production lines, it is positioned after the screening stage and before packaging. It utilizes a rotating drum to ensure thorough contact between the granules and the coating agent, creating a uniform coating layer on the granule surface. This coating process effectively prevents caking, inhibits moisture absorption, and reduces dust generation, while also enhancing the granules' appearance and marketability. Featuring a simple structure and ease of operation, this equipment plays a vital role in improving fertilizer quality and storage stability.
Working Principle
Finished granular material enters the rotating drum from the feed inlet; as the drum rotates at a constant speed, the material is continuously tumbled and dispersed within. The coating agent is evenly sprayed onto the surface of the tumbling granules via a spray system, or—in the case of powdered agents—metered in using a screw feeder. The granules undergo repeated tumbling and mixing, allowing the coating agent to adhere uniformly and form a protective layer. As the drum rotates, the material moves toward the discharge end while being tumbled; the coated product is then discharged through the outlet and proceeds to the packaging stage.
Equipment Components
Rotating Drum: A welded steel cylinder featuring a smooth interior or simple lifting flights to facilitate granule tumbling and ensure uniform coating.
Spraying System: Liquid coating agent is evenly applied via spray nozzles; a metering pump controls the dosage.
Powder Addition Unit: A screw feeder dispenses powdered coating agent at a controlled rate.
Drive System: A motor drives a pinion gear through a gearbox; the pinion meshes with a large girth gear to rotate the drum.
Support and Thrust Rollers: Support rollers bear the weight of the drum, while thrust rollers prevent axial shifting.
Feed and Discharge Units: Feed and discharge housings are sealed against the drum to minimize dust leakage.
Performance Features
Uniform Coating: Granules tumble thoroughly within the drum, ensuring even distribution and complete coverage of the coating agent.
Effective Anti-Caking: Coated granules feature a smooth surface and excellent flowability, preventing caking during storage.
Ease of Operation: Liquid spray and powder addition rates are adjustable; the system involves few operating parameters and is easy to control.
High Throughput: Drum specifications are designed to match the production line's capacity.
Low Dust Emission: The drum operates in a sealed environment, minimizing the escape of coating agent dust.
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Barrel | Capacity | Power | |||
| Internal Diameter | Length | Inclination | Rotation Speed | |||
| mm | mm | mm |
° |
r/min | t/h | kw |
| BM1200×4000 | 1200 | 4000 | 3 | 14 |
~5 |
5.5 |
| BM1400×4000 | 1400 | 4000 | 3 | 13 |
~7 |
7.5 |
| BM1600×6000 | 1600 | 6000 | 3 | 12 |
~15 |
11 |
| BM1800×8000 | 1800 | 8000 | 3 | 12 |
~30 |
15 |
