Organic Fertilizer Disc Granulator Pelletizing Principle
The organic fertilizer disc granualtor relies on the combined effects of mechanical rotation, gravity agglomeration, and atomization to gradually roll, agglomerate, and grow powdery organic fertilizer raw materials within an inclined disc, ultimately forming uniform, round, and high-strength granules. This is the most mature and widely used cold granulation method in disc granulation produciton lines.
During operation, the inclined disc rotates at a stable speed. Under the combined action of centrifugal force, friction, and gravity, the powdery material spirals upwards along the bottom of the disc. Upon reaching a certain height, the material rolls downwards due to its own weight, forming core master granules through continuous tumbling, kneading, and compression. The master granules continuously absorb surrounding powder during the circulating motion, gradually increasing in size, like a snowball rolling downhill, layer by layer, forming a dense, compacted pellet.
During the granulation process, water or binder is evenly sprayed through an atomizing device above the disc. The water acts as a temporary binding medium, making it easier for the powder to adhere to the surface of the master granules, improving the pellet formation rate and granule strength. By adjusting the disc tilt angle, rotation speed, feed rate, and water spray volume, particle size, roundness, and density can be precisely controlled.
As the particles grow, their density and weight increase, causing them to automatically move towards the edge of the disc. Once they reach the set particle size, they overflow from the discharge port, completing the granulation process. The entire process is continuous and stable, resulting in a high pelleting rate, smooth and round particles with moderate strength, facilitating subsequent screening, drying, and packaging.
This principle features a simple structure, intuitive operation, and low failure rate, making it particularly suitable for granulating fermented organic fertilizer, livestock manure, straw powder, sludge, and other raw materials. It is a key piece of equipment for large-scale organic fertilizer production.
