Disc granulation is one of the most widely used traditional processes in NPK compound fertilizer production. Due to its simple structure and strong adaptability, it is commonly adopted by small and medium-sized fertilizer production lines. This process relies on the rotation of a disc to drive the material to tumble and agglomerate into balls, completing the granulation of powder materials. It is compatible with most inorganic nitrogen, phosphorus, and potassium raw materials and occupies an important position in the agricultural input production field. However, it also has certain limitations.

The core advantages of disc granulation technology are very prominent. First, the equipment structure is simple, the investment cost is low, the entire production line occupies a small area, and operation and maintenance are convenient. It does not require complex supporting equipment, greatly reducing the barriers to entry for small and medium-sized fertilizer enterprises. Second, the granulation effect is good; the granules are round and full, with uniform appearance, moderate hardness, and are less prone to deformed granules, resulting in excellent fertilizer appearance quality. At the same time, the process has extremely strong adaptability, allowing for flexible adjustment of the formula to accommodate various NPK ratios and trace element additions. It can quickly adapt to the production needs of special fertilizers for different crops and soils, demonstrating outstanding flexible production capabilities. Furthermore, the process is simple to operate, easy to start and stop, has a low failure rate, requires minimal daily maintenance, and offers high production stability.
However, this process also has significant drawbacks. First, capacity is limited. Compared to drum granulation and extrusion granulation, disc granulation has a lower single-machine capacity, making it difficult to meet the demands of large-scale, high-volume industrial production. Second, production is highly dependent on manual operation. Pelletizing is significantly affected by manual control, material moisture content, and binder ratio. Deviations in manual control can easily lead to fluctuations in pelletizing rate and insufficient stability in product nutrient uniformity. Third, material adaptability is limited. Raw materials that are too fine, too wet, or have poor viscosity are difficult to pelletize, easily resulting in powder residue, material waste, and a slight increase in production dust.
Overall, the NPK disc granulation process is cost-effective, flexible, and practical, suitable for small to medium batch production of multi-formula fertilizers, but not for large-scale standardized mass production. Enterprises can optimize the process by combining it with refined batching and dust removal equipment based on their own production scale to compensate for its shortcomings and improve finished product quality and production efficiency.