Step 1: The semi-wet material crusher determines the "fineness foundation." Fermented organic materials typically have a moisture content of 30%–50% and are highly viscous and fibrous. If the crushing fineness is insufficient, coarse particles entering the granulator cannot be fully encapsulated by the binder, resulting in rough surfaces and internal "sandwich" defects. The semi-wet material crusher employs a dual-stage rotor structure to break down high-moisture materials to a fineness exceeding 60 mesh; its screenless bottom design prevents clogging caused by sticky, wet material. Finely ground powder offers a larger specific surface area, ensuring strong adhesion during pelletization and naturally resulting in higher granule strength.

Step 2: The new-type organic fertilizer granulator determines the "forming method." This granulator utilizes the principle of wet agglomeration: high-speed rotating mixing teeth first break up and blend the materials, which then adhere layer-by-layer into spheres using their own moisture content. Compared to older equipment, this "new-type" model features two key advancements: process integration (combining mixing and granulation into a single main unit) and precise control (regulating rotation and feed speeds to control the rate of granule growth). It achieves a pelletization rate of over 90% and produces granules with a uniform internal structure, laying the groundwork for subsequent shaping.

Step 3: The organic fertilizer spheronizer determines the "upper limit of appearance." Granules exiting the granulator often have burrs, sharp edges, or slightly flattened shapes. The spheronizer uses rotational friction and centrifugal force to shape these semi-finished granules. As the granules rub and roll against each other within the spheronizing disc, sharp edges are smoothed away and surfaces become polished; sphericity improves by 30%–50%, and compressive strength increases concurrently. Spheronized granules perform more reliably during packaging, transport, and mechanical sowing, and command a higher market price.

Step 4: The fertilizer coating machine determines "functional added value." The coating machine evenly sprays a coating agent onto the granule surface, creating a hydrophobic film. This film enhances visual luster while providing a controlled-release function—regulating the nutrient release rate and minimizing losses due to leaching. The coating agent dosage is typically kept between 0.5% and 2%; uniform application is critical, as excessive thickness in certain areas hinders release, while insufficient thickness fails to achieve the desired controlled-release effect.

Step 5: The BB fertilizer production line determines "blending uniformity." For blended fertilizers, the product's visual appeal depends not only on the individual granules but also on the uniformity of the mixture. The BB fertilizer mixer utilizes a twin-shaft paddle design, completing the mixing process in 2 to 5 minutes with a coefficient of variation (CV) for uniformity of ≤5% and a granule breakage rate controlled below 0.5%. The core of the BB fertilizer mixing process is "shape-preserving mixing"—achieving a uniform blend without damaging the original form of the granules. Excessive mixing time or rotation speed accelerates granule pulverization, causing fine powder to settle at the bottom after packaging and resulting in uneven nutrient distribution.