Granulation is the core process in compound fertilizer production; equipment selection directly determines the granulation rate, product quality, energy consumption, and production efficiency. Mainstream granulation equipment on the market falls into three categories: disc granulators, rotary drum granulators, and double-roller press granulators. Selection requires a comprehensive assessment of production scale, material characteristics, product standards, and production conditions to avoid issues such as wasted capacity or substandard finished products resulting from ill-considered purchases.

Production scale is the primary criterion for selection, as different types of equipment are suited to vastly different production volumes. Disc granulators feature a simple structure and low cost, offering an hourly output of 1–10 tons and a granulation rate exceeding 93%; they produce round, uniform granules and are ideal for small-to-medium-sized lines (under 100,000 tons annually), making them suitable for startups and small-scale operations. Rotary drum granulators excel in capacity, delivering 10–40 tons per hour with stable, continuous operation; they are the mainstream choice for large-scale production bases, capable of meeting high-volume manufacturing demands. Double-roller press granulators offer a moderate hourly output of 5–20 tons, balancing flexibility and stability, and are well-suited for medium-scale, standardized production lines.
Material characteristics determine equipment suitability and are crucial for ensuring smooth production. High-moisture, high-viscosity raw materials are best processed using disc or rotary drum wet granulation equipment, which ensures good granule formation and minimizes clogging. For heat-sensitive or low-moisture powdered raw materials—as well as functional fertilizers that do not require water for granulation—double-roller press granulators are the preferred choice; their dry granulation process eliminates the need for drying, preserves active fertilizer ingredients, and yields granules with high hardness and uniform shapes. If raw materials contain many impurities or involve complex formulations, wear-resistant and clog-resistant rotary drum granulators are recommended to reduce the likelihood of equipment failure.
Product quality and supporting production conditions must also be considered. High-end slow-release fertilizers and those enriched with trace elements require high granule hardness and uniform appearance, making extrusion or advanced wet granulation equipment the most suitable options. Factors such as facility space, energy costs, and environmental regulations must be considered; compact disc granulators are suitable for smaller sites, while large-scale rotary drum equipment is appropriate for larger plants. Furthermore, priority should be given to equipment featuring wear-resistant core components and high levels of automation, complemented by material recirculation systems to maximize raw material utilization. Selecting a manufacturer with comprehensive after-sales support is also crucial to ensuring the long-term, stable operation of the production line.
In summary, selecting compound fertilizer granulation equipment does not require opting for the most high-end models; the key is finding equipment that aligns with specific production needs. Precise selection based on the three dimensions of production capacity, material characteristics, and product standards is essential to achieving high-quality, efficient, and cost-effective large-scale production.