NPK compound fertilizer, due to its precise ratio of nitrogen, phosphorus, and potassium nutrients to meet the growth needs of various crops, has become the mainstream choice for modern agricultural fertilization. A 15t/h production line is a medium-to-large-scale configuration, balancing efficiency and stability. Its equipment composition revolves around five core processes: raw material pretreatment, mixing and proportioning, granulation, drying and cooling, and screening and packaging. All equipment operates collaboratively to ensure a stable output of 15 tons of qualified fertilizer per hour.

The raw material pretreatment stage is fundamental to ensuring fertilizer purity. The core equipment includes crushing equipment and raw material silos. Chain crushers or cage crushers are typically used to crush lumpy raw materials such as urea, monoammonium phosphate, and potassium chloride to a uniform fineness, preventing caking from affecting the proportioning accuracy. This crushing efficiency is suitable for a 15t/h production capacity, ensuring a smooth raw material supply. The raw material silos are stored separately for nitrogen, phosphorus, potassium, and auxiliary materials, and equipped with a quantitative feeding device to ensure precise proportioning in subsequent processes.
Mixing and proportioning and granulation are the core links of the production line. The automatic batching system precisely measures and delivers various raw materials to a double axis mixer according to a preset formula, achieving uniform mixing of nitrogen, phosphorus, and potassium. The uniformity of mixing directly determines fertilizer quality. The granulation equipment uses a rotary drum granulator, suitable for a capacity of 15t/h. Through drum rotation and binder spraying, the mixed raw materials are formed into round and uniform granules, achieving a granulation rate of over 90%, meeting the needs of large-scale production.
After granulation, the granules undergo drying and cooling. The core equipment consists of a rotary drum dryer and a rotary drum cooler. The dryer uses a hot air furnace to reduce the moisture content of the wet granules to a acceptable level, preventing clumping during storage. The cooler quickly cools the high-temperature dried granules to room temperature, preventing deformation and deterioration. Both are designed for a capacity of 15t/h, ensuring processing efficiency is synchronized with the granulation process.
Subsequent screening and packaging equipment is responsible for improving the quality and warehousing of the finished product. Drum screeners first separate unqualified particles, returning them to the granulation stage for reprocessing, effectively improving raw material utilization. Qualified particles are then conveyed to a dedicated coating machine, adapted for a 15t/h capacity. Through uniform rotation and a precise spraying system, anti-caking agents and waterproofing agents are evenly coated onto the particle surface, forming a dense protective film. The coated finished particles are then weighed, bagged, and sealed by an automatic packaging machine. Combined with belt conveyors and bucket elevators, this achieves automated conveying and storage of the finished product, minimizing manual intervention and ensuring production efficiency and product consistency.
The entire 15t/h NPK fertilizer production line is tightly integrated, with each piece of equipment precisely matched to capacity requirements. This ensures both the accuracy of fertilizer nutrient ratios and product quality, while also achieving large-scale, automated production, providing hardware support for enterprises to reduce production costs and enhance market competitiveness.