An NPK compound fertilizer production line is a complete automated equipment system that achieves precise proportioning, processing, granulation, and finished product shaping of nitrogen, phosphorus, and potassium raw materials. The entire system is tightly integrated and flows seamlessly, completing the entire process from raw material handling to finished product packaging. It is widely compatible with mainstream production processes such as rotary drum granulation and amino acid granulation. The complete set of equipment is mainly divided into five core systems: raw material batching, granulation and shaping, drying and cooling, screening and dust removal, and finished product packaging. These systems form the core foundation for ensuring the production capacity and quality of compound fertilizer.

The raw material batching system is the first step in the production line. The core equipment includes an automatic batching system, a belt conveyor, and a crusher. The crusher is responsible for breaking down agglomerated and large pieces of raw materials into finer particles, ensuring uniform particle size. The automatic batching system accurately measures nitrogen, phosphorus, potassium, and trace elements according to crop-specific formulas, eliminating proportioning deviations and ensuring that fertilizer nutrients meet standards from the source. The materials are then transported at a uniform speed by the conveyor to the next process.
The granulation and forming system is the core of the production process, with the main equipment being a rotary drum granulator paired with a mixer. The mixer first thoroughly mixes and blends various raw materials, eliminating nutrient stratification. The granulator, through rolling friction and material agglomeration principles, forms uniform granules from powdery raw materials. It can also adjust the granule size according to production needs, ensuring fertilizer formation rate and is a key piece of equipment determining product appearance and fertilizer efficacy.
The drying, cooling, and screening system is responsible for granule shaping and quality improvement, mainly including a dryer, cooler, and vibrating screen. Freshly formed wet granules have high moisture content and a soft texture. They are dehumidified and solidified at high temperature by the rotary drum dryer, and then rapidly cooled by the cooler to prevent granule agglomeration and deterioration. Subsequently, the vibrating screen grades the granules, screening out qualified granules, while powder and large, substandard granules are returned for reprocessing, improving raw material utilization.
The supporting dust removal equipment and automatic packaging equipment are the finishing touches. The dust collector collects dust from the production process, purifying the production environment and meeting environmental protection standards. The fully automatic packaging machine automatically weighs, seals, and stacks qualified finished products, achieving standardized shipment. The entire NPK fertilizer production line is highly automated and interconnected, which can effectively improve production efficiency, stabilize product quality, and meet the needs of large-scale fertilizer production.