Roller Press Granulator Production Line: An Efficient Choice for NPK Compound Fertilizer Production

In compound fertilizer production, roller press granulator production lines have become the preferred equipment for many companies due to their flexible raw material adaptability and efficient production process. This line can process over 20 types of raw materials, including nitrogen fertilizers (ammonium nitrate, urea, ammonium chloride, calcium nitrate), phosphate fertilizers (ammonium phosphate, calcium phosphate, heavy calcium, phosphate rock), and potash fertilizers (potassium chloride, potassium sulfate). It can also add trace elements such as boron, iron, copper, zinc, and manganese to meet diverse fertilizer formulation needs. The line also has flexible raw material particle size requirements, accepting both 1-4mm granules and fine powders. The preference for powders can also reduce production costs and further improve economic efficiency.

In terms of equipment configuration, the entire production line consists of seven core equipment components that work together to ensure smooth production. The process includes a batching machine for precise batching, a double roller press granulator for core granulation, a crusher for breaking up agglomerated materials, a screening machine for screening and grading particles, a coating machine for optimizing particle appearance and preventing agglomeration, a belt conveyor for material transport, and an automatic packaging machine for automated packaging, forming a complete chain from raw material processing to finished product packaging.

Its production process is clear and efficient, divided into four major links. First, storage and metering are performed. Urea, ammonium phosphate, potassium chloride, and other mixed fertilizer raw materials are transported to a storage silo via bucket elevators and belts to reserve raw materials for subsequent production. Next, extrusion granulation takes place. The mixed raw materials are fed into the gap between two rollers via a vertical screw feeder. During the extrusion process, the pressure on the material gradually increases, reaching a peak when the gap between the two rollers is minimized, then gradually decreases to zero, completing the process. Next, crushing and grading take place. The slabs formed by roller pressing are crushed by a dedicated flat plate crusher. After screening, the fine particles from the lower screen are returned to the mixer for re-extrusion. The larger particles from the upper screen are crushed again and then returned to the screen. The equipment selection in this step significantly impacts the economic efficiency of the entire system. Finally, polishing and coating take place. Irregular particles are rounded off in the drum, and the fine powder produced by polishing is recovered through screening. An anti-caking agent is added during coating, ultimately resulting in a granular compound fertilizer product with a particle size range of 1-4mm.

At present, the motor power of roller press granulator production line covers 1-20t/h and can be flexibly adapted according to the company's production capacity needs. Our company provides reliable and efficient solutions for compound fertilizer production of different scales, driving the industry towards a more efficient and precise direction.