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NPK granular fertilizer production line includes more equipment and processes than powder production line, such as a feeder, granulation equipment, dryer, cooler, screening machine and packaging machine.

The specific steps as follows:

To begin with, the raw materials need to be mixed evenly to facilitate subsequent granulation. After preparing the raw materials, the crushing equipment can crush the NPK raw material into smaller particles. Then you will use a granulator to make the powdery raw materials into granules, and the mixed raw materials are granulated in the granulator. Afterwards, since the water content of the granulated pellets is too high, so there should have drying machine to dry out water moisture to improve the storage stability and ease of use of the fertilizer. The cooler is always an equipment that cooperate with the dryer, and is usually used to cool the fertilizer after drying. Finally, you can package the granulated pellets for sale.

There is an inclined disc inside the disc granulator. The NPK fertilizer granules are made through the rotation of the disc and the humidity of the materials. The disk pelletizer is a common granulator, and it adopts wet granulation method. Through the rotating disk surface, the NPK material powder is pelletized under the action of centrifugal force, friction and gravity under certain humidity conditions. It not only has a simple structure and flexible operation, but also has a high granulation rate of more than 93%. For this reason, it is known as one of the first choices of many NPK compound fertilizer manufacturers because of its high efficiency.