A small-scale NPK fertilizer production line is suitable for enterprises or farmers with relatively low yield requirements. Its equipment configuration emphasizes practicality and economy.

Firstly, there is the raw material processing equipment. A small fertilizer grinder is essential as it can crush block shaped raw materials such as phosphate powder and potassium salt into suitable particle sizes, making it easier to mix evenly in the future. Next is the metering and batching equipment, which uses electronic scales to accurately weigh and mix the main raw materials such as nitrogen, phosphorus, potassium, and additives to ensure accurate nutrient ratios in fertilizers.

The horizontal screw belt mixer is selected as the mixing equipment, which can fully stir and mix various raw materials in a short time, ensuring uniform distribution of fertilizer components. This mixer has a simple structure, easy operation, and is suitable for small-scale production.

The granulation process can choose a disc granulator. By adjusting parameters such as disc speed and material addition amount, it is possible to produce granular fertilizers with relatively uniform size and rounded shape. The granulation process of the disc granulator is relatively mild, has strong adaptability to materials, and has low equipment costs.

The drying equipment adopts a small hot air fertilizer dryer. Using hot air to dry the granulated fertilizer, reducing its moisture content and improving its storage stability. The temperature and wind speed of the dryer can be adjusted to meet the drying needs of different fertilizers.

The cooling equipment follows closely behind, using an air-cooled cooling machine to quickly cool the dried fertilizer and prevent particle deformation or adhesion.

The screening equipment uses a vibrating screen to screen out qualified finished particles, while particles that do not meet the particle size requirements are returned for re granulation.

Finally, there is the packaging equipment, a set of simple automatic quantitative packaging scales that can accurately weigh fertilizers and perform sealed packaging for convenient product storage and sales.

The equipment configuration of the small-scale NPK fertilizer production line aims to meet basic production needs, with low equipment investment, small footprint, and easy operation. It is suitable for producers with limited funds and low production demand, and can produce NPK fertilizer products that meet local market demand.