How to Compost Manure

NPK Fertilizer Pellet Manufacturing Process

The manufacturing process for NPK (Nitrogen, Phosphorus, and Potassium) fertilizer pellets involves several key steps. NPK fertilizer pellets are a popular type of fertilizer because they contain the essential nutrients that plants need for healthy growth. Here’s an overview of the typical manufacturing process of NPK fertilizer:

Raw Material Selection:

The primary raw materials for NPK fertilizer production are urea, ammonium nitrate, ammonium sulfate, phosphate rock, and potassium chloride. The specific choice of raw materials depends on the desired NPK formula.

Crushing and Grinding:

The raw materials, especially phosphate rock, need to be crushed and ground into a fine powder to make them suitable for further npk fertilizer processing.


The powdered raw materials are thoroughly mixed to achieve the desired NPK ratio. This is a critical step to make NPK fertilizer with the right balance of nutrients.


Granulation is the process of forming the mixed powders into small, uniformly sized pellets. There are different methods for NPK granule making, including:

  • Dry Granulation: This method involves compacting the mixed powders into pellets without using a liquid binder. It typically requires a specialized granulator.
  • Wet Granulation: In this method, the mixed powders are combined with a liquid binder, often water, to form a paste. The paste is then agitated and granulated into small particles, which are subsequently dried to form solid pellets.

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Compound pellets produced by SX NPK fertilizer production line
Compound pellets produced by SX NPK fertilizer production line


After granulation, the wet pellets are dried to remove excess moisture. This is typically done in a rotary dryer or a fluidized bed dryer.


The dried pellets may undergo screening to separate them into different size fractions, ensuring that the final product meets the desired specifications.


The hot pellets are cooled to ambient temperature to prevent agglomeration and maintain their integrity.

Coating (optional):

Some NPK fertilizers are coated with a protective layer to improve their physical properties, such as dust control and slow-release characteristics.

Quality Control:

The final product is tested for quality and analyzed to ensure it meets the required NPK ratio and other specifications.


The finished NPK fertilizer pellets are packaged in bags or other containers for distribution and sale.

10 t/d NPK fertilizer production line
NPK compound fertilizer plant layout

t’s important to note that the specific manufacturing process can vary depending on the equipment and technology used by the fertilizer manufacturer. Additionally, there are different formulations of NPK fertilizers tailored to meet the needs of various crops and soil conditions, so the exact composition and production methods may differ accordingly. If you need more details about NPK fertilizer making mechanically, you can visit .