The raw materials for producing NPK compound fertilizers mainly revolve around the three major nutrient elements: nitrogen (N), phosphorus (P), and potassium (K).  These are combined with fillers, binders, and other auxiliary materials to suit the granulation and mixing processes of NPK blending machine, ensuring the stable and efficient operation of the NPK blending fertilizer produciotn line.

1. Nitrogen source raw materials

Commonly used materials include urea, ammonium chloride, ammonium sulfate, and ammonium nitrate. These raw materials have a high nitrogen content and good solubility. They can quickly blend with other raw materials in the mixing section of the NPK fertilizer production line. After granulation by the NPK fertilizer equipment, the nitrogen release rate can meet the needs of different crops.

2. Phosphorus source raw materials

These mainly include monoammonium phosphate, diammonium phosphate, superphosphate, and triple superphosphate. Phosphorus source raw materials are mostly in powder or small granular form. They need to be processed through the crushing and screening stages of the NPK fertilizer equipment before entering the mixing system to avoid affecting the granulation quality of the NPK fertilizer production line due to uneven particle size.

3. Potassium source raw materials

These mainly consist of potassium chloride and potassium sulfate. Potassium chloride is cost-effective and suitable for field crops; potassium sulfate is mostly used for chlorine-sensitive crops. Potassium source raw materials have relatively high hardness and need to be pre-processed by a crusher in the NPK fertilizer production line to ensure thorough mixing with nitrogen and phosphorus raw materials and improve the granulation efficiency of the NPK fertilizer equipment.

4. Auxiliary materials

These include fillers (such as bentonite and diatomaceous earth), binders (such as starch and cellulose derivatives), and conditioning agents. These raw materials can optimize the moisture content and binding properties of the materials, solving problems such as caking and insufficient particle strength during the granulation process of the NPK fertilizer equipment, ensuring the continuous and stable operation of the NPK blending fertilizer production line.