NPK blended fertilizer is made by mixing nitrogen (N), phosphorus (P), potassium (K), and other basic fertilizers in specific ratios. The production process requires granulators that handle different raw materials well, offer stable granulation rates, and use less energy.
Types of Fertilizer Granulators and Their Uses
1.Double Roller Press Granulator
Benefits: No binder needed, dry process, saves energy and eco-friendly; hard granules, less dust; works well with moisture-sensitive materials like high-N or high-K.
Best for: Small-to-medium NPK blending fertilizer production lines, especially organic-inorganic compound fertilizers or water-soluble fertilizers.
Benefits: High granulation rate, round granules, good for large-scale continuous runs.
Best for: Large NPK compound fertilizer plants, especially formulas high in phosphorus or needing added trace elements.
Benefits: Simple design, low investment cost, easy to adjust formulas.
Best for: Small-scale NPK blending, best with low-moisture formulas.
Key Factors for Choosing a Granulator:
1.Raw Material Properties: High-nitrogen formulas (like urea) absorb moisture easily – roller extrusion works better. High-phosphorus formulas (like MAP) suit rotary drum granulation.
2.Production Capacity Needs: Small lines can use disc or roller granulators; large continuous production lines should consider rotary drums.
3.Granule Requirements: Need high strength and low dust. Prioritize roller extrusion. Need round granules. Choose rotary drum or disc granulators.
4.Energy Use and Eco-Friendliness: Dry granulation uses less energy than wet methods and produces no wastewater.
In short, choosing the right granulator for NPK blending requires balancing your raw material mix, production scale, granule quality needs, and operating costs.