In fertilizer and chemical production, granulation techniques directly impact product quality and efficiency. Dry and wet granulation, as two mainstream methods, have fundamental differences in process flow, equipment needs, and product characteristics.

1.Process Principles  

Dry granulation: Uses mechanical pressure (roller press) to press dry powder directly into shape—no liquid binder added. Typical equipment includes double roller press granulators. 
Wet granulation: Requires adding liquid binders (water or solvents). Powder particles clump together through mixing or tumbling. Common equipment: disc granulators, rotary drum granulators.

2.Material Suitability  

Dry granulation: Best for heat-sensitive materials (avoids decomposition). Handles dry powders with < 8% moisture.  

Wet granulation: Works for non-sticky powders that are hard to press. Handles moist materials with 15–30% moisture.

3.Key Process Flow Differences  

Dry process:  

Raw material prep→Mechanical pressing→Crushing and Screening→Packaging  

Wet process:  

Mixing→Binder addition→Granule forming→Drying→Cooling→Screening→Packaging  

The wet method needs an extra drying step, increasing energy use by ~30%.

4.Cost Comparison  

Dry granulation: Higher upfront cost (20–30% more equipment), lower energy use (no drying), reduced maintenance.  

Wet granulation: More flexible equipment options. Binder cost is extra. Better for small-batch, multi-product production.