1. Dry powder fertilizer granulator: double roller fertilizer granulator, flat die extrusion granulator. Raw materials mainly refer to products with relatively low moisture content, generally less than 10% moisture (There are also very few materials that can reach 16%, such as some materials with only crystalline water.). Dry granulation usually produces irregular particles (such as granular potassium fertilizer), or its shape is similar to small gravel.
2. Wet method fertilizer granulator: rotary drum granulator, disc granulator, organic fertilizer granulator. The moisture content of raw materials for wet granulation is more than 20%. With the use of different materials and processing requirements, these granulators are constantly improving and have made great progress. Comparing with the commonly used organic fertilizer granulator, its particle size is usually between 1 mm and 6 mm.
Compared with wet granulation, dry granulation has the advantages of lower energy consumption, more environmental protection, no drying, no water and binder, so it does not change the properties of materials. This is also the main advantage of dry granulation which is different from wet granulation. Dry granulation is more suitable for large-scale industrial production.