The selection of a bio-organic fertilizer granulator should focus on three core aspects: preserving active microorganisms, achieving a high granulation rate, and matching the characteristics of the raw materials.  The machine type should also be determined based on production capacity and finished granule requirements. Specific points are as follows:

1. Prioritize Low-Temperature Granulation Machines

Bio-organic fertilizers contain active functional bacteria, so high temperatures that could inactivate them must be avoided.  Prioritize organic fertilizer disk granualtor machine  and flat die pelleting machine (for room-temperature granulation), and avoid high-pressure, high-temperature machines such as double roller press granualtors. If spherical granules are required, a spherical shaping machine can be used in conjunction, with the entire process temperature controlled below 45℃.

2. Match Raw Material Adhesiveness and Particle Size

For high-fiber, low-adhesion raw materials such as straw and sawdust, prioritize ring die extrusion granulators (adjustable pressure, high granulation rate); for high-adhesion raw materials such as composted livestock and poultry manure, disc granulators can be selected (simple operation, low energy consumption); the machine should be equipped with an adjustable crushing and feeding system to accommodate raw material fineness of 40-60 mesh.

3. Consider Production Capacity and Automation Needs

For small-capacity (≤5t/h) production lines, small disc granulators or flat die extrusion granulators can be selected, resulting in lower investment costs; for medium to large capacities (5-20t/h), ring die extrusion granulators with automatic batching systems are preferred to improve production efficiency; large-scale factories can be equipped with post-spraying devices for microbial agents to reduce the loss of microbial agents during the granulation process.

4. Consider Equipment Durability and Maintenance Costs

Core components (such as ring dies and pressure rollers) should be made of wear-resistant alloy steel to extend their service life; prioritize machines with simple structures and easy disassembly and cleaning to reduce future maintenance difficulties; also consider whether the equipment supports variable frequency speed control, which facilitates parameter adjustment based on raw material characteristics.