The rotary drum granulator is a key piece of equipment in modern organic fertilizer production lines. It's specifically designed to turn powdered organic raw materials (like livestock manure, straw, and humic acid) into uniform granules. Its high efficiency and low operating costs make it the top choice for large-scale organic fertilizer production.

Working Principle

1.Mixing and Moistening

Pre-treated organic materials enter the rotating drum through the feed inlet. Here, they are thoroughly mixed with a binder (like water or microbial solution) sprayed by the system, forming a moist material base.

2.Rolling and Granulation

Driven by a motor, the drum rotates at a tilt angle of 15-30° (typically at 20-40 r/min). Centrifugal force makes the material tumble and collide. Fine powder gradually clumps into small particles, which then grow larger through a "snowball effect".

3.Polishing and Drying

In the rear section of the drum, the particles are smoothed and rounded. After being discharged, they can be further dried using a connected dryer to form hard, finished granules that resist crumbling (adjustable size: 2-8mm).

Key Operating Points

1.Raw Material Pre-treatment

Moisture Control: Powder moisture content needs adjusting to 30%-40%. Too high causes clumping; too low reduces granulation success.

Fiber Handling: Long-fiber materials must be pre-crushed to ≤5mm to avoid tangling in the equipment.

2.Optimizing Running Parameters

Speed Adjustment: Adjust the rotation speed based on the required granule size – larger particles need lower speeds.

Tilt Angle Setting: The standard angle is 25°. This can be fine-tuned via bracket bolts to change how long the material stays inside (residence time).

The rotary drum granulator achieves standardized organic fertilizer production through physical granulation. Combined with proper operation, it significantly improves the fertilizer's commercial appeal and added value.