Rotary Drum Granulator

Application footprint and audience distribution

The demand for rotary drum granulators spans multiple industries:

Compound fertilizer manufacturers: Producing high, medium, and low concentration compound fertilizers and blended fertilizers using nitrogen, phosphorus, and potassium base fertilizers. This is the primary customer group for rotary drum granulators.

Organic fertilizer manufacturers: Producing commercial organic fertilizers and bio-organic fertilizers using livestock manure, straw, sludge, and other organic waste.

Chemical companies: Granulating powdered chemical products such as laundry detergent and catalysts.

Metallurgical and building materials companies: Pelletizing mineral powders, slag, etc.

Solid waste treatment and environmental protection projects: Resource utilization of urban sludge, kitchen waste, and other waste.

Large-scale agricultural production bases: Building their own organic fertilizer production lines to achieve crop-livestock recycling.

Material range and capacity overview

The rotary drum granulator has a wide range of raw material adaptability. Organic materials include: well-rotted livestock and poultry manure (chicken, pig, cow, sheep manure), straw waste, edible mushroom residue, distiller's grains, medicinal residue, humic acid, and municipal sludge. Inorganic materials include: urea, ammonium chloride, ammonium sulfate, ammonium bicarbonate, superphosphate, superphosphate, monoammonium phosphate, diammonium phosphate, calcium magnesium phosphate, and potassium chloride. Industrial materials include: slag, pulverized coal, and iron concentrate. Production capacity is as follows: small-scale: 5-10 tons per hour; medium-scale: 10-30 tons per hour; large-scale: 30-50 tons per hour.

Operating mechanism and granulation principle

The working principle of a rotary drum granulator is based on the "lifting-scattering-tumbling" cyclic motion of material within a rotating drum. A motor drives the drum to rotate at a low speed. Material is fed from the inlet and rises along the drum wall, then rolls down under gravity. A spraying device evenly sprays water or a binder. Through repeated rolling and collisions, the material continuously increases in size and compacts, forming rounded granules. Substandard fine powder can be returned for regranulation. In compound fertilizer production, steam or chemical reactions can be used to achieve thermal granulation; in organic fertilizer production, low-temperature granulation is used to preserve nutrient activity.

Fermentation process and production line coordination

The upstream of the rotary drum granulator is the fermentation system. Only thoroughly fermented and decomposed materials (moisture content ≤40%, no foul odor) can enter the granulation process. The front section of the equipment can be equipped with a crusher, batching machine, and mixer; the rear section can be equipped with a dryer, cooler, screening machine, coating machine, and packaging machine. The complete production line can realize fully automated production from raw materials to finished products.

Development Prospects and Industry Opportunities

As the global population grows and pressure on food security continues to increase, fertilizer consumption is rising steadily. The continuous expansion of the production capacity of compound fertilizers and organic-inorganic compound fertilizers has formed long-term demand support for fertilizer granulation production lines with drum granulators as the core. At the same time, increasingly stringent environmental protection policies have promoted the resource utilization of organic waste such as breeding manure and urban sludge, opening up a broad market space for drum granulators. The equipment itself is also developing towards large-scale, intelligent and energy-saving directions. With its comprehensive advantages of large output, low energy consumption, wide adaptability and stable operation, the drum granulator has become the core equipment with the most large-scale production value in the field of powder granulation and will play an important role in a wider range of industries in the future.

Models and parameters of rotary drum granulators