The rotary drum granulator is a key piece of forming equipment in the compound and organic fertilizer industries, suitable for both cold and hot granulation processes as well as the large-scale production of high-, medium-, and low-concentration compound fertilizers. Utilizing a wet agglomeration granulation process, the equipment employs water or steam to adjust the moisture content of the base fertilizers within the drum, facilitating a complete chemical reaction; subsequently, the rotation of the drum generates the compressive forces necessary for the material particles to agglomerate into granules in the liquid phase. Thanks to core advantages such as high production capacity, high granule strength, and broad raw material adaptability, the rotary drum granulator has become the standard granulation equipment for large- and medium-sized organic fertilizer plants and compound fertilizer processing enterprises.
Core Process Flow: Raw material feeding; Lifting and tumbling within the drum; Steam/liquid-phase reaction; Particle compression and agglomeration; Continuous discharge; Post-processing.
The working principle of the rotary drum granulator can be summarized as rotary agglomeration and wet-process forming.; The main motor drives a belt and pulley system, transmitting power through a reducer to the drive shaft; a split gear mounted on the drive shaft meshes with a large gear ring fixed to the drum body, causing the drum to rotate. Materials enter the rotating drum from the feed end.
As the drum rotates, the materials undergo a cyclic motion of lifting, scattering, and tumbling; along the drum wall, driven by the combined forces of centrifugal force, gravity, and friction. Simultaneously, steam, gaseous ammonia, or additives such as phosphoric acid, nitrogen solutions, ammonium phosphate slurries, or triple superphosphate slurries are introduced into the drum to facilitate the chemical reactions and heat supply required for compound fertilizer granulation; alternatively, a small amount of water may be added for cold granulation. Under specific humidity and temperature conditions, compressive forces between material particles cause them to adhere and agglomerate into spherical granules.
Continuous, large-scale production is achieved through the constant feeding of materials and the continuous rotation of the granulator. The formed granules are discharged from the outlet end as the drum rotates and proceed to subsequent screening, drying, and packaging stages.
The rotary drum granulator offers exceptional versatility regarding raw material compatibility and is widely applicable in the following scenarios:
Powdered livestock and poultry manure (such as composted chicken, cattle, and pig manure) and agricultural solid waste (such as straw powder, mushroom residue, distillers' grains, and humus soil). It ensures stable granulation for both high-fiber materials (e.g., cattle and sheep manure) and protein-rich materials (e.g., pig, chicken, and duck manure).
Powdered single-nutrient fertilizers (N, P, K), secondary and trace element additives, and chemical powders such as monoammonium phosphate (MAP) and potassium chloride. It is suitable for producing high, medium, and low-concentration compound fertilizers.
Blends of fermented organic fertilizer and chemical fertilizer powders; it can produce a variety of products, including pure organic fertilizers, organic-inorganic compound fertilizers, and granular soil conditioners. It can process both dry and wet materials.
A standalone rotary drum granulator performs only the core granulation process; to achieve standardized, automated mass production, it must be integrated with a full suite of auxiliary equipment to form a closed-loop production line. The configuration of auxiliary equipment can be flexibly adjusted based on production capacity requirements. Key auxiliary equipment includes:
Rotary drum granulator
Small-scale workshops may simplify the equipment setup, whereas large and medium-sized factories are advised to install the complete system to ensure consistent production capacity and product quality.
Zhengzhou Huaqiang Heavy Industry Technology Co., Ltd. specializes in the fertilizer machinery sector, independently developing, manufacturing, and selling a full range of fertilizer processing equipment. Thanks to the following advantages, the Huaqiang rotary drum granulator has become the preferred choice for numerous organic and compound fertilizer plants:
Drum specifications can be customized to meet client requirements; a single unit offers a processing capacity of 15–20 tons per hour, making it suitable for high-volume granulation operations. The equipment integrates seamlessly with crushers, mixers, and dryers, enabling an all-in-one process covering raw material handling, mixing, granulation, and drying.
Drum specifications can be customized to meet client needs, with a single unit capable of processing 15–20 tons per hour—ideal for high-volume granulation operations. The equipment integrates seamlessly with crushers, mixers, and dryers to create a unified workflow covering raw material processing, mixing, granulation, and drying.
The drum body is constructed from welded, heavy-gauge steel plate and features an internal wear-resistant, anti-corrosive lining. It withstands prolonged exposure to moist or corrosive materials without significant wear or rust, ensuring a robust, long-lasting machine. Core components are designed for both durability and efficiency, offering a service life of 8–10 years.
We provide complete production line layout planning as well as on-site installation and commissioning services. Visiting clients are welcome to bring their own materials for free trial runs.
| Model | Diameter(mm) | Length(mm) | Inclination(°) | Rotation Speed(r/min) | Capacity(t/h) | Motor Power(Kw) |
| ZG1.2*4.0 | 1200 | 4000 | 2.5 | 17 | 1-3 | 5.5 |
| ZG1.5*6.0 | 1500 | 6000 | 2.5 | 11.5 | 3-5 | 7.5 |
| ZG1.8*7.0 | 1800 | 7000 | 2.5 | 11.5 | 6-10 | 18.5 |
| ZG2.0*8.0 | 2000 | 8000 | 2.5 | 11 | 10-15 | 22 |
| ZG2.2*12 | 2200 | 12000 | 2.5 | 10.5 | 15-20 | 37 |
