Rotary Drum Granulator for Compound Fertilizers

Product Specifications

Technical details and manufacturing context for Rotary Drum Granulator for Compound Fertilizers

Definition

A rotary drum granulator is a core industrial machine in fertilizer manufacturing plants that transforms powdered raw materials into uniform, spherical granules through a continuous tumbling and agglomeration process. It plays a critical role in the production of compound fertilizers (NPK) by ensuring consistent particle size, improved nutrient homogeneity, and enhanced physical properties like crush strength and flowability. This equipment is essential for B2B supply chains as it directly impacts product quality, handling efficiency, and marketability for bulk fertilizer producers, enabling them to meet specific agricultural grade specifications and packaging requirements. The granulator operates on a simple yet effective principle: powdered materials are fed into a rotating inclined drum, where they tumble and coalesce into granules, often aided by a liquid binder spray. Granules grow through layering and are discharged at the opposite end. Key design parameters include drum diameter (1.0–3.6 m), length (3–12 m), rotational speed (6–15 rpm), inclination angle (2–5 degrees), motor power (15–132 kW), production capacity (5–50 t/h), operating temperature (0–80 °C), granule size range (1–4 mm), granulation rate (≥90%), and weight (10–60 t). Materials of construction include carbon steel (Q235B) for the drum shell, stainless steel (316L) for internal liners and spray systems, and wear-resistant alloys for lifter plates. The equipment is rated IP54–IP65 for dust and moisture protection. These values are reference ranges; actual specifications must be confirmed with the manufacturer for specific models and applications. Standards such as GB/T 700 and GB/T 1220 are listed as procurement references, not as certification guarantees. Buyers should verify compliance with applicable standards and ensure the equipment meets their process requirements.

Working Principle

Powdered fertilizer materials are fed into a rotating inclined drum; as the drum rotates, the material tumbles and coalesces into granules, often aided by a liquid binder spray; granules grow in size through layering and are discharged at the opposite end. The drum's inclination and rotational speed control residence time and tumbling action, while the binder promotes agglomeration. The process yields uniform granules with adjustable size within 1–4 mm, and a granulation rate of ≥90% under optimal conditions.

Common Materials

Carbon Steel (Drum Shell), Stainless Steel (Internal Liners/Spray System), Wear-Resistant Alloy (Lifter Plates)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Drum DiameterRequired	1.0–3.6 m	Internal diameter of the rotating drum cylinder.
Drum LengthRequired	3–12 m	Axial length of the drum, affecting residence time.
Rotational SpeedRequired	6–15 rpm	Operating speed of the drum, controlling tumbling action.
Inclination AngleRequired	2–5 degrees	Tilt of the drum axis, governing material flow rate.
Motor PowerRequired	15–132 kW	Power rating of the main drive motor.
Production CapacityRequired	5–50 t/h	Design throughput of granular product.
Operating Temperature	0–80 °C	Material temperature range for optimal granulation.
Granule Size Range	1–4 mm	Adjustable via process parameters.
Granulation Rate	≥90 %	Percentage of product within target size range.
Material	Q235B / 316L	Carbon steel for standard, stainless for corrosive materials.GB/T 700, GB/T 1220
Weight	10–60 t	Increases with drum size and material.
IP Rating	IP54–IP65	Higher rating for dusty or wet environments.IEC 60529

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Rotating Drum Shell
Main cylindrical vessel where granulation occurs.

Material: Carbon steel with protective lining
Main Drive System
Provides rotational torque to the drum via motor, reducer, and girth gear.

Material: Steel, alloy gears
Support Rollers and Thrust Rollers
Support the drum's weight and control axial movement.

Material: Forged steel with hardened surfaces
Internal Lifter Plates Part
Lift and cascade material to promote tumbling and granule formation.

Material: Wear-resistant steel or alloy
Liquid Binder Spray System Optional
Distributes liquid binder (e.g., water, solution) uniformly into the powder bed.

Material: Stainless steel nozzles and piping

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Rotary Drum Granulator for Compound Fertilizers.

Manufacturers of Rotary Drum Granulator for Compound Fertilizers

Manufacturer profiles associated with Rotary Drum Granulator for Compound Fertilizers.

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Frequently Asked Questions

What is the typical capacity range of a rotary drum granulator?

The design throughput is typically 5 to 50 tons per hour, depending on drum size and process conditions. Actual capacity must be confirmed with the manufacturer for your specific material and requirements.

What materials are used in the construction of the granulator?

The drum shell is typically carbon steel (Q235B), internal liners and spray systems are stainless steel (316L), and lifter plates are made of wear-resistant alloy. Material selection depends on the corrosiveness of the fertilizer components.

How is granule size controlled?

Granule size is influenced by drum speed, inclination, binder addition, and feed characteristics. The achievable range is typically 1 to 4 mm, with a granulation rate of at least 90% under optimal conditions. Adjustments are made via process parameters.

What standards apply to this equipment?

Material standards such as GB/T 700 for carbon steel and GB/T 1220 for stainless steel are listed as references. The IP rating (IP54–IP65) follows IEC 60529. These are procurement references; verify compliance with the manufacturer for your specific model.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric (non-pressurized operation)
flow rate:	5-50 tons/hour (capacity varies with drum size and design)
temperature:	Ambient to 80°C (process-dependent, typically 40-60°C for optimal granulation)
drum inclination:	1-5 degrees (adjustable for residence time control)
rotational speed:	10-25 RPM (varies with drum diameter)
slurry concentration:	40-70% solids by weight (optimal 50-60% for proper granule formation)