Fertilizer granulation
Ammonium sulfate, urea, potassium chloride, potassium sulfate, ammonium chloride, ammonium nitrate, salts and compound fertilizers.
Double-Roll Dry Granulator
Double-Roll Dry Granulator for Fertilizer and Chemical Powders
A versatile ambient-temperature dry granulation system for single-pass production of irregular granules, oblate granules and flake products from fertilizer, pharmaceutical and chemical powders. Designed and manufactured for fertilizer granulation and specialty compound fertilizers. Review the working principle, performance features and available configuration details below when specifying your industrial project.
- Produces 2–6 mm irregular granules, Φ2–Φ10 mm oblate granules and flake products by ambient-temperature dry compaction.
- Published oblate-granule outputs reach 1,300 and 2,100 kg/h depending on roll diameter.
- Can be integrated into compact or high-capacity fertilizer lines with screening recycle, polishing, conditioning, coating, packaging and dust collection.
- Product size
- 2–10 mm options
- Maximum output
- 2,100 kg/h
- Operating temperature
- Ambient
Product Essentials
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Technical Data
Technical specifications
Listed values apply to the identified configuration. Confirm material conditions, utilities and optional equipment before selection.
| Parameter | Motor power: 15 kW | Motor power: 30 kW |
|---|---|---|
| Motor power | 15 kW | 30 kW |
| Hourly output — oblate granules | 900–1,300 kg/h | 1,600–2,100 kg/h |
| Hourly output — irregular granules | 300–700 kg/h | 900–1,600 kg/h |
| Gear reducer | Dedicated hardened-gear reducer | Dedicated hardened-gear reducer |
| Compaction rolls | Forged alloy steel; specially heat-treated; optional hard-chrome plating for rust and wear resistance | Forged alloy steel; specially heat-treated; optional hard-chrome plating for rust and wear resistance |
| Finished-product yield — oblate granules | 60–90% | 60–90% |
| Finished-product yield — irregular granules | 30–60% | 30–60% |
| Available granule diameters | 3.5 / 4.2 / 4.8 / 5.5 / 6.0 / 6.5 / 8 / 10 mm | 3.5 / 4.2 / 4.8 / 5.5 / 6.0 / 6.5 / 8 / 10 mm |
| Product forms | Oblate / irregular / strip / flake | Oblate / irregular / strip / flake |
| Feed moisture — inorganic materials | 2–5% | 2–5% |
| Feed moisture — organic materials | Approx. 6–12% | Approx. 6–12% |
| Operating temperature | Ambient | Ambient |
| Typical process materials | Ammonium bicarbonate, ammonium chloride, ammonium sulfate, urea, ammonium phosphate, superphosphate, calcium magnesium phosphate, potassium chloride, potassium sulfate, potassium magnesium fertilizer, humic acid and organic materials | Ammonium bicarbonate, ammonium chloride, ammonium sulfate, urea, ammonium phosphate, superphosphate, calcium magnesium phosphate, potassium chloride, potassium sulfate, potassium magnesium fertilizer, humic acid and organic materials |
Published output and yield are reference values. Actual performance depends on feed composition, moisture, flowability, required granule form and operating conditions; final selection is subject to material testing and engineering confirmation.
Applications
Double-Roll Dry Granulator for Fertilizer and Chemical Powders: industrial applications
Applications include fertilizer granulation and specialty compound fertilizers. Confirm material properties and process conditions before selecting the equipment configuration.
Specialty compound fertilizers
Production of purpose-formulated compound fertilizers at different nutrient concentrations.
Pharmaceutical powders
Compatible pharmaceutical powder formulations after compaction and material-safety evaluation.
Chemical powders
Suitable inorganic, organic and formulated chemical powders requiring dry shaping without a liquid binder.
Working Principle
From feed preparation to finished product.
The process route is selected around the material and product targets.
Material preparation and mixing
Raw materials are mixed thoroughly to obtain a uniform feed composition.
Controlled feeding
The prepared powder is distributed continuously and uniformly into the adjustable gap between the rolls.
Counter-rotating compaction
One roll is fixed and the other is adjustable; as both rolls rotate toward the nip, the powder is progressively gripped, compressed and formed at ambient temperature.
Crushing and sizing
Compacted sheets or briquettes pass to the crushing section and are reduced to the required granule form.
Classification screening
A screen separates qualified granules from fines and other off-specification material.
Material recycle
Fines and nonconforming granules return to the process for regranulation, while qualified product proceeds downstream.
Performance Highlights
Process performance shaped around the product.
Final performance remains dependent on feed properties and engineering confirmation.
Single-pass dry granulation
Counter-rotating rolls compact the material directly at ambient temperature for one-pass forming without a wet granulation step.
Multiple product formats
The machine can produce 2–6 mm irregular granules, Φ2–Φ10 mm oblate granules and a range of flake products.
Compact construction
A practical, compact arrangement simplifies integration with continuous mixing, conveying, screening, polishing and packaging equipment.
Ambient-temperature operation
The published process forms the product at normal ambient temperature.
Continuous-line integration
The granulator can serve as the core of a mechanized continuous line from raw-material preparation through finished-product packaging.
Energy-conscious design
The dry, direct-forming process is intended to reduce energy demand in fertilizer and powder-granulation applications.
Adjustable roll gap
One roll is fixed while the second can be adjusted to tune compaction and forming conditions.
Closed-loop material use
Screened fines and off-specification granules can be returned for another granulation pass.
System Configuration
Standard process path with project-specific options.
Core equipment and auxiliary systems are selected around the process duty.
Forming and granulation system
Includes the motor, belt drive, dedicated hardened-gear reducer, coupling, transmission wheels, bearing housings, bearings and rolls.
Alloy-steel roll system
Counter-rotating alloy-steel rolls perform compaction; the roll gap is adjustable to match material and product requirements.
Crushing system
Reduces compacted sheets or briquettes into the required granule size.
Small combination line
A typical compact route comprises mixing, granulation, screening, polishing and packaging.
Mixing and feed distribution
A disc mixer homogenizes raw materials before conveying and uniform distribution to the granulator.
Screening and recycle
Qualified granules proceed downstream while rejected material returns to mixing and granulation.
Granule polishing
Polishing improves surface smoothness, fullness and finished-product appearance.
High-capacity complete line
A larger plant may include raw-material treatment, mixing, conveying, granulation, screening, drying, cooling, rounding or coating, weighing, packaging and automatic control.
Drying and cooling
Optional downstream conditioning develops the specified hardness and strength; the source gives a typical granule-strength reference of 28 N.
Coating section
A coating unit can apply the specified material to qualified granules before weighing and packaging.
Dust collection
A cyclone provides primary separation with a stated dust-removal reference of approximately 70%, followed by bag filtration; the published overall efficiency is up to 99.5%.
Centralized electrical control
The control cabinet, variable-frequency drives and related electrical components support centralized monitoring, operation and production management.
Selection Support
Information required for process and line selection.
Share the following feed, product and project data so roll configuration, output and auxiliary equipment can be confirmed.
Material name and formulationOrganic or inorganic classificationFeed moisture contentBulk density and flowabilityRequired granule shape and diameterRequired finished-product outputTarget yield and granule strengthMaterial abrasiveness and corrosivenessRequired upstream and downstream scopeAvailable utilities and control requirements
