Stainless Steel Double Roller Extrusion Granulator for NPK Compound Fertilizer

Manufacturing corrosive chemical formulations—such as high-nitrogen NPK compound fertilizers, ammonium chloride, potassium chloride (MOP), and sulfur-based blends—often leads to severe equipment oxidation and premature component wear in standard carbon steel machinery. The Stainless Steel Double Roller Extrusion Granulator for NPK Compound Fertilizer is an advanced dry-process pelletizing machine engineered specifically with acid-resistant wetted parts to withstand aggressive chemical corrosion while delivering high-density granules without water addition or thermal drying.

Operating on an ambient-temperature dry pressing principle, homogenized chemical raw materials are fed into a mechanical hopper and forcibly compressed between two high-strength, counter-rotating alloy roller shells. The intense mechanical pressing force transforms loose powders into solid, high-density sheets, which are subsequently broken down and sized into uniform spherical or irregular granules. Built by Gofine Machine with food-grade or industrial-grade stainless steel (such as SS304 or SS316L) for all material-contact surfaces, heavy-duty gearboxes, and centralized PLC automation, this corrosion-resistant double roller granulator achieves high single-pass yields, eliminates wastewater discharge, and prevents the thermal degradation of sensitive fertilizer nutrients.

• No Drying Required: Dry extrusion process eliminates the need for drying equipment, saving 30-50% energy
• Wide Application: Suitable for over 20 types of raw materials including NPK, DAP, MAP, ammonium chloride, and organic materials
• High Granulation Rate: ≥90% granulation rate ensures minimal material waste 
• Customizable Granule Shape: Ball, oval, rod, and pill shapes available by changing roller molds
• Low Temperature Operation: Process temperature stays below 40°C, preserving nutrient integrity
• Compact Design: Space-saving footprint suitable for both small and large production facilities

The double roller granulator works on the principle of extrusion granulation. Raw materials are fed into the hopper and transported to the gap between two counter-rotating rollers. The rollers, equipped with matching hemispherical cavities, compress the material into dense granules as they pass through. The compacted sheets are then broken into individual granules and screened to the desired size.
Unlike wet granulation methods, this dry extrusion process requires no drying or cooling equipment, significantly reducing energy consumption and production costs.

Applicable Raw Materials
NPK compound fertilizers (urea, DAP, MAP, ammonium chloride, ammonium sulfate)
Organic materials (chicken manure, cow dung, pig manure after composting)
Mineral fertilizers (potassium chloride, potassium sulfate)
Bentonite, kaolin, and other industrial powders
Cat litter and absorbent materials

Application Scenarios
NPK compound fertilizer production lines (1-50 t/h)
Organic fertilizer granulation plants
BB fertilizer manufacturing facilities
Cat litter and industrial granule production
Mineral powder granulation

Why Choose Gofine's Double Roller Granulator?
10+ years of manufacturing experience
ISO9001 quality certified, CE compliant
Customizable roller materials (stainless steel, alloy steel) for different applications
OEM/ODM service available
Complete after-sales support including installation and training
Exported to 50+ countries worldwide

FAQ
Q: What granule sizes can the double roller granulator produce? A: Standard sizes range from 3mm to 10mm. Custom sizes
are available upon request by changing the roller mold.
Q: Does the machine require a binder for granulation? A: For most compound fertilizer materials, no binder is needed. For
some organic materials with low stickiness, a small amount of binder may be required.
Q: What is the delivery time? A: Standard models: 15-20 days. Customized models: 25-35 days.
Q: Do you provide installation service? A: Yes, we provide on-site installation, commissioning, and operator training. Remote
guidance is also available.
Q: What warranty do you offer? A: 12 months warranty from the date of delivery, excluding wearing parts (roller skins).

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