The double roller extrusion granulator compacts prepared fertilizer powders into granules through mechanical pressure. It is suitable for selected NPK, compound fertilizer and other dry formulations, offering a compact granulation process with flexible roller-pocket designs and customized configurations.
The LAZD series double roller extrusion granulator is designed to compact prepared fertilizer powders into dense granules through mechanical pressure. It is suitable for selected NPK blends, urea-based fertilizers, ammonium sulfate formulations, potassium fertilizer blends, compound fertilizer powders and other dry materials with suitable flowability and compactibility.
Unlike wet granulation systems, the double roller extrusion granulator forms granules without liquid spraying during the compaction stage. The prepared material is fed between two counter-rotating rollers, compressed into briquettes or a compacted sheet, crushed and screened to obtain the required granule size. Fines can be returned to the feeding system for further processing.
The final capacity, granule strength, granule shape and screening performance depend on the material formulation, moisture content, particle size, bulk density, roller-pocket design and operating conditions. A material test is recommended before confirming the final equipment model and process configuration.
The following are reference specifications for the LAZD series.
| Model | Capacity (tph) | Power (kw) | Size (mm) | Roller Size (mm) | Rotation Speed (rpm) |
|---|---|---|---|---|---|
| LAZR-1.0 | 0.8-1 | 11-15 | 1200 × 700 × 1000 | Φ150 × 220 | 1450 |
| LAZR-1.5 | 1-1.5 | 11-15 | 1300 × 800 × 1100 | Φ150 × 300 | 1450 |
| LAZR-2.0 | 2-3 | 22 | 1630 × 850 × 1650 | Φ168 × 300 | 1450 |
| LAZR-3.0 | 3-4.5 | 30 | 1900 × 1050 × 1200 | Φ300 × 300 | 1450 |
1. Material preparation
The raw materials are proportioned and mixed according to the required fertilizer formulation. Before entering the granulator, the material should have suitable particle size, flowability and moisture content. Oversized particles, foreign matter and excessive moisture should be removed or adjusted during pretreatment.
For compound fertilizer production, common preparation equipment may include a batching system, crusher, mixer, conveyor and storage hopper. The exact configuration depends on the raw materials and the required production capacity.
2. Roller compaction
The prepared powder enters the feeding area and moves toward two counter-rotating rollers. Mechanical pressure compresses the material between the roller surfaces. The roller sheets contain pockets or grooves that determine the approximate shape and size of the compacted product.
The compaction performance depends on the material’s compressibility, particle size distribution, moisture, formulation and bulk density. For this reason, the same machine may produce different results when processing different fertilizer formulations.
3. Crushing
The compacted briquettes or sheets leave the roller section and enter the crusher. The crusher breaks the compacted material into smaller particles. The crushing stage is adjusted according to the required granule size and product shape.
4. Screening and recycling
The crushed material passes through a screening machine. Qualified granules are collected as the final product, while oversized particles can be returned for crushing and undersized material can be recycled to the feeding system. This closed-loop arrangement helps improve material utilization and maintain a consistent product size.
Dry compaction process
The machine compacts prepared powders through mechanical pressure instead of forming granules through liquid agglomeration. This can simplify the process for suitable dry fertilizer formulations.
Flexible roller-pocket design
Different roller sheets can be selected or customized for different granule shapes and sizes. The correct design should be determined according to the target product, material behavior and required output.
Compact process layout
A dry compaction line can have a simpler layout than a wet granulation line because it may not require a complete wet-granulation drying and cooling section. The actual equipment list still depends on the formulation, moisture requirements, dust-control requirements and final product standard.
Easy integration into a fertilizer plant
The granulator can be integrated with feeders, crushers, mixers, conveyors, screens, bucket elevators, dust-collection equipment and packing machines to form a complete fertilizer production line.
Customized equipment selection
We can recommend the granulator model, roller-pocket pattern and auxiliary equipment according to your raw materials, target capacity, product size, plant layout and operating requirements.
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