In industries such as fertilizers, chemicals, building materials, and metallurgy, the hydraulic roller granulator is increasingly becoming the core equipment for the dry granulation of high-hardness materials. Unlike traditional wet granulation processes, this machine utilizes dual-roll extrusion technology and a hydraulic forced-feeding system to achieve single-step forming without the need for liquid binders. The resulting granules—typically oblate or pillow-shaped—feature high strength and low fines content, facilitating subsequent packaging, transportation, and storage.

How does a hydraulic roller granulator produce fertilizer?

The hydraulic roller granulator employs a dry extrusion granulation process; the entire operation requires no water addition or drying, and the core principle can be summarized as “cold-press molding”:

Forced Feeding

Material enters the gap between two counter-rotating rollers via screw or gravity feed. Huaqiang Equipment utilizes a horizontal forced-feeding design to prevent material “bridging” and ensure a continuous, stable supply.

High-Pressure Extrusion

Compressive forces ranging from tens to hundreds of tons are generated between the rollers, compacting powdered material into high-density, ribbon-like sheets (or “cakes”). The hydraulic system provides adjustable, constant pressure, ensuring optimal molding results for various types of materials.

Crushing and Granulation

The compacted sheets enter the crushing and granulation system, undergoing two stages of crushing (coarse and fine) to form uniform granules.

Screening and Classification

Finished granules are sorted via a vibrating screen; qualified granules proceed to packaging, while undersized fines are automatically recycled for re-granulation, creating a fully enclosed loop with zero waste generation.

Throughout the process, the material forms naturally through intermolecular forces and mechanical interlocking without the need for binders. The resulting granules possess high strength and resistance to crumbling, making them particularly suitable for premium fertilizer products that demand strict granule hardness standards.

Application Scope of Hydraulic Roller Granulators

Hydraulic roller granulators are widely used in fertilizer production across the following sectors:

1. Organic Fertilizer Granulation: Processes organic materials such as fermented livestock manure, crop straw, and municipal sludge. As no drying process is required, the activity of organic matter and beneficial bacteria is preserved to the greatest extent; the resulting granules are round and uniform, making this the preferred equipment upgrade for organic fertilizer plants.

2. Compound Fertilizer and BB Fertilizer Raw Material Preparation: Suitable for NPK compound fertilizers, slow/controlled-release fertilizers, and more. It handles the granulation of mixed raw materials——such as urea, ammonium phosphate, and potassium sulfate——producing high-strength granules that facilitate subsequent blending, packaging, and transport.

3. Bio-bacterial Fertilizer: The low-temperature extrusion process preserves microbial activity, resolving the industry-wide issue of massive bacterial die-off caused by traditional high-temperature drying methods.

4. Mineral Fertilizer: Processes materials such as phosphate rock powder, potassium salts, and rare-earth mineral powders, converting powdered minerals into granules to reduce dust loss during transportation and application.

Additionally, this equipment finds established applications in non-fertilizer industries——such as chemical raw materials, carbon black, and feed additives——offering versatility and a high return on investment.

What services come with purchasing a Huaqiang hydraulic roller granulator?

When you choose Huaqiang, you gain more than just a piece of equipment; you receive a comprehensive granulation production line solution. We provide full-lifecycle service covering pre-sales, in-process, and post-sales stages:

Pre-sales process design: Based on your raw material characteristics, target production capacity (100,000-200,000 tons/year), and facility conditions, we provide free process flow charts and workshop layout recommendations to prevent wasted investment caused by incorrect equipment selection.

Customized manufacturing: We offer non-standard customization of parameters——such as roller diameter, motor power, and hydraulic system pressure——to ensure the equipment perfectly matches your material properties.

On-site installation and commissioning: We dispatch a technical team to supervise installation and handle full-machine commissioning and trial runs, ensuring a smooth start to production.

Operational training: We provide systematic training for your operators and maintenance staff——covering operating procedures, routine maintenance essentials, and hydraulic system troubleshooting——to ensure long-term, stable equipment operation.

Genuine spare parts supply: We supply a full range of genuine parts——including roller shells, hydraulic cylinders, and seals——with rapid shipping within 7 days to minimize downtime.

Why Choose Huaqiang?

Huaqiang boasts over 20 years of experience in the R&D and manufacturing of extrusion granulation equipment. Our products are ISO9001 certified and exported to numerous countries and regions across Southeast Asia, Africa, and South America. Adhering to a design philosophy of practicality, durability, and ease of use, we subject every hydraulic roller granulator to rigorous pressure testing and no-load operational trials to ensure superior quality upon delivery.