In the field of compound fertilizer granulation, the double roller press granulator represents a mature and practical choice. Instead of relying on liquid-phase granulation, it uses mechanical pressure to compress a mixture of fertilizer powders directly into granules. This enables the consistent production of uniform, solid granules, even when handling formulations such as high-nitrogen, high-potassium, or organic-inorganic hybrid types. An increasing number of compound fertilizer manufacturers are adopting this equipment as their primary granulation unit or as a flexible addition to production lines for product diversification.

In a fertilizer production line, the disc granulator plays a pivotal role, bridging the upstream batching and mixing systems with the downstream drying, screening, and packaging stages. It is here that the material transforms from powder into granules. The equipment itself is uncomplicated; operators standing nearby can intuitively assess the quality of the granulation. The disc granulator has maintained a strong position in the industry not through complex technology, but through tangible advantages: simplicity, reliability, ease of operation, and ease of maintenance. For fertilizer manufacturers, it represents a time-tested, mature solution.

The flat die pelleting machine is a mature and widely used extrusion-type granulation machine in the organic fertilizer processing industry. In organic fertilizer production, the granulation stage often poses the greatest challenge to equipment adaptability due to the high fiber content, fluctuating moisture levels, and inconsistent impurity content of organic materials. The flat die pelleting machine has established a strong foothold in this field thanks to its stability and resilience in the face of these demanding conditions. For users who wish to produce organic fertilizer in a marketable granular form without investing excessive effort in equipment operation and maintenance, the flat die pelleting machine—proven through extensive production practice—is a reliable choice.

The ring die pelleting machine holds a prominent position in the feed and organic fertilizer processing industries due to its unique structural advantages and mature process system. In the feed industry, ring die pelleting machines are the standard configuration for pelleting compound feed and aquatic feed, and can be found on almost every large-scale feed production line. In the organic fertilizer processing sector, as the industry shifts from scattered small workshops to large-scale factories, ring die pelleting machines are gradually replacing flat die pelleting machines as the preferred model for newly built large and medium-sized organic fertilizer plants. Stable equipment operation, quantifiable control of process parameters, and high product pellet consistency make it a core piece of equipment worthy of serious evaluation by processing enterprises pursuing both production capacity and product quality.

The rotary drum granulator plays a pivotal role—often described as the “mainstay”—in the compound fertilizer industry. It is a core component in the process flow of almost all large-scale fertilizer production lines with daily outputs exceeding several hundred tons. Its widespread adoption stems from its tangible industrial value: it transforms mixed powdered fertilizer into uniform, spherical granules within an enclosed drum in a single pass, ensuring a continuous process and a steady, consistent output. Rather than relying on large amounts of added water, the process ingeniously utilizes steam heat to trigger internal material reactions that generate a binding liquid phase; this results in dense granules and reduces the subsequent drying load.