Double roller press granulation lines: How to overcome fertilizer granulation challenges?

In the fertilizer granulation field, double roller press granulation lines, with their unique advantages of requiring no drying and low energy consumption, have become a key solution to the granulation challenges of high-moisture and heat-sensitive raw materials. Rather than operating as a single piece of equipment, they work in conjunction with multiple fertilizer equipment types to directly compress powdered raw materials into granules, opening up a new and efficient path for fertilizer production. After the double roller press granulation production line starts, the raw materials first enter a vibration screener machine, which, like a "fine screening," removes impurities and large lumps, ensuring uniform particle size and laying the foundation for subsequent granulation. Next, qualified raw materials are conveyed to a double axis mixer. If the raw materials have uneven moisture or composition, the mixer can add a small amount of auxiliary materials and thoroughly mix them to achieve more stable material properties. The core process is led by a double-roller extrusion granulator. Its two steel rollers rotate against each other, forcibly squeezing the incoming material into thin flakes. The material is then crushed by a crushing mechanism, and a drum screener selects the granules that meet the specifications. Unqualified granules are returned to the mixing stage, achieving zero raw material waste. The entire granulation process does not require high-temperature drying, which not only saves energy but also preserves volatile nutrients in the fertilizer. It is particularly suitable for the production of heat-sensitive fertilizers such as organic fertilizers and bio-fertilizers. The production line is also equipped with an automatic quantitative packaging machine and a belt conveyor. After granulation, qualified granules are conveyed via a conveyor to a packaging machine, where they are precisely packaged into standard bags weighing 25-50 kg. This fully automated process reduces manual intervention and improves packaging efficiency and accuracy. Compared to traditional granulation lines, the double-roll extrusion granulation line eliminates the need for a drying step, reduces energy consumption by over 30%, and can accommodate a wide range of raw materials.