2026/11/02
Organic fertilizer dry granulators relies on high mechanical pressure to compress powdered materials directly into granules, without the addition of water or the application of heat. Consequently, this process is best suited for organic materials that have low moisture content, a moderate fiber profile, and have undergone thorough fermentation.
Livestock and poultry manure-based fertilizers: Manure from chickens, pigs, or cattle—once aerobically fermented, matured, dried, and pulverized—can reach a moisture content of below 10%, making it ideal for dry granulation. Since no water is introduced, the energy-intensive drying stage required in wet-granulation processes is eliminated, offering significant economic advantages for large-scale livestock and poultry waste-to-resource projects.
Straw and fungal residue: After fermentation or carbonization, straw can be pulverized; similarly, fungal residue—once matured and dried—possesses a moderate fiber content. When mixed with a small amount of binder, these materials can be fed into a flat die press pelleting machine. High-pressure compression compacts lightweight fibrous materials into dense, robust granules that are resistant to breakage during storage and transport.
Humic acid-based fertilizers: Raw materials such as weathered coal, lignite, or peat naturally feature low moisture content and a loose texture. After activation and pulverization, they can be directly extruded into granules without the need for additional drying. Humic acid granules are used for soil amendment and as additives in compound fertilizers, enjoying stable market demand.
Vermicompost (earthworm castings) and seaweed-based materials are also suitable candidates. Once screened and dried, vermicompost yields uniform, high-organic-matter granules, with dry granulation helping to preserve its natural aggregate structure. Seaweed, when pulverized and blended, can also be extruded into shape, making it well-suited for specialized, differentiated organic fertilizers.
It should be noted that dry granulation imposes strict requirements on the moisture content of the input material—typically controlled between 8% and 15%. If the moisture content is too high, it can cause the pressure rollers to slip or the material to stick to the rollers. Wet, fermented materials must first be dried and pulverized before they can undergo the organic fertilizer dry dranulation process. When selecting equipment, it is essential to evaluate the costs associated with drying the raw materials and consider their fiber characteristics; only then can one determine whether the dry-granulation route is appropriate and effectively leverage the advantages of the equipment.
