In fertilizer project investment, how to achieve the highest output efficiency with the lowest equipment investment is a question that every investor repeatedly weighs. Double roller extrusion granulation technology naturally has a low-input advantage because it does not require drying and heat source systems. However, low input does not mean simple assembly; reasonable configuration is necessary to achieve maximum output within a limited budget.
Core Equipment Selection—The extrusion granulator is the “heart” of the entire line. The quality of the extrusion granulator (fertilizer roller press machine/double roller press granulator) directly determines the particle strength, granulation rate, and operational stability. It is recommended to prioritize models with a roller diameter ≥500mm and a roller width ≥250mm, which can cover the production needs of most organic fertilizers and compound fertilizers. The hydraulic system should adopt an independent oil station design, equipped with an accumulator for pressure holding, ensuring that the extrusion pressure fluctuation is ≤±5%. The two rollers are made of alloy steel forgings with a wear-resistant layer welded to the surface, with a service life ≥8000 hours.
Auxiliary System Selection – Which Steps Can Be Simplified? The pretreatment section can omit the high-cost ultrafine grinding equipment; a standard semi-wet material grinder can be used to control the material fineness to above 60 mesh. A horizontal single-shaft ribbon mixer (costing only 60% of a twin-shaft mixer) can be selected for mixing, and the mixing time per batch can be extended to 6-8 minutes to achieve the same result. A drum screen can be used instead of a vibrating screen for the screening system (30% cheaper and easier to maintain), but attention must be paid to the frequency of screen cleaning.
Modular Layout Saves on Civil Engineering Investment. The six modules of crushing, mixing, extrusion, crushing, screening, and packaging are arranged compactly, shortening belt conveyor distances and reducing transfer points. A steel structure platform replaces concrete floors, shortening the construction period by 3-4 weeks. The entire line can be arranged in a standard 800-1500㎡ plant, saving more than 40% of the floor space compared to a wet granulation line with the same capacity.