Overview
The disc granulator is a core equipment in powder processing industries, designed to agglomerate fine materials into spherical granules through a rotating inclined disc. Its primary use spans fertilizers (e.g., NPK, urea), metallurgical powders, and pharmaceutical intermediates. The machine’s modular design allows customization for capacity (1-30t/h) and automation levels. Unlike extrusion granulators, disc models produce granules with higher sphericity and lower friability, making them ideal for slow-release fertilizers or catalyst carriers. Modern versions integrate PLC controls for real-time adjustment of disc speed (5-25 rpm) and tilt angle (35-55°).
Structure and Working Principle
A standard disc granulator comprises a rotating disc, base frame, gearbox, and spray system. The disc’s rubber or polyurethane lining prevents material adhesion while resisting abrasion. As the disc rotates, raw powder and binder (if needed) are fed continuously; centrifugal force rolls the mixture into layered spheres. Particle size is controlled by adjusting the disc’s inclination—steeper angles yield smaller granules due to faster material turnover. Larger discs (≥3m diameter) often include scrapers to prevent uneven buildup. The process is non-pressure, preserving material properties unlike pellet mills.
Key Features
1. **Angle Adjustment**: Hydraulic or manual tilt mechanisms enable quick adaptation to different materials (e.g., 40° for organic fertilizers, 50° for minerals). 2. **Corrosion Resistance**: Stainless steel construction or ceramic-lined discs are essential for acidic/alkaline materials like ammonium sulfate or phosphate rocks. High-end models feature anti-clogging spray nozzles for liquid binders. 3. **Energy Efficiency**: Compared to drum granulators, disc models consume 20-30% less power per ton, with noise levels below 75 dB.
Application Areas
1. **Fertilizer Industry**: Dominates 60% of usage, producing uniform NPK, DAP, or biofertilizer granules (2-8mm) for improved soil release. 2. **Metallurgy**: Agglomerates iron ore, aluminum oxide, or coal dust into blast furnace-ready pellets. Here, discs withstand temperatures up to 300°C. 3. **Chemicals**: Granulates detergents, catalysts, or pigments where particle shape affects reactivity. Food-grade versions handle salt or sweetener powders.
Maintenance and Precautions
Monthly checks should focus on gearbox oil levels, disc liner wear (replace if >3mm deep grooves), and spray nozzle clogs. Misalignment causes vibration; use laser alignment tools during installation. For abrasive materials like quartz, tungsten carbide-lined discs extend lifespan 3x vs. standard steel. Always shut down before clearing jams—rotating discs pose entanglement hazards. Store indoors when idle to prevent bearing rust.
B2B Procurement Guide
1. **Capacity Matching**: Select models 20% above your peak output to account for binder drying time. A 4m disc typically handles 8-10t/h. 2. **Supplier Evaluation**: Prioritize manufacturers with ISO 9001 certification and on-site testing. Key Chinese producers include Zhengzhou Hengyang and Jiangsu Liangyou. 3. **Cost Factors**: Automation (e.g., automatic feeding) adds 15-25% to base price. EU-made discs cost 2-3x Chinese equivalents but offer longer warranties.
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