Fertilizer Sizing Mill, Doebritz Industrial Pulverizer, High-Capacity / ATEX Certified
Doebritz Fertilizer Sizing Mill for high-capacity pulverizing. ATEX certified, CNC machined rotors, minimal air leakage. OEM custom engineering for bulk solids. Get a quote.
Product Summary
The Doebritz Fertilizer Sizing Mill is a heavy-duty industrial pulverizer engineered for the continuous, high-volume processing of granular fertilizers, agrochemicals, and crystalline bulk solids. With a maximum throughput capacity of 50 t/h and a robust ATEX-certified explosion-proof housing (Zone 22), this mill ensures consistent particle sizing between 0.5mm and 5.0mm. Designed for 24/7 operation in pneumatic conveying and gravity-fed systems, the Doebritz mill offers minimal air leakage and ultra-low maintenance downtime.
Why Source Doebritz Fertilizer Sizing Mill
- Superior Wear Life: Housing and rotor manufactured from abrasion-resistant cast iron or SS316L, with a hardness of up to 450 HB, extending service life by 3X compared to standard mills.
- Precision Particle Control: CNC-machined rotor blades with adjustable gap settings (0.3mm – 1.5mm) ensure 95% uniform particle size distribution for downstream blending or bagging.
- Lowest Air Leakage Rate: Advanced shaft sealing technology with labyrinth + purge air ports guarantees leakage rates below 0.005 m3/min, critical for pneumatic conveying systems.
- Explosion-Proof Compliance: Full ATEX Zone 22 certification (II 3D Ex tc IIIC T120°C Dc) and optional SIL 2 capability for hazardous fertilizers like Ammonium Nitrate.
- Global OEM Supply & Customization: Doebritz offers non-standard flanges (DIN/ANSI/JIS), hardfacing options, and heated/cooled housings for sticky fertilizers.
Housing & Rotor Engineering
The Doebritz Fertilizer Sizing Mill features a monobloc cast housing with a segmented liner design, allowing rapid field replacement of wear zones without disassembling the shaft. The rotor geometry utilizes a staggered 12-vane or 16-vane configuration with tungsten carbide-tipped cutting edges, specifically optimized for fibrous, hygroscopic, and abrasive fertilizers. Outboard-mounted, sealed spherical roller bearings isolate the rotor from the housing, preventing product contamination and enabling operating temperatures from -20°C to +180°C. A patented air-purge seal system prevents fine dust migration into the bearing housing, drastically reducing fire risk.
Technical Specifications
Standard engineering data for the Doebritz Fertilizer Sizing Mill series (Model DSM-400 to DSM-1200). Custom parameters available upon request.
| Specification | Detail |
|---|---|
| Body Material | Cast Iron GG25 / Stainless Steel 304 / SS316L |
| Rotor Design | Staggered 12 or 16 Vane with Tungsten Carbide Tips |
| Inlet Size (DN) | 150mm to 600mm (6 to 24 inches) |
| Capacity (Max) | 50 t/h (Urea-based, 0.8 specific weight) |
| Max Rotor Speed | 150 RPM (VFD ready) |
| Pressure Rating | -0.5 bar to +3.5 bar |
| Operating Temp | -20°C to +180°C (Options to +250°C) |
| ATEX Certification | II 3D Ex tc IIIC T120°C Dc (Zone 22) |
Heavy-Duty Application Scenarios
Pneumatic Conveying Systems (Dilute & Dense Phase)
Integrated directly into rotary airlock feeders, the Doebritz mill conditions and conveys prilled urea, DAP, and potash without bridging or shearing, maintaining flow rates up to 40 m3/h.
Silo Discharging & Lump Breaking
Mounted beneath large storage silos, the mill breaks down solidified or caked fertilizer lumps (up to 100mm feed size) ensuring reliable gravity discharge while preventing rat-holing.
Dust Collection & Product Recovery
Connected to baghouse filters, the mill recovers oversized particles and re-introduces them into the production line, minimizing waste and improving yield.
Frequently Asked Questions
- What is the standard lead time for a Doebritz Fertilizer Sizing Mill?
- Standard models (cast iron housing) are available within 4-6 weeks. Stainless steel or ATEX-certified units require 8-10 weeks due to specialized welding and non-destructive testing (NDT). Express assembly (3 weeks) is available for critical breakdowns.
- Can Doebritz customize the flange to match my existing pneumatic conveying pipeline?
- Yes. Doebritz supports non-standard flange drilling (DIN EN 1092-1, ANSI B16.5, JIS B2220, and AS 2129). Simply provide your flange standard and mating dimensions in your RFQ. A custom machining surcharge applies.
- Is the mill ATEX certified for Zone 21 or Zone 22?
- Our standard DSM mill is ATEX certified for Zone 22 (dust clouds occasionally). For Zone 21 (dust clouds likely), we offer an upgraded housing with reinforced explosion venting and earth continuity, certified as Ex h IIIC T120°C Db.
- What high-temperature options are available for processing heated fertilizers?
- For product temperatures up to 250°C, Doebritz offers a ‘Thermal-Plus’ package including water-cooled bearing housings, high-temp Viton seals, and carbon-filled rotor end-plates to prevent thermal expansion seizures.
- How do you achieve such low air leakage during rotary valve operation?
- Our proprietary ‘Quad-Seal’ system combines a primary compression seal, a secondary labyrinth with purge air (0.2 bar), a grease-packed intermediate cavity, and an outboard V-ring. This maintains leakage below 0.005 m3/min at 1 bar differential pressure.
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