Dry Granulation Mill, Doebritz Industrial Mill, High-Shear / ATEX Certified

Product Summary

Doebritz presents the next generation of Dry Granulation Mill technology, engineered for high-capacity size reduction of dry powders, agglomerates, and friable materials. With throughput capacities ranging from 500 kg/h to 25+ t/h, this mill features an ATEX-certified heavy-duty housing, precision CNC-machined rotor, and superior dust containment. The Doebritz dry granulator delivers consistent granule size with minimal fines, making it the preferred choice for continuous industrial milling processes.

Why Source Doebritz Dry Granulation Mill

Choosing Doebritz as your dry granulation mill supplier provides a decisive competitive edge in operational efficiency and total cost of ownership.

• Superior Milling Precision: Our mills feature dynamically balanced, CNC-machined rotor blades with selectable clearance adjustments (down to 0.2 mm), ensuring uniform particle size distribution and minimal material waste.
• Zero Contamination Design: The housing and rotor are manufactured from Stainless Steel 316L with a mirror-polished (Ra ≤ 0.8 µm) product contact surface, ideal for pharmaceutical, food, and chemical applications requiring strict hygiene standards.
• ATEX Certified Explosion Protection: All Doebritz dry granulation mills come standard with ATEX Zone 22/21 certification for safe operation in explosive dust atmospheres, including integrated grounding and pressure-relief panels.
• Global OEM Supply Capabilities: Backed by 15 years of heavy-industry supply, we provide complete engineering documentation, FAS preparation, and rapid spare parts logistics for integration into your existing process lines.
• Minimal Air Leakage & Dust Emission: Specially designed shaft sealing system (labyrinth + air purge) reduces leakage rate to < 0.5 Nm³/h, preserving product loss and ensuring a clean working environment.

Housing & Rotor Engineering

The Doebritz Dry Granulation Mill is built around a robust, one-piece cast housing (optional fabrication for ultra-heavy duties) that absorbs high torque loads without deformation. The staggered rotor design incorporates replaceable carbide-tipped blades arranged in a helical pattern, reducing peak stress and enabling self-cleaning action during operation. Outboard-mounted, grease-lubricated heavy-duty bearings isolate the milling chamber from lubricants, while the quick-release screen cradle allows rapid mesh changes without tools. Every unit is hydrostatically tested to 10 bar(g) and undergoes 100% run-in validation prior to dispatch.

Technical Specifications

Below are the standard ratings for the Doebritz dry granulation mill series. Custom configurations (flange dimensions, drive power, surface finish) are available upon request.

Specification	Detail
Model Range	DGM-200 to DGM-800
Capacity (t/h)	0.5 – 25 (depending on mesh size and material density)
Main Shaft Power	5.5 kW – 90 kW
Body Material	Cast iron GG25 / Stainless Steel 304 / 316L
Rotor Design	Staggered, 4 to 8 rows, replaceable hardened blades
Max Operating Temp	Standard 80°C / High-temp option 280°C
Explosion Protection	ATEX Cat. 2 (Zone 21 / 22) Certification
Leakage Air Rate	< 0.5 Nm³/h (with air purge seal)

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Installed directly upstream of dense or dilute phase conveyors, the Doebritz dry granulator reduces oversized agglomerates that cause line blockages, ensuring steady material flow and protecting downstream rotary valves and filters.

Silo Discharging & Comminution

Mounted under silos or hoppers processing hygroscopic or caked powders (e.g., milk powder, carbon black, titanium dioxide), the mill breaks lumps into free-flowing granules, preventing bridging and improving discharge reliability.

Dust Filter Collectors

For reclaiming valuable materials from baghouse or cartridge filter discharge, the low-speed, high-torque design of Doebritz mills transforms compacted dust fines into marketable granules, reducing waste disposal costs.

Frequently Asked Questions

What is the typical lead time for a Doebritz Dry Granulation Mill?

Standard units (cast iron / SS304, 7.5–45 kW) are shipped within 4–6 weeks after order confirmation. Fully ATEX-certified or custom flange configurations may require 8–10 weeks. Express assembly is available for qualified OEMs.

Can you customize the inlet/outlet flange dimensions to match existing equipment?

Yes, Doebritz offers complete flange customization (ANSI, DIN, JIS, or custom drilling patterns) at no additional engineering charge for batch sizes ≥5 units. Single units are subject to a one-time design fee.

Does the mill include ATEX certification for Zone 21?

All Doebritz Dry Granulation Mills are offered with optional full ATEX Zone 21/22 certification including documentation, nameplate, and certified pressure relief panels. A non-ATEX industrial version is also available.

What high-temperature configurations are possible?

With a graphite purge seal, high-temp grease, and expanded rotor-stator gap, the mill can process materials up to 280°C (536°F). Water-cooled housing option extends capability to 400°C for hot calcined products.

Do you provide after-sales support and wear parts globally?

Absolutely. Doebritz maintains regional stocking hubs in Houston, Rotterdam, and Shanghai. Spare parts (blade sets, screens, seal kits) ship within 48 hours. We also offer remote commissioning and annual maintenance contracts.