Vertical Powder Mixer, Doebritz Industrial Mixer, 1000L Capacity / ATEX Certified for Explosive Dust

Product Summary

Engineered for the most demanding bulk solids processing environments, the Doebritz Vertical Powder Mixer delivers high-efficiency blending of powders, granular materials, and flaky substances. With a working capacity from 500L to 5000L, this vertical mixer features a robust ATEX-certified explosion-proof design, minimal air leakage rate ≤0.5%, and a heavy-duty CNC-machined mixing screw. Ideal for pneumatic conveying integration and silo discharging.

Why Source Doebritz Vertical Powder Mixer

• Superior Airlock & Mixing Efficiency: Unique double-helix screw design combined with a drop-through rotary airlock reduces material degradation and ensures homogeneous blends in under 3-5 minutes.
• OEM Precision Manufacturing: All housings and rotors are CNC-machined from Cast Iron (GG25) or SS304/316L, guaranteeing micron-level tolerances for extended seal life and low cross-contamination.
• Global Compliance & Safety: Full ATEX Directive (2014/34/EU) certification for Zone 20/21 dust explosion hazards. Optional FDA-compliant coatings for food/pharma applications.
• Long Service Life: Outboard bearing arrangement and segmented stuffing-box seals minimize downtime. Typical MTBF exceeds 50,000 hours.
• Customizable Configurations: Choose from flanged discharge, quick-clean clamps, heating/cooling jackets, and variable frequency drives (VFD).

Housing & Rotor Engineering

The Doebritz Vertical Powder Mixer features a one-piece cast housing with integrated vent ports to prevent pressure build-up. The precision-ground rotor incorporates a proprietary 10-vane design with hardened tungsten carbide tips – resisting abrasive fly ash, cement, and carbon black. The vertical orientation allows gravity-fed material intake while the bottom-mounted mixing screw creates a convective lifting action. All mating surfaces undergo CNC honing to achieve a leak rate lower than industry standards (≤0.003 m³/h per bar pressure differential). Optional Teflon or Viton seals support continuous operation up to 250°C.

Technical Specifications

Doebritz provides certified factory test reports (FAT) for every unit. Below are standard parameters for the Vertical Powder Mixer series – custom engineering available upon request.

Specification	Detail
Body Material	Cast Iron GG25 / Stainless Steel 304/316L
Working Capacity	500L, 1000L, 2000L, 5000L (custom available)
Rotor Design	Double-helix screw + 10-vane rotor
Max Air Leakage	≤0.5% (0.003 m³/h at 1 bar differential)
Operating Temp	-20°C to +200°C (optional 250°C graphite packing)
ATEX Rating	II 2D Ex h IIIC T120°C (Zone 20/21)
Mixing Uniformity	CV ≤5% within 5 minutes
Drive Power	7.5 kW to 55 kW (VFD ready)
Seal Type	NBR/FKM/Teflon/graphite packing (OEM selectable)

Heavy-Duty Application Scenarios

Pneumatic Conveying Systems

Integrate the mixer directly into dilute or dense phase pneumatic lines. The low air leakage design preserves conveying pressure and prevents blowback, ensuring consistent powder flow from storage silos to process equipment.

Silo Discharging with Blending

Use as a pre-blender before bagging or filling. Mounted under a silo, the vertical mixer homogenizes lot variations from different deliveries – critical for cement, lime, and chemical compounds.

Dust Filter Collection Recycling

Connect downstream of a dust collector to mix recovered fines with virgin material. The ATEX-rated construction allows safe handling of combustible dusts like wood, grain, and polymer powders.

Frequently Asked Questions

What is the typical lead time for a Doebritz Vertical Powder Mixer?

Standard models (Cast Iron, 8-vane rotor) ship within 4-6 weeks. Custom stainless steel or ATEX-certified units require 8-10 weeks. Expedited options available for OEM stock orders.

Can you customize flange drilling to meet existing piping?

Yes. Doebritz accepts non-standard flange dimensions (ANSI, DIN, JIS). Provide your flange drawing, and we will CNC-machine the inlet/discharge ports accordingly without extra tooling fees.

Does the mixer include ATEX certification documents?

Absolutely. Every ATEX-specified unit ships with a declaration of conformity and certified drawing package (II 2D Ex h IIIC T120°C). We also support IECEx and UKCA requirements.

What is the maximum operating temperature?

With standard NBR seals: up to 80°C. With optional FKM (Viton) seals: up to 200°C continuous. For 250°C processes, request our high-temp graphite packing configuration.

Do you offer spare parts kits for this vertical powder mixer?

Yes. Doebritz provides comprehensive OEM spare parts (shaft seals, bearing assemblies, rotor tips). We maintain a global logistics network to ship emergency replacements within 48 hours.