Spiral Jet Mill | Compact Fine Grinding for Small Batches & Multi-Product Switching

Name: Spiral Jet Mill
Brand: Dewei Micronano

Three Dewei spiral jet mill systems with collection equipment — Equipment arrangement shown for reference. Final configuration depends on the material and agreed project requirements.

Evaluate a spiral jet milling route for your powder

The grinding chamber has no driven classifier wheel. Separation depends on flow within the chamber, so gas conditions and feeding affect the finished powder. Compare milling routes where a tightly controlled distribution is required.

Provide feed distribution, target fineness, and intended production duty.
Review gas supply, moisture, stickiness, and thermal sensitivity.
Agree cleaning access and acceptance criteria for product changes.

Working Principle

Process Flow

Compressed Air

Tangential Nozzles
High-Speed Injection

Flat Disc Chamber
Rotary Collision

Inertial Centrifugal
Self-Classification

Cyclone
Collection

Product Outlet

RECYCLE — Oversized particles continue circulating inside the chamber until target size is reached

Key Features

Compact Layout

Flat disc chamber, no rotating parts. Small footprint, easy to install in lab or production environments.

Fast Cleaning

Cleaning time depends on powder behavior, access, and required cleanliness. Agree a cleaning procedure for the intended material changes.

Low Temperature Rise

Gas expansion cooling keeps grinding zone temperature low, suitable for heat-sensitive and low-melting-point materials.

Minimal Metal Contamination

Primarily particle-to-particle self-impact. Wear-resistant contact materials available to meet purity requirements.

Simple Maintenance

No rotating parts means low day-to-day maintenance, suitable for lab and small-batch production environments.

Flexible Small-Batch Operation

Covers 10–10,000 kg/h range for small-batch multi-product operations with high process validation efficiency.

Applications by Industry

Industry	Typical Materials
Pharmaceutical & Chemical	Pharmaceutical intermediates, agrochemicals, dyes, pigments
Fine Chemicals	Specialty coatings, plastic additives, rubber fillers
Mineral Non-Metals	Calcium carbonate, talc, mica, fused silica
Food & Health	Spices, plant extracts, nutraceutical ingredients
New Materials R&D	Small-batch process validation and formulation testing for new materials

Model Specifications

The figures below are reference values for typical materials. Actual capacity varies with material density, hardness, and target particle size.

Model	Ref. Capacity	Product Size D97	Feed Size
DWC-5.5A	10–50 kg/h	10–200 µm	≤10 mm
DWC-15A	50–200 kg/h	10–200 µm	≤10 mm
DWC-30A	150–600 kg/h	10–200 µm	≤10 mm
DWC-55A	300–1500 kg/h	10–200 µm	≤10 mm
DWC-110A	500–3000 kg/h	10–200 µm	≤10 mm
DWC-220A	1000–10000 kg/h	10–200 µm	≤10 mm

Request a Selection Proposal

Tell us your material, batch size, and fineness requirements. We will recommend the right model and arrange a sample test.

Material name and properties (hardness, melting point, tendency to cake)
Target particle size: D97 or residue specification
Batch size and changeover frequency
Any GMP or cleanliness requirements

Contact Us

Submit material name, target fineness, and approximate batch size. We will reply with a selection recommendation.

Online Inquiry Arrange Sample Testing

Phone: +86-816-2680206

Frequently Asked Questions

What is the finest particle size the spiral jet mill can achieve?

Typically D97 10–200 µm. The finer the material (more brittle, softer), the finer the achievable particle size. Because there is no inline classifier wheel, the size ceiling is more influenced by air pressure and feed rate. If strict particle size control is needed, a fluidized bed jet mill should also be considered.

Can it run continuously, or is it batch-only?

The spiral jet mill supports continuous feeding, but is better suited for small-batch or intermittent production. For long continuous runs with larger capacity, fluidized bed jet mills generally offer better stability and ease of maintenance.

How long does a material changeover cleaning take?

There is no universal cleaning time. The previous material, contact surfaces, access, and cleanliness requirement all affect changeover. Agree and verify an appropriate cleaning procedure.

Can spiral mill trial data be used for fluidized bed mill selection?

It can serve as a reference, but the two mill types differ in classification mechanism — particle size distribution and capacity characteristics may vary. The recommended approach is to confirm process feasibility on the spiral mill, then run a scale-up trial on a fluidized bed mill before finalizing the selection.

Which operating conditions should be compared during trials?

Compare feed rate, gas conditions, particle-size distribution, recovery, and temperature where relevant. Use the same measurement method for each run so the results support a meaningful process choice.