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CRGM Series

Ultrafine Grinding Mill for 300-3000 mesh project targets

Name: CRGM Series Ultrafine Grinding Mill
Brand: CRONUS

Multi-stage ring-roller grinding, controlled recirculation and turbine classification for high-value fine mineral powder.

CRGM overview

Dry ultrafine grinding with a sharp, controllable classification cut

CRGM is developed for brittle materials generally below Mohs hardness 6. The complete standard circuit includes the main unit, classifier, double cyclone, pulse bag filter, blower, motor, piping and muffler.

5-74 μmPublished range

0.2-12 t/hCatalog capacity

≤20 mmFeed size

4 modelsCRGM60-125

Request CRGM Selection Catalog

Working principle

Four coordinated stages from feed to qualified ultrafine powder

01
Controlled feedPre-crushed material enters the main mill and is distributed across the rotating grinding zones.
02
Layered ring-roller grindingMultiple turnplates drive rollers along fixed tracks, applying repeated compression and shearing.
03
Air classificationHigh-pressure airflow conveys powder to the turbine classifier; coarse particles return for further grinding.
04
Product collectionQualified fines pass through cyclone and pulse collection while the designed air circuit controls dust.

CRONUS

Performance advantages

Designed for fine cut accuracy, recirculation and clean collection

Energy-efficient route

The catalog reports higher output and 30% lower energy consumption than the referenced jet-mill comparison under suitable conditions.

Durable wear system

Specially selected forged roller and ring materials improve service life.

Accurate classifier

The vertical turbine classifier supports a sharp cut and reduces coarse-particle carryover.

Flexible control

Variable-frequency adjustment coordinates classifier speed, airflow and feed.

Noise treatment

Sound insulation and muffler design limit operating noise transmission.

Closed collection

Cyclone and pulse filtration recover product while supporting a cleaner plant.

Technical parameters

Published CRGM model specifications

Actual capacity varies with material properties and target distribution.

Model	Ring diameter	Layers	Rollers	Feed	Finished size	Capacity	Total power
CRGM60	600 mm	3	12	≤20 mm	5-74 μm / 200-2500 mesh	0.2-3 t/h	101 kW
CRGM80	800 mm	3	21	≤20 mm	5-74 μm / 200-2500 mesh	0.5-4.5 t/h	143 kW
CRGM100	1000 mm	4	28	≤20 mm	7-74 μm / 200-2000 mesh	1.8-5 t/h	244 kW
CRGM125	1250 mm	4	32	≤20 mm	7-74 μm / 200-2000 mesh	1.5-12 t/h	401 kW

The 300-3000 mesh window is a project target. Standard catalog ranges are shown above; finer configurations require sample testing.

Mill selection comparison

Why ultrafine applications require CRGM rather than a Raymond mill

The correct route is determined by the finished powder specification, not by mill size alone.

CRGM SERIES

Ultrafine Grinding Mill

Published fineness: 5-74 μm, approximately 200-2500 mesh
Typical project target: 300-3000 mesh; the finest targets require sample testing
Published capacity: 0.2-12 t/h across CRGM60-125
Representative power: 101-401 kW total installed power
Maximum feed: ≤20 mm
Grinding route: Multi-layer ring-roller compression and shearing
Classification: Vertical turbine classifier for a sharp ultrafine cut
Best-fit applications: Coatings, masterbatch, paper, rubber, engineered plastics and functional fillers

CRRM SERIES

Raymond Mill

Published fineness: 80-400 or 80-325 mesh on representative models
Typical project target: 40-400 mesh
Published capacity: 1-28 t/h across the CRRM platform
Representative power: 125-715 kW for listed main unit, classifier and blower combinations
Maximum feed: 20-35 mm, model dependent
Grinding route: Pendulum rollers compress material against the ring
Classification: Air classification optimized for conventional powder
Best-fit applications: Building materials, desulfurization, metallurgy, ceramics and general mineral powder

When CRGM is technically necessaryProducts near 5-20 μm, low coarse-particle residue and controlled D97 affect dispersion, surface finish, reinforcement and filler performance. A conventional Raymond circuit normally cannot provide the same ultrafine cut precision.

Confirm Your D97 Target

Applications

Fine mineral powder for performance-critical industries

CRGM is preferred when coatings, masterbatch, paper, rubber, engineered plastics, cosmetics or fine fillers require a low coarse-particle residue and controlled D97.

Calcite

Coatings, plastic, rubber, paper and artificial marble fillers.

Limestone

Building materials, desulfurization and general mineral filler.

Dolomite

Glass, ceramics, metallurgy and construction fillers.

Barite

Drilling, high-density filler and coating applications.

Kaolin

Ceramics, paper coating, rubber and paint.

Talc

Plastic, coating, ceramic and cosmetic fillers.

Gypsum

Wallboard, plaster, cement and industrial powder.

Bentonite

Foundry, drilling, pelletizing and absorbent products.

Why not use a Raymond mill?Products near 5-20 microns, tight top-cut residue and functional surface requirements need more classification precision than a conventional Raymond circuit normally provides.

Discuss Your Product

Cases and customer sites

CRGM equipment from assembly to production

CUSTOMER SITE

Complete ultrafine production circuit

Main unit, classifier, cyclone, pulse collection and controlled feeding in a real plant.

INSTALLATION

CRGM line installation and commissioning

Equipment positioning, ducts, collection and controls coordinated around the site layout.

Customer visits

Customers reviewing CRGM structures, wear systems and project scope

Factory visits let project teams inspect machining, assembly, wear parts, test capability and plant references before finalizing equipment scope.

Indian customer inspecting grinding mill equipment in the CRONUS factory — **Equipment inspection**International customer reviewing mill structure and manufacturing details.

Indian customers visiting the CRONUS machining workshop — **Workshop tour**Machining capability, large components and quality control discussion.

Egyptian customer technical meeting with CRONUS — **Technical meeting**Application data, process scope and delivery requirements reviewed face to face.

CRONUS sales engineer meeting a grinding mill customer at Canton Fair — **Global exhibitions**Direct consultation on mineral grinding projects and international service.

Frequently asked questions

CRGM ultrafine grinding mill FAQ

Use these answers as an initial engineering framework. Final selection still requires raw material and finished-product data.

CRONUS engineers reviewing grinding mill drawings

1. What is the main difference between CRGM and a Raymond mill?

CRGM uses multi-layer ring-roller grinding and a turbine classifier for ultrafine powder. A Raymond mill uses pendulum rollers and is optimized for conventional mineral powder with higher throughput.

2. Can CRGM produce 3000-mesh powder?

It can be treated as a project target for suitable materials and configurations. The supplied standard catalog lists 5-74 microns, approximately 200-2500 mesh, so 3000 mesh requires sample testing and classifier confirmation.

3. What materials are suitable for CRGM?

Typical materials include calcite, marble, dolomite, barite, talc, gypsum, petroleum coke, brucite, kaolin, bentonite and other brittle materials generally below Mohs hardness 6.

4. How is CRGM fineness adjusted?

Classifier speed, process airflow and feed rate are coordinated through variable-frequency control. Product changeovers may also require cleaning and operating parameter stabilization.

5. What does D97 ≤ 5 microns mean?

Under the agreed particle-size test method, 97% of measured particles are at or below 5 microns. It is more precise than describing the product only by mesh.

6. How is CRGM capacity confirmed?

Capacity depends on mineral grindability, feed size, moisture, target D97, top-cut residue and circulation load. Catalog values are references and sample testing is recommended.

7. Does the system include dust collection?

The standard CRGM circuit includes cyclone separation, pulse bag filtration, a blower, piping and a muffler, with project-specific discharge and enclosure options.

8. Which parts normally wear?

Grinding rollers, rings, classifier components, pins, filter bags and seals are typical service items. Wear life depends on abrasiveness and operating hours.

9. Can one CRGM line make several grades?

Yes, within the selected classifier and operating range. Very different grades require controlled changeovers and may benefit from separate product collection.

10. What data is required for a quotation?

Provide material name, chemistry, hardness, moisture, feed size, target D97 or mesh, output, operating hours, voltage and project location.

Confirm CRGM output with your material data

Send hardness, moisture, feed size, target D97 and hourly output.

Request CRGM Proposal