Feed
Prepared mineral enters through a sealed feeder.
CRGM Ultrafine
Ring Roller Mill
Controlled 5–45 μm mineral powder production with multi-stage rolling, dynamic air classification and a compact closed-circuit system.
- 5–45 μm
- Typical D97 range
- 0.5–12 t/h
- Series capacity range*
- 3 models
- CRGM1000–3000
*Capacity varies with material, feed size and target fineness.
CRGM1000CRGM2000CRGM3000
1973Manufacturing heritage
50+ yearsPowder engineering experience
ISO & CECertified management and equipment
Factory directMachining, casting and support
01 / Product overview
Fine powder, without an overcomplicated process.
The CRGM is a dry ultrafine grinding system designed for brittle, non-flammable mineral feed. Material is repeatedly compressed and sheared between the grinding rollers and rings, then carried upward by air to a dynamic classifier.
Qualified powder passes to the pulse dust collector. Oversize particles return to the grinding zone automatically, creating a stable closed circuit with no separate screening stage.
01
Metered feeding
A variable-speed feeder introduces prepared material at a consistent rate, helping the mill maintain a stable load and particle-size distribution.
- Recommended feed is dry and uniformly sized
- Magnetic separation can protect the grinding zone
- Feed rate links to mill current and pressure
02 / Technology
One continuous, closed-loop grinding circuit.
From feed control to final collection, each component has a defined job. The result is a compact line with adjustable fineness and low fugitive dust.
Press & shear
Multiple roller layers generate high-frequency crushing and attrition.
Classify
Rotor speed sets the cut point; coarse particles return internally.
Collect
Qualified powder is separated in a high-efficiency pulse collector.
Integrated system designMill, classifier, collector, fan and controls engineered as one process.
Precise classification
Variable-speed dynamic classification provides a controlled top size and allows fineness adjustment without changing screens.
High grinding frequency
Multiple roller-and-ring contacts increase the probability of particle breakage within a compact chamber.
Clean negative-pressure operation
Sealed air conveying and pulse filtration reduce dust leakage and simplify material transfer.
Wear-focused construction
Replaceable high-wear components and accessible modules keep routine maintenance predictable.
Automation-ready
Centralized electrical control supports interlocks, load monitoring and optional PLC-based production recipes.
03 / Model selection
Scale the same process to your production target.
Choose a starting platform below. Final sizing is confirmed after reviewing grindability, bulk density, moisture, feed size and required particle distribution.
CRGM1000
Flexible output for focused product lines.
Suited to specialty mineral powders, market development and plants that prioritize recipe flexibility over maximum throughput.
0.5–2.0 t/hTypical capacity
≤ 10 mmRecommended feed
5–45 μmTypical D97
Technical selection data
Typical engineering ranges, not guaranteed values. Final data is confirmed in the technical proposal.
| Parameter | CRGM1000 | CRGM2000 | CRGM3000 |
|---|---|---|---|
| Typical capacity | 0.5–2.0 t/h | 2–6 t/h | 4–12 t/h |
| Typical product fineness | D97 5–45 μm | D97 5–45 μm | D97 5–45 μm |
| Recommended feed size | ≤ 10 mm | ≤ 15 mm | ≤ 20 mm |
| Recommended feed moisture | ≤ 3% | ≤ 3% | ≤ 3% |
| Main mill motor range | 75–90 kW | 185–250 kW | 315–400 kW |
| Classifier motor range | 15–22 kW | 30–45 kW | 55–75 kW |
| Typical roller count* | 18–24 | 24–32 | 32–40 |
| Approx. installed power* | 115–160 kW | 280–380 kW | 480–650 kW |
| Suggested duty | Specialty / pilot | General production | High-volume line |
*Configuration-dependent. Capacity references limestone/calcium carbonate type feed at moderate fineness; harder or finer duties reduce throughput. Ask Cronus for a material-specific selection.
04 / Applications
One platform. Many mineral powder markets.
CRGM systems are selected for non-metallic mineral processing where tight top-size control, clean handling and consistent powder quality matter.
Plastics & masterbatchPaints & coatingsPaper fillersRubber compoundsBuilding materialsCeramicsAgricultureEnvironmental treatment
Limestone
Construction, desulfurization, fillers
Calcium carbonate
Plastics, paper, coatings, sealants
Dolomite
Glass, ceramics, soil treatment
Talc
Polymers, coatings, ceramics
Barite
Drilling, coatings, dense fillers
Kaolin
Paper, ceramics, rubber
Gypsum
Boards, plaster, cement
Bentonite
Foundry, drilling, absorbents
Material check
CRGM is intended for dry, brittle, non-explosive mineral feed. Fibrous, sticky, heat-sensitive, combustible or high-moisture materials require specific evaluation and may need pre-drying, inerting or a different process.
05 / Installed systems
Built around real production conditions.
Workshop assembly, installed lines and field footage from Cronus projects.
Factory acceptance
Multi-line CRGM system assembly
Parallel modules provide flexible capacity and make staged maintenance possible without redesigning the complete powder circuit.
Field video 01
Grinding system in operation
Field video 02
Installed production line
06 / Process comparison
When a ring roller mill is the better fit.
A Raymond mill remains a sound choice for many coarse powder duties. CRGM becomes more attractive when the specification moves finer and particle-size control becomes more demanding.
| Decision factor | CRGM ring roller mill | Conventional Raymond mill |
|---|---|---|
| Best-fit product range | Ultrafine powder, typically D97 5–45 μm | Fine to coarse powder, commonly 45 μm and above |
| Size control | Dynamic classifier with adjustable cut point | Classifier control; generally broader at ultrafine targets |
| Grinding action | Multi-stage rolling, pressing and shearing | Pendulum rollers against a grinding ring |
| Ultrafine efficiency | Designed for repeated high-frequency breakage | Throughput falls more sharply as fineness increases |
| System arrangement | Compact closed circuit with integrated collection | Mature, simple layout for general-purpose grinding |
| Choose when | Premium fine products, tight top size, multiple fine grades | Lower capital priority and a coarser finished product |
Not sure which process fits?Share your feed analysis, target PSD and annual operating hours. Our engineers will compare the circuits on product quality, energy, wear and total operating cost.
Request a process review 07 / Wear parts
Original parts, made close to the machine.
Cronus supports the full service life with OEM drawings, a dedicated casting supply chain and fit-controlled replacement parts.
OEM dimensional controlIn-house casting capabilityMaterial traceabilityPractical factory-direct pricing
Grinding rollers
Wear-resistant alloy options matched to mineral abrasiveness.
Grinding rings
Controlled hardness and mating geometry for stable grinding.
Main shaft
Machined and inspected against original assembly drawings.
Turntable
Balanced rotating assembly for reliable long-term operation.
Classifier rotor
Precision geometry protects the product cut point.
Filter elements
Correct media selection for temperature and powder behavior.
Electrical controls
Documented components and practical replacement support.
Drive components
Matched reducers, couplings and bearings for the duty.
08 / About Cronus
Shanghai service. Guilin manufacturing depth.
Cronus is a subsidiary of Guilin Mining Machinery Co., Ltd. The manufacturing organization was established in 1973 and has accumulated more than five decades of experience in powder grinding equipment.
From casting and machining to assembly, electrical integration and field service, the group keeps the critical stages of equipment delivery under coordinated control. Cronus connects that industrial base with international project communication and export support from Shanghai.
High-tech enterpriseCE certificationISO management systemsInvention & utility patentsSpecialized manufacturing enterpriseEnterprise technology center
09 / Lifecycle service
Support that starts before the purchase order.
Good mill performance begins with a complete process brief. Our service path keeps technical decisions visible from sample review through commissioning.
- 01
Material review
Feed chemistry, hardness, moisture, bulk density and target particle distribution.
- 02
Process engineering
Model selection, flow diagram, utilities, dust control and layout coordination.
- 03
Manufacturing & inspection
Documented fabrication, assembly checks and factory acceptance preparation.
- 04
Installation guidance
Foundation information, erection guidance, commissioning and operator training.
- 05
Production support
Remote troubleshooting, process optimization and planned spare-part supply.
10 / FAQ
Technical questions, answered clearly.
These answers cover early-stage selection. Your formal proposal will define the material-specific process and performance basis.
Ask an engineerWhat product fineness can a CRGM mill produce?
The normal selection envelope is approximately D97 5–45 μm. The actual cut point and distribution depend on feed properties, classifier speed, airflow and circulating load.
Which materials are suitable for CRGM grinding?
Typical duties include calcium carbonate, limestone, dolomite, barite, talc, kaolin, gypsum, bentonite and wollastonite. The feed should normally be dry, brittle and non-explosive.
How do I choose between CRGM1000, CRGM2000 and CRGM3000?
Selection starts with required throughput at the target fineness, then checks grindability, feed size, moisture and operating hours. CRGM1000 suits smaller or specialty lines, CRGM2000 covers mainstream production, and CRGM3000 serves higher-volume plants.
How is CRGM different from a Raymond mill?
CRGM is optimized for ultrafine duty through multi-stage rolling and high-efficiency classification. Raymond mills remain effective for coarser products, but their capacity and efficiency generally reduce more sharply at very fine targets.
Is the stated capacity guaranteed for every material?
No. Published ranges are selection references. Capacity changes with hardness, feed PSD, moisture, bulk density and final fineness. A technical proposal defines the guaranteed basis for your material.
Can the fineness be adjusted during production?
Yes. Product fineness is primarily adjusted through classifier speed and airflow, within the configured process window. Feed rate and mill load must remain balanced when changing grades.
Does the system need a separate screen?
Normally no. The dynamic air classifier separates qualified powder continuously and returns coarse particles to the grinding chamber.
How is dust controlled?
The line works under negative pressure. Enclosed ducts transfer powder to a pulse dust collector, reducing fugitive dust when the system is correctly installed and maintained.
What are the main wear parts?
Common items include grinding rollers, grinding rings, pins, liners, classifier components, filter bags, seals and drive-related consumables. Wear rate depends strongly on mineral abrasiveness and operating practice.
Can Cronus test my raw material?
Yes. A representative sample can be evaluated for grindability and process behavior. Include the target particle-size distribution, required capacity and intended application with your inquiry.
What utilities are required?
The core line requires electrical power and compressed air for pulse cleaning and controls. Depending on the feed, a dryer, cooling arrangement, magnetic separator or special dust protection may also be required.
What installation and commissioning support is available?
Cronus can provide foundation and layout information, remote or on-site installation guidance, commissioning support, operator training and planned spare-part recommendations, subject to the project contract.
How should I prepare an inquiry?
Provide material name and chemical analysis, feed size, moisture, Mohs hardness if known, desired D97 or mesh, required output, operating hours, site voltage and available plant space.
Start your selection
Tell us what your powder needs to do.
Send the six details below and our engineering team can prepare a practical model recommendation and process outline.
Phone / WhatsApp+86 199 2122 1418
Emailsales@shcronus.com
Shanghai officeRoom 801, Building 2, Shanghai Zhicheng, No. 8666 Hunan Road, Pudong New Area, Shanghai, China