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Raymond Mill

Raymond Mill

Applied materials: various non-flammable and explosive minerals such as gypsum, talc, calcite, limestone, marble, potash feldspar, barite, dolomite, granite, kaolin, bentonite, medical stone, iron ore, etc.

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Model: Raymond mill 62

Main Motor: 7.5 kw

Max.feeding size

Max.feeding size: <15 mm

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Model: High strength 92

Main Motor: 30 kw

Max.feeding size

Max.feeding size: <25 mm

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Model: Raymond mill 4525

Main Motor: 132 kw

Max.feeding size

Max.feeding size: <30 mm

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What is a Raymond mill?

Raymond mill is a widely used mill machine for grinding coarse material into powder with different granularity. Its applications suit for many areas such as mining industry, gravel and quarry industry, chemical industry and construction waste recycling industry, and it can grind over 280 materials with Moh's hardness below 9.3 and humidity below 6%.

what materals can be processed by raymond mill

what matrials can be processed by raymond mill

The structures and important parts

The structures design of Raymond grinding mill

Raymond mill actually can be divided into two types of machines processing different materials. One is called Raymond vertical mill and the other is Raymond roller mill. The difference between them is that vertical grinding mill belongs to high-speed air swept swing hammer mill while the other belongs to air-swept vertical ring-roll mill.

The main structures:

The main body consists of a frame, an air inlet volute, scraper blade, star rack, a grinding roller, a grinding ring, air classifier, etc.

If you decide to purchase a raymond roller machine, please click: Get Latest Price

Important parts and their functions

Auxiliary speed reducer

It is mainly used to reduce the speed of the rotating motor.

Grinding roller (grinding ring)

There are two grinding rollers directly contacting with material for grinding process.

Draught fan

The function of the part is to below and discharge the fine powder


It is used to classy the ground powder, and greatly influences the final powder granularity.

Raymond mill plant working principle

prats of the raymond mill production line

low consumption and environmental protection

Step 1The jaw crusher crushes large pieces of material into smaller particles within the feed size of the Raymond roller mill. The crushed materials, after passing through the bucket elevator, are sent into the storage hopper and vibrating feeder for being evenly and continuously ground in the main crushing chamber.

Step 2The grinding roller constantly presses the grinding ring under the centrifugal force, which can grind the material scooped up by the scraper blade into powder.

Step 3Then the power through wind pipe enters the powder collector for separating. The desired final powder product will be discharged from the discharging port while there would be another grinding for the undsired powder until it meets standard.

Step 4During the discharging process, it will be accompanied by fine dust which will be collected by the dust collector.

raymond mill working principle

Raymond mill inside structures

Raymond mill's outstanding advantages

Small footprint

Raymond mill uses the design of the vertical structure with less occupied-place and a systematic working style. The whole process from coarse crushing, transportation, grinding to final packaging is an independent production system.

High pass rate

The final powder fitness is even with a 99% pass rate, which can't be realized by other grinding equipment.

Reliable operation

The transmission device adopts a sealed gearbox and belt wheel design with smooth transmission and reliable operation.

Better wear resistance

The important parts of Raymond mill are made of high-quality steel, the wearing parts are made of high-performance wear-resistant materials, and the complete machine is of better wear-resistance.

advantages of the raymond mill

Fote raymond mill can greatly improve efficiency

Automatic control

The electrical system adopts centralized control, and the grinding workshop can basically achieve unmanned efforts.

Low dust pollution and low noise

Because of the improvement of working principle, Raymond mill has lower noise and less pollution.

Uniform feeding

With the electric-magnetic vibrating feeder to convey the materials, the Raymond mill has the features of even feeding, small size, low weight, fuel and power saving, easy adjustment.

Why Fote Raymond mill is your best choice?

Upgrade important parts on the basis on traditional design

shockproof device design

According to the original shockproof capacity of the Raymond mill equipment and its surrounding shake parameters, Fote experts upgraded a new shockproof material. During the searching process, they made the device by means of dynamic analysis of diaphragm-designed structures and theory of structural dynamics. What’s more, it is a good solution to the problem of over-larger vibration only with a smaller power.

Host design

They adopt the integral base of the host which makes the machine structure solid, reliable and strong seismic resistant. The design perfectly avoids the cracking or damage of components caused by long-time vibration and fatigue of framework and air return box.

Upgrade on grinding roller

The grinding roller and its shaft can complement each other, which means that the roller cannot only revolve but rotating. The part is engineered to improve the machine’s efficiency and durability even under greater grinding force and higher operating speed.

Unique design of dust collector

A full pulse dust collector to collect the finished powder products, running under negative pressure without dust leakage, and more environmentally friendly.

raymond mill 3D video

how dose Raymond mill roller work

The design of whole system

In the design of the whole system, Fote has changed the traditional two-stage collection to four-stage collection. The primary and secondary collections are collected by circulating negative pressure and there is no dust leakage. The third and fourth-level collections use controllable-overflow dry and wet collection to prevent dust overflow.

Over 35 years of research and manufacturing experience

Fote Heavy Machinery, as one of the leading manufacturers of grinding equipment for more than 35 years produces and sales many kinds of Raymond mills and components for a variety of industries including cement, concrete, mineral aggregates and power generation all over the world.

Our Raymond grinding mills and related components can be inspected in our 35 thousand-square-foot facility located in Zhengzhou, Henan Province, China. Our equipment is finished and ready to ship whether you are expanding capacity or in an unexpected emergency situation.

Besides, compared to other manufacturers, Fote can provide the lowest price due to direct sale to our customers without distributor.

Successful customers' cases

Raymond mill processing gypsum in India

Raymond mill is often used to grind a variety of non-metallic ores into superfine powders, especially for processing gypsum.

India is a country with abundant gypsum resources, India is important to the gypsum reserves and production. Many Indian customers found us and requested us for grinding production projects, especially for grinding gypsum powder.

In March 2019, an Indian customer contacted us to process ultra-fine gypsum powder, hoping to use it in production as soon as possible. After an on-the-spot investigation, our engineer introduced him with a gypsum production line that integrated feeding, crushing, grinding and dust collection.

The project of the specific gypsum production line:

The following is the specific production line:

  • Output: 10-15 t/h
  • Finished particle size: 80 mesh-340 mesh (0.173 mm-0.044 mm)
  • Raw material: Gypsum
  • Raw material hardness: soft
  • Feeding size: ≤100 mm
  • Production line type: fixed
  • Purchasing equipment: PE-250 × 400 jaw crusher, 4525 Raymond mill, vibrating screen, conveyor, dust collector

Fote Raymond mill worksite in India

gypsum with white color and even particle size

customer feedback

"I really satisfied with the gypsum powder produced by Fote Raymond mill. It’s white with even particle size. I'm a gypsum powder supplier, and committed to selling the high-quality product to my clients, so I have really high requirement on fine powder.”

10-15 TPH gypsum powder grinding process Yes! I'm interested

Coal slag grinding in Thailand

  • Output: 300 kiloton/annually
  • Finished particle size: 360 mesh( 0.04 mm)
  • Raw material: ore slag
  • Raw material hardness: soft
  • Feeding size: ≤100 mm
  • Production line type: fixed
  • Purchasing equipment: PE-250 × 400 jaw crusher, 4525 Raymond mill, vibrating screen, conveyor, dust collector

coal raymond mill work in Thailand

low consumption and environmental protection

customer feedback

"Concrete mixed with coal slag has good water retention, plasticity, less bleeding, which means only high-quality product can bring me more money, and this Raymond grinding line did make me get considerable profit.”

300 kiloton/annually coal slag grinding plant Yes! I'm interested

Quartz stone grinding site on Pakistan

  • Output: 300 t/h
  • Finished particle size: 400 ( 0.038 mm)
  • Raw material: Quartz stone
  • Raw material hardness: hard
  • Feeding size: ≤25 mm
  • Production line type: fixed
  • Purchasing equipment: CJ 96jaw crusher, 4119 Raymond mill, vibrating screen, conveyor, dust collector

Raymond mill in Pakistan

raliable operation and smooth running

customer feedback

"When the fineness and output of quartz stone are the same to all machines, using Raymond mill can save nearly half of the power and increase the grinding output by about twice, which is amazing.”

300 t/h quartz stone grinding solution Yes! I'm interested

What are the similarities and differences between Raymond mill and ball mill?

For the mineral processing, the most common grinding machines are Raymond mill and ball mill. So, what are the similarities and differences between the two?


They are both the main equipment for grinding powder.

Both can be used for dry processing.

Both can be used for grinding non-metallic minerals.

The differences between Raymond and ball mill

the differences between raymond mill and ball mill

The differences between Raymond and ball mill

Processing different materials

Raymond mill is suitable for processing non-metallic materials that are not too hard, such as limestone, gypsum, calcium carbonate; ball mills can process metal materials and hard materials such as potassium feldspar, quartz, metal ores, etc.

Processing method

Raymond mill can only be used for dry grinding, which has a requirement of the material on the humidity; the ball mill can be used for wet grinding, so there is no limit to the materials on the humidity.

Different Output

The maximum output of Raymond mill is only 20-30 tons per hour, while the output of ball mill is between 0.65 tons and 615 tons per hour.

Discharging granularity

Raymond mill has a uniform particle size and does not need other equipment for screening; ball mill has an uneven discharge, so the finished powder needs to be sieved by powder separator.

Grinding fineness

Raymond mill can process a finer powder and produce even product with the fineness 800 mesh while the ball mill can only reach 400 mesh.

Matters need attention when using a Raymond mill

correct ways to maintain raymond mill

4 points to notice when using a Raymond mill

  1. 1During the working process, Raymond mill should be supervised by professionals, and the operators should be trained systematically before production operations. And Raymond mill should work under its maximum load in grinding.
  2. 2According to the feeding characteristics, adjust the discharge control of the machine to meet the production requirements before starting the machine.
  3. 3Timely maintenance. The machine should be inspected and maintained regularly to ensure that all parts of the machine work normally.
  4. 4If the machine makes abnormal noise while working or the load of the machine suddenly increases, stop and check immediately to eliminate the fault to avoid the secondary damage. Before turning on the machine again, the residual material inside the mill must be taken out to avoid excessive current affecting startup.
  5. 5Shutdown sequentially. When the grinding is finished, stop feeding and let the main engine continue to run firstly. Next, stop the host engine and the analyzer motor after the material in the host is completely discharged. Finally, stop the fan after the fan blows away the powder remaining in the host.


Raymond mill62 High strength66 High strength76 High strength87 High strength92 High strength93 High strength97 Raymond mill4119 Raymond mill4525
<15 <15 <20 <25 <25 <25 <25 ≤25 ≤30
Size of finished 
0.173-0.033 0.173-0.033 0.173-0.033 0.173-0.033 0.173-0.033 0.173-0.033 0.173-0.033 0.173-0.044 0.173-0.044
Shift output of
 different material 
0.6-9 1-20 1.5-25 2.8-33 3-36 3.5-40 4-52 8-78 16-176
Rotate speed 
of central 
274 190 170 161 148 140 130 105 82
Diameter of 
525 725 850 907.5 973 1006 1050 1400 1770
Diameter of 
150 210 250 270 300 300 310 410 450
Height of
100 150 150 150 160 160 170 190 250
Main Motor(kw) 7.5 15 18.5 22 30 30 37 75 132
Fan Motor 4-5.5 4-11 4-15 4-18.5 4-22 2-22 4-37 4-75 4-132
Analyzer Motor 6-1.1 6-2.2 6-2.2 6-2.2 6-2.2 6-3 4A-5.5 4B-7.5 4A-18.5



Size of finished 
High-strength97 <25 0.173-0.033
High-strength93 <25 0.173-0.033
High-strength92 <25 0.173-0.033
High-strength87 <25 0.173-0.033
High-strength76 <20 0.173-0.033
High-strength66 <15 0.173-0.033
High-strength62 <15 0.173-0.033
Raymond mill4119 ≤25 0.173-0.044
Raymond mill4525 ≤30 0.173-0.044



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