1. What is a Raymond mill?
The Raymond mill, also called Raymond roller mill, combines grinding, classifying, and if necessary, drying, in one machine to produce precisely sized powders to meet exact production specifications. It is an efficient fine grinding machine for large-scale powder production.
2. Wide applications of Raymond mill
Raymond mill is widely used in chemical fertilizer, chemical product, and mineral industries to grind non-combustible and non-explosive non-metallic materials with Mohs hardness below 9.3 and humidity below 6%.
It is an excellent grinding machine for barite, calcite, calcium carbonate, potassium, feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass, etc.
3. Raymond mill parts
Raymond mill is mainly composed of Roller, Ring, Shovel, Shovel base, Bearing, Roller bushing, Spring for roller, Roller hanger, Reducer, Main shaft, Bevel gear & pinion, Classifier, Blower, Locking nut, Roller assembly, Snail shell, Motor, Elevator, Chain, Vibrating feeder, Crusher, etc.
Important parts and their functions
Auxiliary speed reducer
It is mainly used to reduce the speed of the rotating motor.
Grinding roller and grinding ring
The materials are ground between the rollers and the grinding ring. As the wearing parts of Raymond mills, they are all made of excellent wear-resistant materials to prolong the service life of the equipment.
Blower
A blower can blow the powder towards the upper classifier for classifying.
Classifier
The classifier is for classifying the ground powders. The speed of the classifier determines the fineness of the finished product.
Raymond mill plant working principle
Step 1Raw materials are crushed into specified particle size by a jaw crusher, lift to the hopper by a bucket elevator, and then sent into the grinding chamber by a feeding machine quantitatively.
Step 2Rotating shovels scoop up raw materials and project them between the rollers and the ring where the grinding takes place.
Step 3The pulverized powder is blown to the classifier by the blower airflow for classifying. The oversized particles fall into the grinding chamber for regrinding. Qualified powders flow into cyclone collector through the classifier and are collected as end products.
Step 4To ensure that the Raymond mill works under negative pressure, the increased airflow enters the pulse dust collector through the pipe and is discharged into the atmosphere after purification. The dust-free operation in the workshop is realized by the pulse collector.
5. Features of Ftmmachinery Raymond mill
1. Large output and high grinding efficiency
Outputs of 8 to176 tons per shift (8 hours). The finished powder is uniform in fineness, and the passing rate is as high as 99%.
2. Ability to produce powders of different particle sizes
Different uses of powder require different particle sizes. Therefore, the fineness of the Raymond mill can be adjusted arbitrarily between 0.173mm and 0.044mm. The achievable upper particle size is 800 mesh.
3. Low energy consumption
The Raymond pendulum mill achieves high requirements for grain size distribution easily and extremely energy efficiently, even in case of the highest demands regarding the fineness to be achieved.
4. Extremely robust and durable design
Less vibration due to integral gearbox increasing the mass of the mill and special designed anti-vibration device. Vibration reduction avoids cracking or damage to the frame and return box from long-term vibration and fatigue.
The important parts are made of high-quality steel, and the wearing parts are made of excellent wear-resistant materials to improve wear resistance.
5. Environmental protection
The good sealing performance of the equipment and the full-pulse dust collector ensure that the dust removal rate can reach 99%.
6. Automatic control
The electrical system adopts centralized control, and the grinding workshop can basically achieve unmanned efforts.
Customer cases
Gypsum grinding plant in India
- 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
"I am really satisfied with the gypsum powder produced by the Ftmmachinery Raymond mill. It’s white with even particle size. I'm a gypsum powder supplier and committed to selling high-quality products to my clients, so I have a high requirement for fine powder.”
10-15 TPH gypsum powder grinding process Yes! I'm interested
Coal slag grinding plant 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
"Concrete mixed with coal slag has good water retention, plasticity, less bleeding, which means only high-quality product can bring me more money. This Raymond grinding line did bring me considerable profit.”
300 kiloton/annually coal slag grinding plant Yes! I'm interested
Quartz stone grinding plant in 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
"With the same fineness and output of all quartz stone grinding machines, Raymond mill can save nearly half of the electricity, and the low energy consumption greatly saves electricity costs.”
300 t/h quartz stone grinding solution Yes! I'm interested
Parameter
| Parameter Model |
Raymond mill62 | High strength66 | High strength76 | High strength87 | High strength92 | High strength93 | High strength97 | Raymond mill4119 | Raymond mill4525 |
| Feeding size（mm） |
<15 | <15 | <20 | <25 | <25 | <25 | <25 | ≤25 | ≤30 |
| Size of finished product（mm） |
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 fineness(t) |
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 shart（r/min） |
274 | 190 | 170 | 161 | 148 | 140 | 130 | 105 | 82 |
| Diameter of pulverizing ring（mm） |
525 | 725 | 850 | 907.5 | 973 | 1006 | 1050 | 1400 | 1770 |
| Diameter of pulverizing ring（mm） |
150 | 210 | 250 | 270 | 300 | 300 | 310 | 410 | 450 |
| Height of pulverizing roller（mm） |
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 |
|
Parameter Model |
Feeding size（mm） |
Size of finished product（mm） |
| 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 |
