A Mulino Raymond (detto anche Mulino a rulli Raymond oppure pendulum roller mill) is a fine grinding machine used to grind minerals into fine powder. Unlike a ball mill, which uses steel balls as grinding media, a Raymond mill uses grinding rollers pressing against a grinding ring to pulverize materials.

It is widely used for grinding:

• Calcare
• Calcite
• Dolomite
• Barite
• Gesso
• Marmo
• Bentonite
• Kaolin
• Talc
• Carbone

Main Components of a Mulino Raymond

1. Hopper

Funzione

• Stores raw materials
• Provides continuous feeding into the mill

2. Feeder

Funzione

• Feeds material at a constant rate
• Prevents overloading
• Ensures stable production

3. Grinding Ring

Funzione

• Fixed inside the grinding chamber
• Provides the surface against which the rollers grind the material

Material

• Acciaio ad alto tenore di manganese
• Wear-resistant alloy steel

4. Grinding Rollers

Funzione

• Rotate around the main shaft
• Press against the grinding ring
• Crush minerals by compression and friction

Usually a Raymond mill has 3–6 rollers.

5. Main Shaft

Funzione

The main shaft transmits power from the motor to the grinding rollers.

Motor
   ↓
Gearbox
   ↓
Main Shaft
   ↓
Grinding Rollers

6. Classifier

The classifier separates particles by size.

Funzione

The classifier separates:

• Fine powder → sent to collection
• Coarse particles → returned for further grinding

This enables closed-circuit grinding.

7. Blower (Air Fan)

Funzione

• Generates airflow
• Carries fine powder upward
• Assists classification
• Removes heat

8. Cyclone Collector

Funzione

Separates powder from the air stream.

Air + Powder
      ↓
 Cyclone
  ↙      ↘
Powder  Clean Air

9. Dust Collector

Funzione

• Collects remaining fine dust
• Prevents environmental pollution
• Improves powder recovery

How Does a Raymond Mill Work?

Fase 1: Alimentazione del materiale

Raw material enters through the hopper and feeder.

Raw Material
      ↓
    Hopper
      ↓
    Feeder

Step 2: Grinding Process

The motor rotates the main shaft.

The rollers rotate around the shaft and press against the grinding ring.

The material is ground between:

• Rulli di macinazione
• Grinding ring

Grinding occurs through:

• Compressione
• Attrito

Step 3: Airflow Lifts the Powder

The blower forces air upward through the grinding chamber.

Fine particles are lifted toward the classifier.

Step 4: Classification

The classifier separates particles by size.

Classifier
   ↓
Fine Powder
   ↓
Cyclone

Coarse Powder
     ↓
Return to Grinding

Step 5: Powder Collection

Fine powder enters the cyclone collector.

The finished product is discharged for:

• Packaging
• Storage
• Further processing

Complete Raymond Mill Process Flow

Raw Material
↓
Frantoio a mascelle
↓
Bucket Elevator
↓
Storage Hopper
↓
Feeder
↓
Mulino Raymond
↓
Classificatore
↓
Cyclone Collector
↓
Dust Collector
↓
Finished Powder