The classifier in a raw grinding mill (typically used in cement or mineral processing) is a critical component that separates fine particles from coarse ones, ensuring optimal grinding efficiency. The materials used for the classifier must withstand abrasion, high temperatures, and corrosion. Common materials include:
1. Classifier Blades/Vanes:
– High-Chromium Cast Iron (HCCI): Offers excellent wear resistance due to high chromium content (15-30%).
– Ni-Hard Cast Iron: Contains nickel and chromium for improved hardness and abrasion resistance.
– Hardened Steel Alloys (e.g., AR400/AR500): Used in less severe conditions where impact resistance is needed.
– Ceramic or Tungsten Carbide Coatings: Applied to enhance wear resistance further.
2. Classifier Housing/Structure:
– Mild Steel with Wear Liners: Often lined with abrasion-resistant plates (e.g., Mn steel or ceramic tiles).
– Stainless Steel (e.g., SS304/SS316): Used in corrosive environments.
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3. Rotor Shaft & Bearings:
– Alloy Steel (e.g., 42CrMo4): High strengt.jpg)
nd fatigue resistance.
– Stainless Steel (for corrosive conditions).
4. Sealing Components:
– Rubber or Polyurethane Seals: For dust prevention.
– Graphite or PTFE Seals: For high-temperature applications.
Key Considerations:
– Abrasion Resistance: Essential due to constant particle impact.
– Temperature Stability: Raw mills often operate at elevated temperatures.
– Corrosion Resistance: Needed if processing moist or chemically active materials.
For highly abrasive applications, advanced materials like ceramic composites or tungsten carbide may be used in critical areas. The choice depends on operational conditions, cost, and maintenance requirements.
Would you like recommendations for a specific type of raw mill classifier?
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