Kaolin clay, also known as china clay, is a soft white mineral used in various industries like ceramics, paper, paint, and cosmetics. Crushing kaolin clay requires specialized equipment to achieve the desired particle size while maintaining its purity. Here are the key crushing and grinding equipment used for kaolin processing:
1. Primary Crushing Equipment
– Jaw Crusher: Used for coarse crushing of raw kaolin to reduce large chunks into smaller pieces (typically 5–10 mm).
– Hammer Crusher: Suitable for softer materials like kaolin, breaking it down into smaller fragments.
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2. Secondary Crushing & Grinding Equipment
– Impact Crusher: Further reduces kaolin particles to medium-fine sizes.
– Cone Crusher: Provides more precise crushing for harder kaolin variants.
– Raymond Mill (Roller Mill): A common choice for grinding kaolin into fine powder (80–400 mesh).
– Ball Mill: Used for wet or dry grinding to achieve ultra-fine particles (<45 microns).
– Vertical Roller Mill (VRM): Energy-efficient grinding for fine and ultra-fine kaolin powder.
3. Ultra-Fine Grinding & Classification
– Jet Mill (Fluid Energy Mill): Produces superfine kaolin powder (D97 < 10 microns) using high-speed air streams.
– Attrition Mill: For high-.jpg)
ity ultrafine grinding.
– Air Classifier: Separates particles by size after milling.
4. Auxiliary Equipment
– Vibrating Feeder & Screener: Ensures uniform feeding and removes oversized particles.
– Dust Collector (Bag Filter): Controls dust during crushing and grinding.
– Magnetic Separator: Removes iron impurities from kaolin.
Processing Considerations
– Kaolin is soft and abrasive; equipment should have wear-resistant linings.
– Dry vs. wet processing: Wet methods (hydrocyclones, sedimentation) are used for higher purity.
– Some applications require calcined kaolin, which involves heating after crushing.
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