Kaolin Clay
Sturtevant Powderizer Air Classifier Mill
Ultra Fine Kaolin for Paper Coating and Filler or Paint grade:
Today’s global paper and paint market demands ultra fine Kaolin particle sizes to allow top quality paint and paper products to be produced at a reasonable cost. Along with calcium carbonate, Kaolin clay is still a much needed and valued commodity. A high value Kaolin needs partial distribution sizes of 90 to 95% - 2 micron in the 7 to 7.5 Hegman range to exist. Brightness values of 90 GE brightness are needed and opacity is a major consideration.
Using a Sturtevant Powderizer air classification mill both post calcining and pre-calcining is a key component to accomplish this.
The Process: Raw Kaolin is shredded, blunged and floated to remove debris then screened. Next iron is removed by magnetic separation, then the clay is dried. Next the Kaolin is processed by the Sturtevant Powderizer with the resultant product going next to the calciner. After calcining it is deagglomerated by an additional Sturtevant Powderizer mill. The result is a 7 to 7.5 Hegman 90 GE brightness Kaolin, suitable for high quality paper and paint today’s market demands and done with reasonable operation expenditure.
How the Powderizer air classifier mill works: A feed tube conveys material into the grinding chamber, where it is pulverized by impactors that are fixed to a high-speed rotor disk. The pulverized product is then swept upward in a column or air and exposed to an independently driven classifying wheel.
The air flow, created by the system exhaust fan, pulls the fine particles through the rotating classifier, while rejecting oversize particles. The oversize particles are thrown to the inside of the zone divider and directed back into the path of the impactors for additional reduction.
Particle size is easily adjusted by increasing or decreasing the classifier speed, without mill shutdown. Other system parameters are easily adjusted to allow for tight control of product size on a variety of materials, for grinding and classifying to less than 10 microns.
| Features: |
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• 5 to 300 hp, 50 to 15,000 lb/hr models available
• Classify and mill closed loop in a single unit
• Reversible Impact liner, Tungsten Carbide and other AR materials used for wear parts
• External access to bearing lubrication and/or temperature controlled oil lubrication options
• Bearings cartridge mounted
• Stainless steel models available standard
• Air swept mill runs cool
• Fully automated controls possible
• Easy open designs available |
| Benefits: |
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• Efficient Power Use
• Small foot print saves production space
• Final Particle size 5-100 micron with narrow Particle Size Distribution
• Long life period for wear parts
• Efficient bearing lubrication and maintenance
• Food processing allowed
• Heat sensitive materials can be processed
• User friendly operation
• Easy cleaning of mill internals |
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