Vertical Agitator Ball Mill
Alpine Agitator Ball Mill ATR
The vertical agitator mill consists of the cylindrical grinding chamber, which is filled with grinding beads with a diameter of a few millimeters and the material to be ground. The ratio between the grinding beads and the material to be ground is adjusted in such a way that the gaps between the grinding media are just filled with material to be ground. The grain size of the feed material should not exceed 100 µm because of the small grinding media. The agitator shaft, equipped with agitator arms, dips into the bed of grinding beads and material to be ground and is set in slow rotation by a motor via a gearbox.
- Agitator bead mill for dry grinding of superfine products with fineness up to approx. 80% < 2 µm and high specific surface
- Double-walled mill jacket for water cooling
- The mill works in circulation mode with Hosokawa Alpine Turboplex fine classifier
Characteristics
- Highest fineness, up to 90% < 2 µm with external sifting circuit
- High power density, approx. 200 kW/m³ fill. Compact design
- Iron-free processing, high degree of whiteness. Low peripheral speed, optimal use of energy, very reliable operation
- Low grinding bead wear, low operating costs
- Very long service life of the lining, low maintenance costs
possible applications
Typical areas of application for ATR mills are mineral fillers, glaze raw materials and non-mineral hard materials. Examples of materials: Limestone, quartz, zircon sand, talc, ceramic colors and frits, titanium dioxide, etc.
Minerals
- The mill is used for the fine grinding of mineral fillers or raw materials for glazing. Aluminum oxide grinding beads with a diameter of 4 mm are used in these applications. The mill is lined with alumina and the agitator arms are protected with alumina sleeves to minimize attrition and maximize filler whiteness. The end product is manufactured in an external classifying circuit with the Turboplex ATP wind classifier or the Turbo Twin TTC wind classifier. The coarse material is returned to the mill via a weighing container. The separated fines are continuously replaced with fresh material.
Starch damage
When baking rolls, a high water absorption capacity of the dough is advantageous. The water absorption of the starch, which is abundant in wheat flour, can be increased by about 20% if the flour is subjected to continuous stress in the ATR. The external inspection can be omitted in this process. In this application, the mill is filled with grinding beads made from special steel. The mill is not lined for this application, only the arms of the stirrer are protected against wear by hard overlay welding. The mill jacket is cooled with water and after the flour has been separated, the grinding beads are cooled with air before they are fed back into the mill. This is necessary to keep the temperature of the flour below 50 °C.
