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Article | REF: J3051 V1

Fragmentation - Technology

Authors: Pierre BLAZY, El-Aïd JDID, Jacques YVON

Publication date: December 10, 2006

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5. Ultrafine fragmentation in a wet environment

Ultra-fine pulp mills are equipped with millimeter-sized, very hard ceramic or zirconia beads, microbeads or pearls. Intensely agitated in a pulp, the beads attrition the solids to be fragmented. All machines share the principle of forced circulation.

5.1 Cylindrical bowl machines

In the Vertimill mill (Allis Mineral System [17] ), the balls in the grinding medium are centrifuged by a rotating agitator consisting of a double-pitch screw (figure 38 ). The device combines the force of compression, due to the mass of the charge, with the forces of friction between the balls. Since 1990, this type of device has been...

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