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Extrusion of HPGRs

Extrusion is a phenomenon whereby the HPGR product stream emerges from the com- pression zone at a speed greater than that of the roll surface. This is similar to the well- known extrusion effect observed in metal rolling and occurs when the product flake expands as it leaves the compression zone and the applied pressure reduces to zero. This expansion is typically in the order of 2% to 5%, and the resultant slippage can be the cause of increased roll wear. Extrusion has generally been observed to increase with roll diameter, but also has been recorded with pilot-sized machines. Extrusion also increases with applied pressure and feed moisture, and the evidence available suggests the effect is most pronounced at a roll peripheral speed of about 1.5 m/s. It is most noticeable with smooth rolls, and decreases markedly with studded or profiled surfaces.


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