Rotor flow matching to mineral breaking chamber

Abstract

In a rotary mineral crusher a method of either localising the wear on a weir tip ( ) in the crusher and/or focusing the output of the rotor ( ) into its interaction chamber and/or reducing mineral erosion of the exterior of the rotor ( ) by mineral piece particles energised by the output from the rotor ( ). The rotary mineral crusher is of a kind having a rotor ( ) into which the mineral pieces to be reduced in size, that is crushed, are fed from above and least substantially axially over the axis of rotation of the rotor ( ) to thereafter migrate on an acceleration locus or loci of migration there retained bed or retained beds of mineral pieces from the rotor ( ) substantially radially of the rotor ( ) into the surrounding interaction chamber capable of retaining the lining of the mineral material. The method comprises or includes retaining the, or each, rotor ( ) retained bed of mineral pieces with weir-like means defining a sacrificial edge or weir tip ( ) over at least substantially the traverse extend of a migration locus at each edge. The sacrificial edge is of the form which allows an enhanced flow of mineral pieces over a preferred region of the sacrificial edge without reliance for such enhanced outflow ( ), on a symmetric “V” or “U” or scallop. The means to retain the lining of mineral pieces of the surrounding interaction chamber is also configured so as to provide a preference for interaction of mineral pieces in a zone of the surrounding chamber adequately lined with such mineral pieces. Optionally, there is also provided shielding means ( ) to at least substantially confine the mineral pieces of the interaction zone from the rotor ( ), save over the enhanced outflow ( ) focus, and thereof at least towards the retained lining of the mineral pieces of the interaction chamber.