Patent ID: 6874714

Claim:
A rotary mineral breaker comprising: a rotor to rotate about a substantially vertical rotary axis, the rotor having an inlet for mineral pieces, the inlet being substantially parallel to the rotary axis thereof from above and at least one peripheral exit port for the mineral pieces to exit in a modified form radially of the rotor into a surrounding mineral piece interaction zone, and, in use, for each exit port there is a retained bed of mineral pieces having (a) a greater vertical extent inwardly of the exit port than at the exit port, and (b) starting higher inwardly at the exit port, and at a trailing boundary of each exit port there is at least a sacrificial member acting as a weir for the retained bed of mineral pieces and over which other mineral pieces may be flung, said retained mineral pieces extending inwardly to a backup form which limits inward intrusion of the retained bed.