Patent ID: 9289775
Filing Date: 2016-03-22
CPC Classification: B02C

Claim Text:
1. A grinding mill comprising a shell defining a mill shell chamber therein rotatable in a predetermined direction about a central axis thereof to produce a slurry including liquid and particles from a charge located in the mill shell chamber, the grinding mill comprising: a discharge end wall attached to the shell, the discharge end wall extending between an outer edge thereof connected to the shell and an inner edge at least partially defining a central opening in the discharge end wall; a plurality of pulp lifter chambers at least partially defined by the discharge end wall; and a plurality of discharge grate assemblies, each said discharge grate assembly being positioned to at least partially control flow of slurry into each said pulp lifter chamber respectively; each said discharge grate assembly being rotatable in the predetermined direction between a lowered condition, in which the slurry is flowable through at least part of the discharge grate assembly, and a raised condition, in which the discharge grate assembly is positioned above the charge; each said discharge grate assembly comprising: