US Patent 7963470 Discharge from grinding mills

A screening element can be mounted at a discharge passage of a grinding mill chamber. The discharge passage is positioned in use to receive ground particles moving thereinto in a discharge direction. The screening element comprises one or more openings defined therein that are oriented such that ground particles pass therethrough in a direction that is oblique with respect to the discharge direction. The grinding mill chamber may form part of a centrifugal grinding mill.