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A hydrocyclone with involute feeding.

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Mt Isa No 4 concentrator in 1976 showed the 12.5 ft rod mills were operating at an average inefﬁ ciency of 1.25 and the 16.5 ft ball mills with an efﬁ ciency of 0.88. A study carried out by the author in 2004 on the Worsley Alumina Rod/Ball Circuit Line No 1, showed efﬁ ciencies of 1.27 for the rod mill and 0.67 for the ball mill.

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GOLD FIELDS GRANNY SMITH GRINDING CIRCUIT A METALLURGISTS JOURNEY OF PROGRESSION The circuit was characterised by a high circulating load around the ball mill, with a bank of 20 inch (CAVEX 500) cyclones generating a coarse overflow P80 size of around 200181m to 220 Gold Fields Granny Smith Grinding Circuit A Metallurgist's Journey

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