The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill. AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill.
In some plants it is necessary to add to the mill a 5 to 20% charge of large steel balls to assist the comminution process, particularly in breaking the critical size material. The addition of balls to primary rock mills reduces the benefits of autogenous operation, and has been called Semi autogenous grinding. The feed to the primary ...
SAG is an acronym for semi autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 4239; in diameter, powered by a 28 MW motor.
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If finer grinding is wanted two or three stage grinding is advisable as for instant primary rod mill with 75100 mm rods, secondary ball mill with 2540 mm balls and possibly tertiary ball mill with 20 mm balls or cylpebs.
The biggest size is chosen when the mill is used as a primary grinding mill. For fine grinding of e.g. sands, balls can be replaced by cylpebs, which are heat treated steel cylinders with a diameter of 12 40 mm and with the same length as the diameter. Ball mills are often used as secondary grinding mills and for regrinding of middlings in concentrators. Ball mills can be of the overflow or of the grate discharge type.
June 10, 2020
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