Grinding Circuits

Wet grinding of feed P80 25 - 30 mmto product size P80 0.3 mm to 2 mm (8 Mesh - 48 Mesh)

in open circuit.

One of the most common flowsheets for mineral processingplants to wet grind - 25 mm (1") feeds (or finer) to desired product size. Rod mill discharge about. 1 mm (16 Mesh).

Single stage ball grinding and single classification circuit

The most simple and common (although not the most efficient) circuit to wet grind from max. feed sizes of P80 15 mm and finer to required product sizes. Tend to produce more slimes than multistage grinds and classifying.

Autogenous-Single stage

For the rare cases where primary AG milling will inherently produce the required product size. (Wet or dry)

Autogenous + Crusher

For the also not too common cases where critical size pebbles are created and thus inefficient grinding results. With pebble ports in the mill grate and separate crushing of the critical sizes this can be remedied. However, resulting product size must match product requirements. (Wet or dry)

Autogenous + Ball Mill + Crusher

This is also called ”ABC-circuit” and has a ball mill added in comparision with the above circuit . This can be used to correct a too coarse product from the primary mill, and in this way be more useful and common. Mostly operated wet, but also dry possible.

Autogenous + Pebble Mill

Two stage AG-grinding with the primary mill in open circuit and the secondary pebble mill in closed circuit. The pebble mill gets competent pebbles screened out from the primary mill discharge as needed (or otherwise recirculated to the primary mill). Frequently used by the Boliden mines.

Autogenous + Ball Mill / VertiMill

Same as the above, but with the pebble mill replaced by a ball mill or a Vertimill. This is used when there is not enough pebbles available in the circuit, or allautogenous grinding produces too much fines.

Semi-Autogenous + Ball Mill / VertiMill

Same as the above, but with the primary mill as semi-autogenous, which in most cases means higher capacity for the circuit.

Semi-Autogenous-Single stage

semi-autogenou mill will increase capacity as well as application range, but will also increase wear costs (balls and lining) and still be dependent on ”natural” product size being close to the desired.

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Sinonine technology team