Grinding & Classification Circuits

Grinding & Classification Circuits

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Odd shape of wet ball mill ball scats. (1 reply)

1 month ago
evandewitt 1 month ago

Our wet Ball Mill griding media reject (scats) from the trommel screen is an odd shape ( see photo attached). I’m not use to this wear shape of grinding media in a ball mill. Normal wear of grinding media in my experience is down from a spherical to a non-spherical (egg shape) or a homogenic spherical wear to a smaller size, not the octagon / nonagon shapes. My experience and test done in the industry has proven that these odd shape media migrates to the center of the ball mill charge and results into a dead non active grinding area. All ball mills do have this area, although it differs in size. The odd shape of the scats prevents this media to have a rolling/grinding effect in the mill. Only eat away on the mill electrical power consumption. 


3 days ago
David 3 days ago

And what is your question exactly?

octagon/nonagon shapes ball leftovers are the result of a soft inner core - 55 to 59 Brinell.

spherical to a non-spherical (egg shape) will result from a harder core 60 to 65 Brinell.

If these chips accumulate in your mill... increase your operating density solid % to purge/float them out.


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