Grinding & Classification Circuits

Grinding & Classification Circuits 2017-04-04T06:57:16+00:00
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Factors to consider for dry milling (2 replies)

10 months ago
Langton 10 months ago

Am looking to design a 4 to 5 ton per hour dry ball mill. What factors should I be looking for? The following is what I have: Feed size 20mm, product size 75microns, Wi 16.5kWh/ton. 

I do not what want to use any water as its washing away a lot of the free gold to the tails. Am looking at a slotted shell for the product discharge. Any ideas

9 months ago
AJNeale 9 months ago
1 like by David

My advice is to avoid dry grinding if possible.  Dry grinding is less energy efficient, requires some sort of air-swept system to get the fines out of the mill, and requires ancillary dust collection systems.  If you are concerned about washing away free gold, look at putting some sort of gravity recovery system on the mill discharge, anything from a sluice to a centrifugal concentrator. For the latter case, the mill discharge should be screened at 2 mm, and only the -2 mm sent to the concentrator.

Dry grinding can be more trouble that it is worth, so look at other options first.

Best Regards


9 months ago
Langton 9 months ago

Thanks for the advice Andrew. We do have a concentrator on the site but still the gold is being washed away after stamp milling to -2mm. There is also water issues on the site hence we looking at amalgamation after dry milling.

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