Grinding & Classification Circuits

Grinding & Classification Circuits 2017-04-04T06:57:16+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Grinding.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

SAG mill and Pebble mill (4 replies and 3 comments)

9 months ago
alaz 9 months ago

hello every one

1- i am working in gold plant and my co-worker calling the sag mill

Pebble mill and i searched in google then i found sag mill is not same as 

Pebble mill if you can help me and explain the different  to me i will be happy.

2- in my plant the sag mill discharge has vibrating screen the overflow will goes to cone crusher is that why they calling it Pebble mill?

thank you

9 months ago
hassannoori 9 months ago

Actually the oversize of screen after AG or SAG mill is called pebble and then the cone crusher in this circuit is called pebble crusher. SAG mill is Semi-Autogenous Mill which there is up to 15% ball inside and AG mill is Autogenous Mill which there is no ball inside the mill.

Hope it helps


9 months ago

Thank you mr hassan it helped a lot

Bob Mathias
9 months ago
Bob Mathias 9 months ago

Hassannoori is correct.

See, the large openings in the SAG discharge grate are to let the large harder rocks (pebbles) come out and go to your crushers, the "pebble crusher" for easier size reduction.

Image result for sag mill pebbles

9 months ago

Thanks a lot mr bob mathias

9 months ago
Modine96069 9 months ago

Bob and Hassannoori have answered your question.  SAG mills will contain some degree of steel media, generally 8 - 12%.  SAG Mills tend to have large diameters and short lengths.  Pebble Mills, also called Tube Mills, use pebbles to grind grit to powder, and are long Mills with a small diameters.  Pebble Mills contain no steel grinding media

9 months ago
dk 9 months ago

SAG mill there will be either steel balls or harder ore as grinding media . There may not be any cone crusher for grinding the vibrating screen oversize and the same is recirculated back to SAG .If the mine has also harder ore and majority softer ore, the harder ore may be utilised as grinding media after size reduction with necessary intermediate bin.

9 months ago

Thank you mr dk

Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.


We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.