Grinding & Classification Circuits

Grinding & Classification Circuits

  • To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN
  • 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.

Ball Mill scale-up factors (3 replies)

(unknown)
8 years ago
(unknown) 8 years ago

Apart from Bond's EF factors (CA Rowland), what other scale-up factors are applied to lab BWI for large-scale ball mill sizing?

O
OberstGruppen
8 years ago
OberstGruppen 8 years ago
Like

Do look into the Mib (Morrell 2008) it is a derivative of the bond BWi test and uses product size, feed size and Gbp to modify the index.

(unknown)
8 years ago
(unknown) 8 years ago
Like

I'm not too sure modifying the Gbp only once is sufficient. Anyhow, Bond's wet to dry milling EF factor is 1.3, what's your view i.e. does dry milling consume 30% more power than wet milling?

Maya Rothman
8 years ago
Maya Rothman 8 years ago
Like

The EF factors are usually sufficient to size a large ball mill. There used to be a discussion in the industry about whether they were suitable above, if I remember correctly, 18 ft diameter. That discussion is now over and large mills are successfully being sized up to 27 ft using Work Index methods (Esperanza).Do watch that if a SAG mill is feeding a ball mill, you must correct the ball mill.

Please join and login to participate and leave a comment.