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.

why lead zinc ore grinding mills prefering casting high chrome grinding balls not forged balls? (4 replies and 1 comment)

H
banyechan
7 years ago
banyechan 7 years ago

why lead zinc ore grinding mills prefering casting high chrome grinding balls not forged balls?

Can anyone give me some ideas?

Alex Doll
7 years ago
Alex Doll 7 years ago
Like
1 like by David

Forged balls can put iron ions into solution that interfere with zinc flotation.  High-chrome balls don't put nearly as many ions into solution.

https://www.sagmilling.com/

H
banyechan
7 years ago

Thank you!

M
BAUD
7 years ago
BAUD 7 years ago
Like
1 like by David

Forged balls have a low carbon content compared to high chrome grinding balls. They have two different types of heat treatments in order to improve their metallic structures and especially their hardness. During the wearing process in the ball mills, the hardness of forged balls decrease more quickly from the surface to the inside than for the high chrome grinding balls. Used forged balls have a low hardness than the high chrome balls at the same radius. Grinding parameters are in favor of high chrome grinding balls in the same conditions.

Baudouin

 

P
max skinner
7 years ago
max skinner 7 years ago
Like

I operated a lead, zinc flotation plant for 10 years and the only difference I could see is that the high chrome balls are harder and your cost per ton of ore for balls goes down with the use of the chrome balls. This was significant with the very hard metamorphic scarn that the ore minerals came in at this mine.

 

Metsol
7 years ago
Metsol 7 years ago
Like
1 like by David

Max is quite correct re: the chrome balls are harder but after some laboratory and plant work a few years ago it was clear that the forged balls have an adverse effect on the redox potential of the feed to the flotation plant.  Definitely reduced the overall recovery (possibly due to the increased iron in solution)

 

Please join and login to participate and leave a comment.