Grinding & Classification Circuits

Grinding & Classification Circuits

  • 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.

HARDNESS OF BALL MEDIA IN BALL MILL (3 replies)

m
m_aazami
2 years ago
m_aazami 2 years ago

Hello Everybody

my question is:

in whole the document about technical specification of ball charge media of ball mill, it is stated that the hardness of ball media in startup of the plant should be a little lower than ball media in continuous operation (HRC 53-58  and HRC 58-63 respectively). 

unfortunately I coudn't  find any sensible reason for this matter.

Could you please let me know the reason?

Best Regards

M.Aazami

T
Todd H
2 years ago
Todd H 2 years ago

I am not an expert on this but that level of hardness difference is basically meaningless.  I dont know if this is referring to the startup charge vs the on going ball make up or the way the balls end up after being used.  I am guessing that a little softer ball may do less damage to the mill during startup when it is essentially empty - balls banging on liners will cause breakage and excess wear.

Regards

 

Todd Harvey - Global Resource Engineering http://www.global-resource-eng.com

H
Harsh
1 year ago
Harsh 1 year ago

How to control the temperature of outlet Slide shoe bearing of ball mill in running plant so that mill not trip ?

SmartDog
1 year ago
SmartDog 1 year ago

The slightly lower hardness is to allow the media to establish a natural size distribution faster.  When the mill is first stated a guess is made is to a media distribution and then it is operated to let the media achieve its natural distribution based on actual operating conditions.  Since make-up media is normally added as the largest size and allowed to work down to the natural distribution you would like this to happen quicker, hence the softer media.

Please join and login to participate and leave a comment.