Grinding & Classification Circuits

Grinding & Classification Circuits

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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


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.



Todd Harvey - Global Resource Engineering

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 ?

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.

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