Grinding & Classification Circuits

Grinding & Classification Circuits

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Wear behavior in ball mill (mineral-steel vs steel-steel) (5 replies and 4 comments)

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facostam
6 years ago
facostam 6 years ago

Hello 911Metallurgist

I am currently working on a concentration plant, specifically on the liner change of the ball mills. I have to determine the difference in wear behavior between mineral (copper sulfide)-steel and steel-steel, all this according to the Jb. Do you have any information, or know how the Jb affects the wear of the liner? Or if the wear is greater between mineral-steel or in the steel-steel scenario.

Any help will be much appreciated

Best regards

Francisco

Paul Morrow
6 years ago
Paul Morrow 6 years ago
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Francisco, what do you mean by Jb?

When you say "mineral (copper sulfide)-steel and steel-steel" you mean to ask if a liner wears faster when is contact with steel balls VS mineral/ore?

F
facostam
6 years ago

Exactly! contact between liner and steel ball VS liner and mineral

F
facostam
6 years ago

Jb is the % of filling in the mill

Alex Doll
6 years ago
Alex Doll 6 years ago
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Hi Francisco

It is not clear if you are asking about the liner steel or the ball steel.  The best models of ball wear and the mechanisms thereof that I'm aware of are those of MolyCop in Perú & Chile (www.molycop.com) published at Procemin and IMPC conferences.  The model calibrations are currently fit to their forged balls, but you should be able to fit new constants to their equations for whatever kind of balls you are using.

I am not aware of anyone who has created a more useful liner wear model than Fred Bond's old model from the 1960's. I'd be interested in hearing from anyone who knows of one.

https://www.sagmilling.com/

F
facostam
6 years ago

Sorry for not being specific. I meant how the liner behaves against the steel ball vs the liner against mineral.

Thanks for the help

David
6 years ago
David 6 years ago
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I found that generally, mill liner wear rate is a function of RPM and ore feed size. If you run with low ore or low density, sure, it will affect wear. Running a near empty mill for too is not good for that.

We Flintstones are not that sophisticated.

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F
facostam
6 years ago

Thank you David

b
Robert
6 years ago
Robert 6 years ago
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1 like by David

The corrosion of grinding media is discussed in the following paper:

Greet et al., A protocol for conducting plant trials testing grinding media to determine recovery improvements: The Ernest Henry Mine plant trial, 43rd CMP Meeting, 2011, paper 11.

http://www.magotteaux.com/wp-content/uploads/2013/07/A-Protocol-for-Conducting-Plant-Trials-Testing-Gri.pdf

This paper also provided a good list of references to prior work on metal-metal and metal-sulfide wear and various wear mechanisms in milling environments (abrasion, attrition, and corrosion).

This body of work also covers wear of liners within mills.

M
Miguel
6 years ago
Miguel 6 years ago
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Hello Francisco,

It's quite evident that if you run the mill at a low tph as it is being designed for and at a high rpm it will be quite certain that the contact between steel liners to steel balls will be more than when you have a required ore tph with the required rpm.

Hence, steel- steel wears liners more than mineral- steel

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