Grinding & Classification Circuits

Grinding & Classification Circuits2018-06-17T09:51:34-04:00
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Where does most of the wear occur inside a SAG mill ? (3 replies and 3 comments)

1 month ago
MSKabir 1 month ago

During rotation of a SAG mill, the three prominent zones are the grinding zone, tumbling or cascading zone and the cataracting zone (crushing zone). Are there any studies about the percentage of wear in the areas mentioned and what type of wear dominates the region? I would be really grateful to receive any feedback from experts in this area.

Alex Doll
1 month ago
Alex Doll 1 month ago

I assume you mean liner wear?

It really depends on the conditions inside the mill.  Broken liner plates happen when SAG balls are impacting the shell when over-thrown, but the liners need to be tough enough to handle a certain number of impacts due to the environment.  Too fragile a liner combined with too many impacts is bad.

Frequently head liners show high wear around the centre of rotation of the charge (the eye of the kidney) and it is common to see slightly larger deflector vanes installed at this position on the head liner to mitigate.

1 month ago

Thank you for the valuable feedback. I was looking for research papers or any modeling calculations depicting wear behaviour inside SAG mill

1 month ago
SmartDog 1 month ago

Well since the mill is rotating, the area on the liner is always changing,  given that the wear in each zone is on different material.  In the grinding and tumbling zones it is mostly on the surface of the media (and the ore of course) as a grinding/rubbing wear.  In the cataract zone it is an impact force that breaks r cracks the media (and the ore of course).  Which is why most people try to operate their mills with a minimum of cataract onto the liners.

1 month ago

Thank you so much for the valuable feedback. Correct me if I am wrong. What you are summarizing is that most of the liner wear inside a SAG mill occurs in the cataracting zone due to crushing impact compared to the grinding and tumbling zone.

3 weeks ago
mpelera 3 weeks ago

I assume you mean liner wear inside the mill, this can be a rubber liner or steel liners.
Firstly, inside the Mill, these liners are categories into three types due to its position of location inside the mill.
1. Feed End liners ...this is located on the feed spot of the mill, this is the potion which receive course material, in some Mill also they put lifters on it 
2. Liners plates, this is located on the cylindrical part of the mill and between each plate there is a lifter, for this case lifters are the ones who lift steel balls 

3. Feed Discharge liners
Those are liners on the outlet side of the mill, and sometimes contains lifters.

for my experience , the most wearing part of those liners are the feed end, due to course material entering to this portion of the mill, and the second part is the lifters located on the cylindrical part of the mill.


2 weeks ago

Thank you so much for the valuable feedback.

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