Grinding & Classification Circuits

Grinding & Classification Circuits

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SAG Mill Bolt (3 replies)

m
hulk
6 years ago
hulk 6 years ago

hi,how are you

What are the reasons and solution for Sag mill bolt breakage? Tell us about effect of changing liner geometry type of material and metallurgical operation conditions on bolt  breakage.

thanks

David
6 years ago
David 6 years ago
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Was the bolt torqued correctly?

Was lubricant used on the bolt (effectively lowering the required torque value)?

Is this only one broken bolt? How many?

If not have the bolts tensile strength and other metallurgical properties(tempering etc) been tested?
How thick is the rubber backing in the mill?

Given the lack of detail, its a bit hard to say...

D
Don Yates
6 years ago
Don Yates 6 years ago
Like

David is on the money.

Additionally, lock nuts with nylon inserts etc will also work loose depending on the number of hits to the lifter bars inside the mill.

Yes, bolt tensions can be continuously and remotely monitored. (Something we do). It can also dramatically reduce shutdown times when SAG mills are religned.

S
sslupsky
6 years ago
sslupsky 6 years ago
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As mentioned earlier, there could be a number of reasons.  We helped investigate bolt breakage of a rod mill by monitoring bolt tension.  The key finding from that work was minimizing liner movement was key to addressing the problem. 

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