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Anonymous
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Hi guys, I'm trying to figure out the differences in Ball mills, Rod mills and roll mills, does it make a difference which type I use? I'm looking at fine gold in hard rock. K
g_axelsson said:I would suggest that a ball or rod mill should be lined on the inside. All commercial ones I've seen in mining operations have been rubber lined on the inside. The grinding action should be between rods or balls, if the drum is part of the grinding surface it will be worn through quite fast.
Göran
I was on that site as well. I wound up using a gearbox that would reduce the speed to slightly faster than critical speed.Shark said:Speed is most critical...here is a way to help get your speed right and the best description I have ever found for it...
https://www.sagmilling.com/tools_millspeed
rickzeien said:I was on that site as well. I wound up using a gearbox that would reduce the speed to slightly faster than critical speed.Shark said:Speed is most critical...here is a way to help get your speed right and the best description I have ever found for it...
https://www.sagmilling.com/tools_millspeed
Then I put a variable drive unit on it to set the proper speed.
Also it has a 60:1 gearbox that is behind the motor.
https://drive.google.com/a/group11elements.com/file/d/18DVhcmBBhNVj3Qq0LhVG2Nckm66JOiRc/view?usp=drivesdk
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The "Critical Speed" for a grinding mill is defined as the rotational speed where centrifugal forces equal gravitational forces at the mill shell's inside surface. This is the rotational speed where balls will not fall away from the mill's shell.
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