Grinding & Classification Circuits

Grinding & Classification Circuits 2017-03-23T09:46:37+00:00
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How to increase D50 value in ball mill (4 replies)

Shahid Rind
5 months ago
Shahid Rind 5 months ago

How do I increase d 50 value for caco3  45 micron in ball mill? What are the parameters for ball mill to making d 50 value 10 to 13. We are running CaCO3 45 um in ball mill but D50 value is not increasing more than 8 for making more coarser. I also decrease classifier speed till 300 but no change. Please guide me thanx

Paul Morrow
5 months ago
Paul Morrow 5 months ago

What classification system do you have? Cyclones (vortex/apex dimensions)? Screw/spiral/rake classifiers? Type of mill ( dimensions?) Grinding media size? What is the current plant tonnage? Current %solids/density coming out of the grinding circuit?

AJNeale
5 months ago
AJNeale 5 months ago
1 like by David

If I understand it, you want to increase the cut size in (I'm assuming) the cyclones.  Assuming this is a conventional ball mill in closed circuit with cyclones, then in general, this can be achieved by installing a smaller apex, a larger vortex finder, decreasing the pressure in the cyclone header, and/or reducing cyclone feed density (i.e. less water to the cyclone feed pumpbox) - or some combination of all of the above.  However, if this is a longer term target, then you should look at decreasing the power input to the grinding circuit.  This can be achieved by dropping the ball charge in the ball mill, i.e. simply charge less balls per day (but don't stop charging balls), to drop the power draw.  Other options involve slowing the mill down, either by installing a VFD (somewhat expensive depending on the size of the mill motor) or changing the pinion (more expensive and significant down time).  As always, make one change at a time, and quantify the before and after to make sure you are heading in the right direction.  I hope this helps - Andrew

Aminpro
5 months ago
Aminpro 5 months ago

Do you want to increase the D50 while maintaining the D80 relatively constant?

Sugar Watkins
3 months ago
Sugar Watkins 3 months ago

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