Ball Mill - Trommel Sizing

http://lmgtfy.com/?q=trommel+sizing+calculation%2Fliterature+for+Ball+mill+application&l=1

I believe that a trommel manufacturer would be a good place to start.

Don't you?

Where have you looked so far?

Hi Lyn,

I mave three quoatations from three different trommel vendors with three different trommel sizes...Now i want to review these trommel sized from my end.....

Thats why i am looking for some literature on trommel sizing...

It seems to me that you are looking for a trommel in isolation of the entire system. Surely the initial ball mill sizing exercise was based on your process parameters. If you have those details and have provided them to the various bidders, one would think that if they are competent, they would all come back with something quite similar. This obvioulsy isn't the case. Your concern is justified. However, trying to verify the design of a critical component such as this in-house is akin to saying that you're going to design a pressure vessel if only somebody would give you the proper formulas

Your current results clearly indicate that you should engage the help of an expert rather than continuing to fly by the seat of your pants. At least then you'll have a better idea of what is happening and what is required.

Our focus is ensuring that the liner and structural bolts don't fail on large mills so, we can't help you with the design. However, if you provide some process details, maybe we can stear you in the right direction.

Below is the service data for the trommel. Three bidders have quoted three different trommel sizes the below service data provided to them.

SERVICE DATA:

• Mill size, type : Dia 18' x 32' lg, Wet mill

• Ball discharge to trommel inlet : 325 dmtph new feed + 350% recirculation, 1463 dmtph total

• Ball product/trommel feed, P80 feed size : 70 to 75 microns

• Slurry specific gravity : 3.82

• Ore specific gravity : 4.85 to 5

• % Solid : 70%

• Nominal rpm : 13.73

• Trommel Rotation : Counter clockwise (Facing discharge end)

• Panel slot size : 12 mm x 48 mm - To be confirmed by vendor

• Slot orientation : Circumferential (Perpendicular to mill axis)

• Minimum open area : 25 % min

• Panel Material : Rubber

Hello Nitin,

I must apologize: this clearly isn't a "seat of the pants" exercise on your part. I can also now see the root of your concern; it's very unusual indeed when each bidder comes back with a design significantly different than the others when given such clear specs. Have you submitted your RFQ to the OEMs directly? I would be wary of receiving custom-designed process equipment from a low-cost Pirate manufacturer. These parties may be relatively capable fabricators of copies or developers of new equipment based on first-generation technology but personally I wouldn't trust their current-technology design capabilities. On the other hand, I'd be quite comfortable with established OEMs. Have you contacted, for example, FLS? They have a major comminution design centre as well as manufacturing capabilities relatively nearby in India. If you haven't already, I strongly urge you to speak with them.

I cannot promise anything but I will also pass this information along to see what becomes of it.

If there is need for further communication, please let's do it via normal channels rather than in this forum. Although I can't provide my direct email address here, you can contact me via projects(at)heviitech.com

Good luck!