Grinding & Classification Circuits

Grinding & Classification Circuits 2017-03-23T09:46:37+00:00
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Suggested rubber shell liners & lifter bar thickness (4 replies)

SAKAR
3 months ago
SAKAR 3 months ago

i am designing rubber lining for ball mill with below given operating condition can you please suggest me approximate thickness of shell liners and lifter bar ?

OPERATING CONDITIONS:

1. MATERIAL                              :  MAGNETITE ORE + URANIUM ORE (COMBINED)

2. FEED SIZE                        :  MAGNETITE ORE, 80% (-) 125microns & URANIUM ORE, 80% (-) 75MICRONS

3. PRODUCT SIZE                      :  90% (-) 53microns (+/- 5microns) AT HYDROCYCLONE OVERFLOW.

4. TYPE OF GRINDING               :  WET, continues

5. CAPACITY

(i)  COMBINED FRESH FEED RATE       :  11.0 tph DESIGNED & RATED

(iI)  MAGNETITE ORE                          :  6.6 tph DESIGNED & RATED

(iII) URANIUM ORE                              :  4.4 tph DESIGNED & RATED

6. MILL SPEED                           :  22rpm (APPROX).

7. BALL SIZE DISTRIBUTION       :  40mm DIA. - 12.5mt; 25mm DIA. - 8.5mt

8. MATERIAL OF                        :  HIGH-CHROME

   GRINDING MEDIA

9. WT. OF GRINDING MEDIA      :  21mt.

10. MILL HEAD ANGLE               :  11.5 DEGREE

11. SP. GR. OF MAT'L.               :  5.15 FOR MAGNETITE ORE & 2.80 FOR URANIUM ORE

12. BWI                                      : MAGNETITE ORE - 17.2kWh/mt. & URANIUM ORE - 11.0kWh/mt.

13. LINING TYPE REQD.            :  MILL SHELL SHALL BE LINED WITH SUITABLE RUBBER LIFTER BAR WITH INTERMEDIATE LINER ALONG EACH ROW. MILL HEADS (FEED END & DISCH. END) SHALL BE LINED WITH SUITABLE RUBBER LIFTER BAR WITH INTERMEDIATE LINER.

14. FIXING WITH SHELL            :  BOLTED & HEADS

15. Mill ROTATION                     :  C.C.W. LOOKING FROM FEED END.

max skinner
3 months ago
max skinner 3 months ago

There are numerous people who make rubber liners for ball mills, google manufactures of rubber liners for ball mills and a bunch of them will come up. You just contact them with this information and they will tell you exactly what you need at no cost, of course they will want you to buy their liners. I have had real good luck with Trelleborg out of Sweden.

David
3 months ago
David 3 months ago
1 like by Rheomet

Thanks Max. Yes Trelleborg has good engineers. It looks like SAKAR, from the compression rubber molding industry, is trying actually manufacture liners himself.  It would have been nice to know the actual size of your mill Sakar. The bolt hole spacing too.

Anyway, I will guess this is a 2-2.5 meter diameter mill. Without knowing anything else, start with this:

Use around 110 mm center to center for lifter bars.

Do not go crazy adding too much lift/height to your bars in hopes of increasing wear life. It will kill capacity.

Good luck in your rubber ball mill liner fabrication adventures.

A good resource https://www.trelleborg.com/engineered-products/~/media/engineered--products/solutions--and--products/mill--lining--systems/mill--liner--kits--product--brochure.pdf

SAKAR
3 months ago
SAKAR 3 months ago

Thanks David,

The detail send by you is very helpful to me. As your require of real size of ball mill i have attache drawing of ball mill  for your reference. if possible can you suggest me for side wall rubber lining ?

David
3 months ago
David 3 months ago
1 like by Rheomet

Same profile. Just increase the spacing at the shell/head joint. See this photo of inside a ball mill and its liner arrangement.

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