Grider For 6mm Limestone
Dear Sir,
A ball mill is suitable for very fine grinding of your type of powder. However, it is not well suited for the coarse milling you specify and will be generally inefficient.
Prater-Sterling's "EVOLUTION SERIES HAMMERMILL" is a suitable technology for your size range and is more energy efficient than any other hammermill offered on the market today.
To discuss further or to arrange a test of your material, please contact us.
Regards,
Darrell Malczewski
Prater-Sterling
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Re: Ball Mill For Coarse Milling Of Limestone
Dear Darrell,
Thanks for your input.
Can the hammer mill suggested by you be used in place of the Vertical Shaft Impactor ? We have proposed to use ball Mill anyway to go down to 5 to 7 microns, starting with < 2 mm.
If the special Hammer mill which you have suggested can grind from < 32 mm directly to d50 of 5 to 7 microns , it should be interesting.
Can you share with me specific operatig data on limestone grinding by the specail hammer mill? The on-line brochure seems to be too general in nature and does not make any special mention about limestone grinding, which is of our interest. ■
Re: Ball Mill For Coarse Milling Of Limestone
Amitava,
Based on a review of our test data-base, the hammermill should be able to replace the vertical shaft impactor to process <32mm material to <2mm material.
Because the hammermill typically operates at a higher tip speed than a VSI (19-21K FPM vs. 10-15K FPM), you should expect an appreciable improvement in fineness. However, the hammermill would not be suitable for manufacturing the material to a 5-7 micron range.
The fineness and production rate will largely be dependent upon the grade of limestone used (composition, hardness and the level/ type of impurities). Typical rates range anywhere from 100 to 500 lbs/ hr for each HP utilized.
We suggest further discussion on this subject off-line, through email, and possible testing. We can also provide you further information on the hammermill, along with a budgetary offer.
Please reply to:
Darrell Malczewski @
dmalczewski@praterindustries.com ■
Limestone Grinding
Rod mill is suitable for course grinding. The mill will accept -25 mm limestone as feed material.
You can also consider a verticle impact crusher in close circuit for production of course product here again feed size can be -50 mm.
You can also consider use of a roller press in close circuit for course grinding.
Any size reduction equipment will give a product which will have a size range which when plotted on a graph will show a fraction which will be beyond narrow range you want as a product. Oversize you will recycle in close circuit. Undersize has to be rejected - fortunately you also want to produce a fine fraction. This undersize can be feed to the ball bill for final grinding.
Without knowing bond index of limestone and nature of limestone deposit (massive / sedimentary / marl etc.) it is difficult to give an idea of power requirement for course and fine grinding. Power consumption will also depend on type of equipement used. ■
Ball mill for coarse milling of limestone
We want to reduce the size of limestone from100 % material <6 mm to 100 % material < 2 mm. Will a ball mill with a sieve classifier be suitable? If so, what may be the sp. power consumption?
We expect to generate 100 % material <6 mm by tertiary crushing in a VSI which will take in a feed containing 100 % material <24 mm.
AMITAVA: (chempro@blr.vsnl.net.in) ■