kiwi_cement
1 posts
TimePosted 17/07/2008 22:33:39

Mill to Blaine or Mill to residue

I was just wanting to get peoples thoughts on both processes and the pro's and con's of each. We have been using the Mill to residue technique but that is affecting some of our customers. Hence we changed back to Mill to Blaine, but have halved our output capacity and increased operating costs.

Any comments would be apreciated....

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Michael Clark
312 posts
TimePosted 23/07/2008 09:56:49

Re: Mill to Blaine or Mill to residue

There are advantages and drawbacks to controlling cement fineness to Blaine or to residue. Really you need to control to both by varying the fresh feed rate and the recirculating load.

Best regards

Dr Michael Clark 

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rrbs
10 posts
TimePosted 23/07/2008 10:41:59
rrbs says

Re: Mill to Blaine or Mill to residue

Normally a steeper distribution is expected to give a lower blaine than a wider distribution, the extent depends on the type of circuit u r operating with.surely basic operations with feed rate and recirculation will help as Mr.clark suggests.

but the mill output getting down to half, suggests possible grinding inefficiency of the mill. try to optimise on the grindability and air balance of the mill circuit and also check if u r really grinding it too fine than earlier.

what is the type of mill u r operating and what is the fineness level in both cases?. 

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Mr_Keef
4 posts
TimePosted 18/02/2009 16:31:05
Mr_Keef says

Re: Mill to Blaine or Mill to residue

My experience is that for open circuit mills with a wide particle size distribution SSA(blaine) control is best, however for a C/C mill with a modern separator the narrower PSD resulting from this lends itself better to residue control. Also use of a grinding aid can improve residue at a certain blaine by improving the particle separation.

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