16 posts
re BLAINE AND POWER AND TPH RELATIONSHIP
Hello XXXX and lalbatros
I understand few things and can explain few others.
Lalbatros: Could you also explain what is meant by "Residue" in Formula-4, is that the residue on 30µm ?
No, not necessarily 30µm; It is actually agreed by client and supplier as a general statement it's 90µm for Rawmeal and 45µm for Cement.
Lalbatros: As a first comment, I would question first which fineness measurement is the best suited to predict power consumption. Would it be the Blaine, or would it be the residues? Or, maybe, is the correlation between Blaine and Residue so strong that both are equivalent?
As you suggested these are equivalent for constant RRSB parameters (Position paramenter and slope - Which is generally the case with newly supplied seperators; in due course of time these parameters are likely to "swing")
Lalbatros: ntuitively, I would prefer the Blaine to correlate with power consumption.
That's because, I spnotaneaously think that grinding is about creating surface and this is what the power consumption goes to ... but with a very bad efficiency!
Yes, Blain is a equaly good parameter to corelate, It is also indication of quality (Hence prefered; altough RRSB Paremeters predicts qulaity of cement well, but involves certain anomilities)
Finally, let me observe that it is possible to have rather different Blaines for the same residues, specialy if the slope of the Rosin-Rammler curve is different. Would it mean that residues and blaine do correlate well only on ball mills and in certain conditions that ensure a standard slope of the RMM curve?
Yaa, It's a proven relationship that different blaines are possible for same residue (As a crude example: @ 3600 blain VRM (ok mill) will have a RRSB slope of 0.95 (Approximate), similar blain in ball mill will have higher slope around 1.1), which clearly indicates diffrent residues for same slope.
This relations are very well described by K. Kuhlmann, H.-G. Ellerbrock and S. Sprung from VDZ in the articles entitled "Particle size distribution and properties of cement Part I, II and III". if you are intrested in reading this articles let me know.
XXXX :HOW THE POWER OF 1.3 FOR OPEN & 1.4 FOR CLOSE CKT IS OPTAINED?
PLEASE TELL ME THE DERIVATION OF THE SAME
please be noted that it's 1.3 and 1.4 not exactly constant all the time; "we" at FLSmidth use to collect data from sites (Experimental data) - where grinding equipments are operating perfectly and then this data is stastically anlysed and non-linear regression curve is obtained with a slope.(which generally lies in the vicinity of 0.45 and 0.43)
Regards
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re BLAINE AND POWER AND TPH RELATIONSHIP
These formulas are all purely empirical.
Even worse: the conditions of applicability are not provided or not known.
They probably reflect one given experiment on one given cement plant.
They contain very little information, not more than a few experimental data points would.