ISSN:
0934-0866
Keywords:
Chemistry
;
Industrial Chemistry and Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Fluid classification methods for particle size analysis are based on the concept of cut size. The particles suspended in a fluid are passed through several separation stages, of progressively finer cut-size, so that each stage collects a fraction of the feed solids in the same way as each screen in a stack of sieves.There is an inherent error involved in the data reduction, which often leads to a poor comparison between the results of fluid classification and sedimentation, although both in principle measure the equivalent Stokes' diameter.This paper investigates the problem and attributes the above mentioned error to the difference between the equiprobable size and the analytical cut size. The paper presents a simple correlation which relates the analytical cut size and the equiprobable size if both the measured size distribution and the grade efficiency curve of the separator follow, approximately, log-normal functions. The usefulness of the correlation is exemplified in the case of the Bahco analyser. Measured grade efficiency curves for each separation stage provide the necessary data for the above mentioned correction and this is then applied to examples of practical particle size analysis.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/ppsc.19840010128
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