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ArticleName Gradient vibratory segregation in loose materials size classification processes
DOI 10.17580/or.2015.05.04
ArticleAuthor Blekhman I. I., Blekhman L. I., Vaisberg L. А., Vasilkov V. B.

REC «Mekhanobr-Tekhnika» (Russia):

Blekhman I. I., Doctor of Physical and Mathematical Sciences, Professor, Head of Laboratory,

Blekhman L. I., Ph. D. in Engineering Sciences, Leading Researcher,

Vaisberg L. А., Corresponding Member of the Russian Academy of Sciences (RAS), Doctor of Engineering Sciences, Professor, Company Scientific Advisor,

Vasilkov V. B., Doctor of Engineering Sciences, Leading Researcher,


Vibratory segregation — a process of loose medium particles classification by size, density or by other properties in field of gravity or other stationary fields under vibration — is of great importance for many areas of production. It is common practice to consider that deterministic factors are essential in such processes, and vibration only «fluidizes» the mixture, creating conditions for effects of these factors. It’s often assumed that vibration amplification should be treated with caution: often it does not produce any positive effect, frequently it has the reverse effect, leading to «vibrofluidizing» when mixing and degree of chaotization of particles motion are increased. The condition of gradient (diffusion) vibratory segregation, considered in this paper, alters these assumptions. It permits to employ precisely chaotic character of particles movement in mixture for their separation. With appropriate alterations in design of separation devices, the separation process is significantly intensified. The results of experimental testing of a laboratory model of one of promising construction designs of this type of device are presented. Its special feature consists in the separation process implementation in relatively narrow chutes, on which material is vibrotransported, with screening media (sieves) installed on side walls of chutes. It was established, that, under these conditions, sieving process is as intensive, as through sieves installed in bottom part, like in conventional screens. With that, sieves holes are practically never clogged. The throughput rate and small size fraction recovery relation with device geometrics and vibration parameters was investigated.
The authors are indebted to K. S. Yakimova for the effectual assistance in implementation of this work.
The work was performed with the financial aid from the Ministry of Education and Science of the Russian Federation (the Project No. 14.576.21.0015).

keywords Vibration, loose medium, separation, gradient segregation, physical model experiment, efficiency, screening media, particle-size distribution, theory elements

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