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Ways of improvement of vibrational segregation and dehydration of mineral raw materials

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Category: Solid-state physics, mineral processing

Last Updated on 24 July 2014

Published on 10 July 2013

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Authors:

Ye.S. Lapshin, Dr. Sci. (Tech.), Senior Research Fellow, N.S. Polyakov Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine, Senior Research Fellow, Dnepropetrovsk, Ukraine

A.I. Shevchenko, Cand. Sci. (Tech.), Senior Research Fellow, N.S. Polyakov Institute of Geotechnical Mechanics of National Academy of Sciences of Ukraine, Senior Research Fellow, Dnepropetrovsk, Ukraine

Abstract:

Purpose. To verify experimentally the ways of improvement of vibration segregation and dehydration of mineral raw materials.

Methodology. The experiments have been carried out on the model of the vibrating sieve. Measurement of frequency and amplitude of vibroexcitation have been carried out with use of standard data-acquisition equipment.

Findings. We have established that the increase of efficiency of segregation and dehydration requires pulse impact on the sifting surface and processed raw materials. For this purpose the ‘double blow’ modes are used. They allow extracting of 30–35% of the material of -0.1 mm fineness and reducing the humidity of the top size from 30% to 14–15%. Application of disintegrant elements allows reducing the humidity of the top size from 30% to 10–12%, and extracting up to 50–55% of the material of -0.1 mm fineness. For further increase of the efficiency of the sieving it is necessary to intensify scrubbing of raw materials at the stage of its feeding and directly on the sifting surface upon condition of protection of the screen against damages. In the new method we suggest to use the activator, the vibrations of which provide intensive scrubbing of raw material and allow reducing the humidity of of the top size to 11.5% and extracting up to 51–52% of +0-0.1 mm of the material of -0.1 mm fineness. The distance from the sifting surface to the activator shouldn’t exceed the thickness of the layer of raw materials. Results are comparable to the performance achieved with use of disintegrant elements, but service life of the screen increases twofold.

Originality. The influence of the regime and design of the vibrating sieve on performance of the new way of segregation and dehydration of mineral raw materials have been determined.

Practical value. The results of the experiments allow making the choice of regime and designing data of the vibrating sieve providing required performance of segregation and dehydration. The obtained data can be useful for improvement of ways of segregation and dehydration of mineral raw materials.

References:

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Lapshin, Ye.S. and Shevchenko, A.I. (2011), “Ways of the intensification of dehydration of mineral raw materials on vibrating screens”, Zbahachennia korysnykh kopalyn, National Mining University, Dnepropetrovsk, no.47(88), pp. 144–151.

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Shevchenko, A.I. (2012), “Ways of increase of efficiency of screening and dehydration of mineral raw materials on vibrating screens”, Geotechnical mechanics: Interdepartmental collection of scientific works of IGTM NAS of Ukraine, Dnepropetrovsk, no.97, pp. 240–252.

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