Iudin A. V., Shestakov V. S. – The Ural State Mining University, Ekaterinburg, the Russian Federation.
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Native open pits haven’t properly mastered the technology of mineral cleaning from clay intrusions when developing
calcareous raw materials. Stationary and mobile units are used in open pits for this purpose. There are two ways
of dividing rock mass: with the use of vibration processes and with the use of machines on the basis of rotating operation
elements. Designs and raw material clay cleaning units developments are based on these methods. In the world practice
industry masters both stationary and mobile units. The majority of screen sets are created on the basis of vibration
processes. Designs of national sets are not mastered by the industry. Foreign companies develop sets with roller screens
and cylindrical screens which are used in practice. Brief characteristic of mobile units to divide clay rock mass in open pits
is introduced. Field of application, main advantages and disadvantages of mobile complexes are noted. Units’
comparatives are introduced.

Key words: mobile open pit unit; limestone cleaning; clay; mobile sets; vibrating screen; roller screen; cylindrical screen;
caterpillar undercarriage.

REFERENCES
1. Iudin A. V., Kovyrzin Iu. V., Shchavlev E. G. and others. [Limestone cleaning from clay technology development
when mining karst deposits]. Gornyi zhurnal – Mining Journal, 2009, no. 10, pp. 30–33. (In Russ.)
2. Iudin A. V., Primak V. S., Shchavlev E. G. [Mobile equipment in open pits to clean limestone from clay intrusions].
Gornoe oborudovanie i elektrotekhnika – Mining Equipment and Electrical Engineering, 2015, no. 1, pp. 3–11.
(In Russ.)