It is proposed to perform coal grading using a string screen designed at the Siberian Federal University. The screen has a simple design and is free of vibrating. It implements gravity method to feed and screen coal, which enables a driving unit to be eliminated. The screen design is presented, and its working model is manufactured. To make grading more efficient, it is suggested to equip screening panels with downtilters intended to tilt coal using the gravity force. In this case, fine particles and dust are removed from large coal lumps, which increases efficiency of the screen. The housing meant to close the screen during operation meets ecological standards imposed on mining equipment. Aiming to evaluate grading quality of the string screen, check screening of foamed polystyrene and wood composed of various size particles was undertaken. The check screening was performed separately for foamed polystyrene and wood, as well for their mixture. The foamed polystyrene grading efficiency by the string screen with the screening panels inclined at 30º and the front wall slope of 60º was 93.89–98.49%. Furthermore, grading efficiency was estimated for foamed polystyrene and polystyrene and wood mixture on the string screen model. The string screen model grading efficiency makes 81.62–98.49%, and the efficiency of grading worsens with an increase in the inclination of the screening panels and front wall.


Screen, grading, screening, screening panels, downtilter, bunker, inclination, size grade, efficiency.

Issue number: 8
Year: 2018
UDK: 622.333.622.721
DOI: 10.25018/0236-1493-2018-8-0-147-155
Authors: Demchenko I. I., Ignatova O. S., Plotnikov I. S.

About authors: Demchenko I.I., Doctor of Technical Sciences, Professor, e-mail:, Ignatova O.S., Senior Lecturer, e-mail:, Plotnikov I.S., Candidate of Technical Sciences, Assistant Professor, e-mail:, Siberian Federal University, 660041, Krasnoyarsk, Russia.


1. Tarazanov I. G. Itogi raboty ugol'noy promyshlennosti Rossii za yanvar'—sentyabr' 2017 goda [Performance of coal industry in Russian in January–September 2017: Resume], Ugol'. 2018, no 1, pp. 18—34. [In Russ].

2. Yanovskiy A. B. Osnovnye tendentsii i perspektivy razvitiya ugol'noy promyshlennosti Rossii [Main trends and development prospects in coal industry in Russia], Ugol'. 2017, no 8, pp. 10—14. [In Russ].

3. Rong Zhang. New insights into the permeability-increasing area of overlying coal seams disturbed by the mining of coal. Journal of Natural Gas Science and Engineering. 2018. no 1. Pp. 352—364.

4. Verzhanskiy A. P. Ekologizatsiya ugol'noy generatsii [Ecologization of coal generation], Ugol'. 2017, no 9, pp. 11—16. [In Russ].

5. Petrov I. V. Ekonomicheskaya otsenka energoeffektivnosti ugleenergeticheskikh tekhnologiy [Economic appraisal of energy efficiency of coal-fired power generation technologies], Gornyy informatsionnoanaliticheskiy byulleten'. 2014. Special edition1, pp. 180—189. [In Russ].

6. Plakitkina L. S. Analiz razvitiya dobychi energeticheskogo uglya v osnovnykh stranakh mira v period za 2000—2014 gg. i tendentsii perspektivnogo razvitiya [Expansion of power-generating coal mining in major countries over the period of 2000—2014 and future development trends], Ugol'. 2017, no 3, pp. 83—89.

[In Russ].

7. Demchenko I. I., Mulenkova A. O. O vozmozhnosti razmeshcheniya pererabatyvayushchego oborudovaniya v zaboe razreza dlya polucheniya sortovogo uglya [Potential of placement of preparation equipment at the face for graded coal production in open pit mine]. Izvestiya vuzov. Gornyy zhurnal. 2017, no 8,

pp. 26—32. [In Russ].

8. E. Fathi Salmi. Numerical analysis of a large landslide induced by coal mining subsidence. Engineering Geology. 2017. no 1. Pp. 141—152.

9. Jiuping Xu. Ecological coal mining based dynamic equilibrium strategy to reduce pollution emissions and energy consumption. Journal of Cleaner Production. 2017. no 11. Pp. 514—529.

10. Demchenko I. I., Ignatova O. S., Plotnikov I. I. Patent RU 2568460 MPK V07V 1/00, 20.11.2015. 

11. Volkov R. A., Gnutov A. N. Konveyery: Spravochnik [Conveyors: Handbook], Leningrad, Mashinostroenie, 1984, 367p.

12. Demchenko I. I., Plotnikov I. S. Raschet parametrov grokhota s kanatnym dvizhushchimsya polem [Rope screen parameter analysis]. Gornoe oborudovanie i elektromekhanika. 2014, no 10, pp. 30—35. [In Russ].

Our partners

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.