Nadutiy V.P., Chelyshkina V.V., Loginova A.A. Results of investigations of vibrational screening of tuff by size 5,0-0,1 mm

Details

Parent Category: Geo-Technical Mechanics, 2020

Category: Geo-Technical Mechanics, 2020, Issue 150

Geoteh. meh. 2020, 150, 54-63

https://doi.org/10.15407/geotm2020.150.054

 

RESULTS OF INVESTIGATIONS OF VIBRATIONAL SCREENING OF TUFF BY SIZE 5,0-0,1 MM

¹Nadutyi V.P., ¹Chelyshkina V.V., ²Loginova A.A.

¹Institute of Geotechnical Mechanics named by N. Poliakov of NАS of Ukraine, ²National Technical University «Dnipro Polytechnic»

UDC 622.7:621.928.235:51-74

Language: Russian

Annotation.

Tuff reserves in Ukraine are very great; tuffs extend in the form of strips 1-10 km wide at a depth of 5 m to 200 m along the Western wing of the Polesie saddle and the Western slope of the Ukrainian shield.  In Rovno and Volyn regions, tuffs are found in overburden rocks in basalt quarries and in the basalt massif bed, where thickness of the tuff layer varies from 1-2 m to 140 meters.  Tuff is used in agriculture as a fertilizer and feed for birds and animals, for grain storage, as well as a binder, heat insulator, sorbent in medicine, chemistry, construction.  Tuffs attract particular interest due to the presence of precious metals: copper content is up to 0.7-1.0%, iron - up to 50 %, titanium - up to 4.0%. Therefore, it is urgent to develop a comprehensive waste-free technology for processing tuffs, an important element of which is the classification of raw materials. It is considered that among the known vibratory screens the most effective are screens with rubber band-string sieves RBSS. The aim of this work was to establish analytical dependences of the efficiency of tuff vibration screening by classes 5 - 0.1 mm on the regime and design parameters of the RBSS screens, which had not been investigated before.  The methods of pair correlation and multiple regression analysis were used. The analysis of pair correlation dependencies showed that with a decrease in the size of the screen the frequency of oscillations of the working body should increase. For screening the size of 5-2 mm, rotary speed 1300 rpm is recommended and 1500 rpm for the size 0.5-0.1 mm; the rational angle of the exciting force of forced vibration is 45-55°. Regression models of efficiency dependence on variable parameters are obtained for each of the screening sizes: 5; 3; 2; 05 and 01 mm, as well as for classes 5-2 mm and 0.5-0.1 mm.  It is established that with decreasing sieve size for the sizes 5 mm, 3 mm and 2 mm, the dependence between the screening efficiency, tilt angle of the forced vibration exciter, specific load on the screen and the screen tilt angle increases. When reducing the size of the sieve from 0.5 mm to 0.1 mm, the dependence of the efficiency on the angle of the exciter inclination and specific load increases, while the influence of the rest parameters decreases in the following order of decreasing degree of the influence: angle of the screen inclination, its length, frequency of oscillations of the working body. The presented models make it possible to solve particular problems of selecting parameters and determining efficiency of the tuff vibroscreening at the stage of ore preparation in the complex technology of tuff processing.

Key words:

vibro-classification, tuff, correlation, regression

References

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About the authors

Nadutyi Volodymyr Petrovych, Doctor of Technical Sciences (D.Sc.), Professor, Head of Department of Mechanics of Mineral Processing Machines and Processes, M.C. Poliakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepr, Ukraine,  This email address is being protected from spambots. You need JavaScript enabled to view it.

Chеlyshkina Valentyna Vasylivna, Ph.D. (Tech.), Senior Researcher of Department of Mechanics of Mineral Processing Machines and Processes, M.S. Poliakov Institute of Geotechnical Mechanics under NAS of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Loginova Anastasiia Oleksandrivna, Candidate of Technical Sciences (Ph.D), Researcher of Department of Mechanics of Mineral Processing Machines and Processes, Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Science of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine,  This email address is being protected from spambots. You need JavaScript enabled to view it. .

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