Mekhanobr Engineering JSC (Russia):

Vasilyev A. M., Ph. D. in Engineering Siences, Reasercher
Frolov V. V., Engineer

E-mail (common): science@mekhanobr.spb.ru

The paper is devoted to the study of specialties of granular ores and materials size distribution characteristics determination methods on testing sieves (analyzers) of different design: VP-30T of «Vibrotechnic» Co., ASV-200 of Research-and-Production Group «Mekhanobr-Tekhnika» and Ro-Tap of Tyler Co. Sieving duration and mass of starting weighed sample were chosen as the factors affecting screening process efficiency. The method of second-order rotatable design planning was used in the experiments. It was established that VP-30T testing sieve may be used with the analyzed material mass not exceeding 80 g with necessary duration of sizing at least 90 min. With that, screening efficiency in fine size fractions (–0.074 mm) will be about 65 % (previously stated 95 %). Analyzer is recommended for application only to determine size distribution characteristics of various concentrates and middlings with low content of –0.074 mm size fraction. Analyzer ASV-200 may be used with mass of starting weighed sample not exceeding 200 g, which permits to size to –1 mm a representative sample with a considerable content of –0.074 mm size fraction. The best efficiency indicators in –0.1 and –0.074 mm size fractions — over 97 % — were shown by Ro-Tap analyzer. This analyzer may be used not only for determination of standard size distribution characteristics under different conditions, but also as an apparatus for working with narrow size fractions of large starting mass – up to 600 g. So, as a result of the experimental studies, a general-purpose method has been developed for performance of sieve analyses by means of analyzers of different design. The proposed sequence of actions permits to obtain on different analyzers the same data for the same ore sample regardless of apparatus type and ore physical properties. The method was tried and tested on two types of gold ores.

1. Andreev S. E., Perov V. A., Zverevich V. V. Drobleniye, izmelcheniye i grokhocheniye poleznykh iskopayemykh (Crushing, grinding and sieving of minerals). Moscow, Nedra, 1980, 415 pp.
2. Andreev E. E., Tikhonov O. N. Drobleniye, izmelcheniye i podgotovka syrya k obogashcheniyu (Crushing, grinding and preparation of raw material for beneficiation). St. Petersburg, St. Petersburg State Mining Institute, 2007, 439 pp.
3. Abramovich I. M. Some regularities of the screening process. XV let na sluzhbe sotsialisticheskogo stroitelstva. Yubileynyy sbornik instituta Mekhanobr (XV years in the service of socialist construction. Mekhanobr Institute jubilee collection), 1935, pp. 367–410.
4. Abramovich I. M. Analiticheskiy metod otsenki rezultatov grokhocheniya (Analytical method of screening results assessment). Moscow, Gostoptekhizdat, 1940, 44 pp.
5. Andreev S. E., Tovarov V. V., Perov V. A. Zakonomernosti izmelcheniya i ischisleniye kharakteristik granulometricheskogo sostava (Laws of grinding and particle size distribution characteristics estimate). Moscow, Metallurgizdat, 1959, 437 pp.
6. Astafyeva E. A. Experimental study of the effectiveness of screening narrow size fractions, depending on their size. Novyye issledovaniya v khimii, metallurgii, obogashchenii (New research in chemistry, metallurgy and mineral processing). Leningrad Mining Institute, 1975, Iss. 7, p. 37.
7. Astafyeva E. A. Prediction of the particle size distribution of the screening product. Ibidem, pp. 7–11.
8. Zverevich V. V. Effect of milling conditions on the particle size distribution of the ball mills product. Gornyi Zhurnal = Mining Journal, 1951, No. 6, pp. 34–37.
9. Olevskiy V. A. Razmolnoye oborudovaniye obogatitelnykh fabrik (Grinding equipment for concentrating factories). Moscow, Gosgortekhizdat, 1963, 447 pp.
10. Vaisberg L. A., Rubisov D. G. Vibratsionnoye grokhocheniye sypuchikh materialov (Vibratory screening of bulk materials). St. Petersburg, Mekhanobr, 1994, 47 pp.
11. Gazaleeva G. I., Tsypin E. F., Chervyakov S. A. Rudopodgotovka: drobleniye, grokhocheniye, obogashcheniye (Ore preparation: crushing, screening, beneficiation). Ekaterinburg, OOO «UTsAO», 2014, 912 pp.
12. Zhao L., Liu C., Zhao Y., Xie G., Duan C. Numerical simulation of the screening process with an elliptical vibration motion using 3D-DEM. Proceedings of the XXVII International Mineral Processing Congress. Santiago, Chile, Gecamin, 2014, Chap. 16, pp. 76–85.
13. Delaney G. W., Cleary P. W., Hilden M., Morrion R. D. Testing the validity of the spherical DEM model in simulating real granular screening process. Chemical Engineering Science, 2012, Vol. 68, No. 1, pp. 215–226.
14. Zhao L. L., Zhao Y. M., Liu C. S., Li J., Dong H. L. Simulation of the screening process on a circularly vibrating screen using 3D-DEM. Mining Science & Technology, 2011, Vol. 21, No. 5, pp. 677–680.
15. Liu C. S., Zhang S. M., Zhou H. P. Dynamic analysis and simulation of four-axis forced synchronizing banana vibrating screen of variable linear trajectory. Journal of Center South University, 2012, Vol. 19, No. 6, pp. 1530–1536.
16. Belavina O. A., Shvetsov V. A., Adel'shina N. V. Current status of control methods of mineral raw materials powdered samples particle size. Problems and prospects of their solution. Materialy 6 Vserossiyskoy nauchno-prakticheskoy konferentsii «Nauka, obrazovaniye, innovatsii: puti razvitiya» (Proceedings of the 6th All-Russian scientific and practical conf. «Science, education and innovation: development ways»), Petropavlovsk-Kamchatskiy, April 21–24, 2015, pp. 116–122.
17. Mitrofanov S. I., Barskiy L. A., Samygin V. D. Issledovaniye poleznykh iskopayemykh na obogatimost (The study minerals on dressability). Moscow, Nedra, 1974, 352 pp.
18. Vibrotechnic. Catalog. URL: http://vibrotechnic.ru/page/page199.html.
19. REC «Mekhanobr-tekhnika». Production. URL: http://mtspb.com/analizatori_sitovie/asv200.html.
20. WSTyler: URL: http://wstyler.com.