The article is devoted to practical application of loose material vibratory separation effect for particle size classification. A possibility for separation of segregated material layers by placing a stepshaped slotted opening across its flow has been considered. Crushed stone production screenings were used in the experiments as starting material, that may be used in concrete production, limited by a certain content of minus 0.16 mm size fraction. Starting material differential characteristic consisted in significant content of clay particles in this size fraction, accounting for 50 % by mass. Effects of vibration parameters, device throughput rate and slotted opening dimensions upon classification process efficiency were estimated. Efficiency and recovery parameters were determined with respect to process conditions. It is noted, that application of vibratory separation device with step-shaped slotted discharge opening is more effective, if compared with previously considered device equipped with cutoff plate. Besides, in comparison with conventional vibratory screens, vibratory segregation classifier uses vibration of comparatively low intensity — acceleration amplitude is about 1.5 g. (Conventional vibratory screens — 3–5 g). As a result, vibratory classifier demands much less power inputs. The device is simple, and, apparently will have a longer service life in comparison with screening media. The device efficiency may be increased by increasing the number of slotted openings and varying their size. In-line arrangement of slotted openings along chute length will provide for loose material classification into several size fractions. Computer simulation of the process was performed using EDEM software complex. That method proved its effectiveness in simulation and visualization of the considered process of loose material classification, and may be used for prediction of studied processes' results, among other things, permitting to significantly decrease the scope of experimental studies.

1. Arsentyev V. A., Blekhman I. I., Blekhman L. I., Vasilkov V. B., Feoktistov A. Yu., Yakimova K. S. Obogashchenie Rud, 2010, No 5, pp. 13–16.
2. Pat. 2407600 Russian Federation, IPC⁶ B 07 B 001/40, B 07 B 013/00, 2010.
3. Bortnikov A. V., Vasilkov V. B., Romashov A. O., Samukov A. D. Obogashchenie Rud, 2011, No 4, pp. 33–36.
4. Vibratsii v tekhnike. Spravochnik (Vibrations in engineering. Reference book), Vol. 4, Moscow, Mashinostroyeniye, 1978–1981, 509 p.