Determining the rational operating parameters for granite crushing to obtain cubiform crushed stone

Purpose. Determining the rational operating parameters for granite crushing under impact in field of centrifugal forces to obtain cubiform crushed stone. In order achieve purpose set, task is determine obtaining main grain-size classes: -50.0 + 20.0; -40.0 -20.0 10.0; -10.0 5.0 and mm. Methods. The process stone studied conditions Kolomoievskyi Granite Quarry, Dnipropetrovsk region. with an initial 100.0-0.0 mm strength grade M1400 subjected crushing. accelerating rotor rotation frequency design value n = 200-1200 min-1. Fine performed a centrifugal-impact crusher by free forces. Findings. optimal speed modes operation, which provide production high-quality maximum content 90-95% fractions, have been substantiated. Originality. yield dependences obtained depending on mode operation. Practical implications. classes from determined: particular, it has determined that 20.0 grain-size, reasonable 400-500 min-1 (the material departure 45-50 m/sec); 200 (25 10.0 – 600-650 (70-80 m/sec), respectively. fractions class 95%, achieved at 650-700 (departure 75-80 m/sec). 94-95%, within 700-800 70-80 data make possible practically choose centri-fugal-impact operation