TY JOUR TI EXPERIMENTAL STUDIES OF THE PROCESS OF GRAIN PURIFICATION FROM IMPURITIES IN A PNEUMATIC SEPARATOR OF A PNEUMATIC HAMMER CRUSHER KW pneumatic hammer crusher KW pneumatic separator KW auger KW screw turn pitch KW mineral impurities KW metal magnetic impurities KW mathematical model KW rational parameters KW operating modes of the pneumatic separator JO Vestnik of Omsk SAU AU GOLIKOV, A.I. AU MEZENOV, A.A. AU GOLIKOVA, A.A. PY 2025 IS 57 PB FSBEI HE Omsk SAU