TY JOUR TI SEPARATION OF BULK MATERIALS IN A CROSS-FLOW CLASSIFIER WITH A LOUVERED GRID KW bulk materials KW sand KW particle size distribution KW separation cut point and efficiency KW fractional separation curve JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Barakovskikh, D.S. AU Shishkin, A.S. AU Shishkin, S.F. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov