TY JOUR TI INFLUENCE OF POROUSNESS OF GRINDING MEDIA OF A BALL DRUM ON DISPERSE CHARACTERISTICS OF CLINKER KW ball drum KW clinker grinding KW grinding media KW particle size distribution KW porousness JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Borisov, I.N. AU Stronin, A.A. AU Klassen, V.K. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov