Operative parameters of the different experiments. L is the internal mill length D is the internal mill diameter J R is the fraction of the mill volume occupied by the bulk rock charge and J B is the fraction of the mill volume occupied by the bulk ball charge. Parameters Unit L 0.48 m D 0.23 m N balls 300 J B 53.14% J R 22.21% Planetary ball-mill DI water 500 rpm, 1040 hI D /I G increases with milling time 27 DBM Planetary ball-mill, ZrO 2 ball NaCl 350 rpm, 2 h, 0.4 MPa ArMLG flakes, 50 200 nm 2 30 DBM Planetary ball-mill, ZrO 2 ball Na 2 SO 4, 100 rpm, 30 min, airI G /I D 2.431 DBM Stainless steel jar (300 mL)Na 2 SO 4, 150 rpm, 24 h (Na 2 SO ...