Full definition
Longitudinal bar (metal or rubber-metal composite) installed on the inner shell of a ball or SAG mill to lift the charge (balls + ore) and create the cascading/cataracting action needed for impact grinding. Profile height, angle and spacing determine the charge trajectory and milling efficiency. Rubber-metal lifters (Metso Poly-Met, Weir Linatex) reduce noise 10–15 dB and last 2× longer than steel in most applications.