AMIT 135 Lesson 7 Ball Mills Circuits Mill liners [image 135 7 4 ] Mill liner installation [image 135 7 5 ] Magnetic mill liners [image 135 7 6 ] Mill Lifters The number of lifters generally can be determined by the rule of thumb Number of Lifters = 3nD for double wave liners = for single wave liners where D is the mill diameter m Double wave liners are more suitable for ball sizes less than 60 mm Otherwise