In many operations the use of less electrochemically reactive grinding media in the first grinding stage (for example, rod milling and high aspect ratio SAG milling) is rarely
considered. Therefore, in reality a plant may inadvertently be using a “mixed” media charge. That is, whilst employing inert grinding media during secondary grinding, electrochemically active forged steel grinding media may be used in the primary grinding stage.
C.J. Greet and C. Bartle