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These corrections apply both for ball mill and rod mill grinding. Correction factors suggested by Rowland and Kjos that apply for ball mills are given below. Corrections for rod mills are given in Chapter 8. 1. Correction for dry grinding as Bond’s work index is carried out under wet conditions 2.

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the form of Equation 3 . The Jar Mill test favoured by Metso gives a table of results of E and measured size x for a progressive batch grinding test; these results can be fitted as demonstrated in Figure 4. A series of Bond ball mill work index tests run at different closing mesh sizes can be fitted in almost the same way.

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