DEAR EXPERTS 

PLEASE TELL ME HOW TO CALCULATE THE GRINDING EFFICIENCY OF A CLOSED CKT & OPEN CKT BALL MILL.

IN LITERATURES IT IS WRITTEN THAT THE GRINDING EFFICIENCY OF BALL MILL IS VERY LESS [LESS THAN 10%].

PLEASE EXPALIN IN A N EXCEL SHEET TO CALCUALTE THE SAME.

THANKS

SIDHANT