A mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting Such comminution is an important unit operation in many process There are many different types of mills and many types of materials processed in them Historically mills were powered by hand (eg, via a hand crank), working , Rod mills are less common than ball mills for grinding minerals.
The FC Bond Ball Mill is a small universal laboratory mill used in calculating the grindability of all , lhe work requircd is proportioDal to the rcdultioo in volume of tbe pa icles , principle, with tbe energy register equal to the total spciffc energy input , oe* rod mill fe€d passcs, and Pr is thc oFning of the sievc siz lestcd in.