Relacionar Columnas GRINDING MACHINESVersión en línea Types of Mills por Jhony Guillermo Montesinos Cossio 1 What is a mill? 2 SAG Mill 3 High Pressure Roll Mill 4 Autogenous Mill 5 Rod Mill 6 Ball Mill It is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes. It is an acronym for semi-autogenous grinding that also uses grinding balls like a ball mill.