The Evolution of Crushing and Grinding: Changes in the ...
Jul 01, 2010· Autogenous Crushing. Autogenous impact crushers of the Barmac type have advantages in energy efficiency and reduction ratios and can handle abrasive ores such as Banded Iron Formation (BIF) in a pebble crushing duty. The breakage mechanism is one of rock impact against rock, so wear rates of metal components are greatly reduced.