Impact Crushers

In these types of crushers, high-velocity impacts are used to break rocks. They work either by hitting rocks with a high-speed hammer (hammer mills) or throwing rocks against each other or against a steel plate (Barmac crusher). Breakage by impact was the

Impact Crushers

FIGURE 5.17 Material flows through the crushing chamber of a cone crusher (SME-AIME 1985)

concept behind the Hadsel autogenous mill, discussed later, but in most cases breakage by impact did not work well in the Hadsel mill because the rock velocities were not high enough for them to be broken to small particles. It was eventually realized that shatter­ing coarse rocks by impact in an autogenous mill was the opposite of what was needed. To prevent the mill from being filled with pebbles too large to be discharged from the mill, slow breakage of the coarse rock by abrasion with the finer ore being broken by impact by the coarse rocks was necessary. When impact breakage is required, it can be achieved and controlled in impact crushers.

Updated: 24.03.2016 — 12:06