Chalcopyrite (Cu) Sphalerite (Zn) Separation by FlotationPrimary slimes are washed out ahead of the Jaw Crusher and also in the washing scrubber and trommel. If the ore contains corrosive soluble salts, it is necessary to provide equipment resistant to corrosion. This applies in particular to the trommel screen section and the slime classifier and also the.sphalerite impact crusher,Impact Crusher Working Principle - 911 MetallurgistApr 19, 2018 . Starting from the base working principle that compression is the forcing of two surfaces towards one another to crush the material caught between them. Impact crushing can be of two variations: gravity and dynamic. An example of gravity impact would be dropping a rock onto a steel plate (similar to what.