kobeshmachine scruber and dryer:

The scrubbing process takes washing one step further. Rinsing may not give the desired cleanliness, especially when dry and other deleterious materials are present, so the process of scrubbing is now the accepted method. Scrubbing works on the principle of working material against material to remove clay and other material from the stone before going to the next stage.
These machines are incorporated where aggregate or similar materials require dirt or clay to be dissolved or liberated. Specifically used in the Sand & Gravel, Limestone & Coal industry.
Where aggregates are heavily contaminated by clays a rotating barrel scrubber can be incorporated into the system to ensure adequate cleaning. The sand product flows with the wash water typically to a Hydro sander where the silt and clay are removed and the sand de-waterered