The hydrosander is used for
dewatering and removing the slit
content from wash sand. The
large diameter bucket wheel,
long fines recovery spiral and
low power requirements enables
these units to be both efficient
and cost-effective.
Each hydrosander has a
contra-flow screw recovery
spiral fitted in the claim are
of the tank. This spiral plays a
very important role when the
product to be processed contains
a high percentage of fine or
lower density particles.
Depending on the waterfowl rate
a certain percentage of bottom
fines can escape first pass
recovery and they are then
influenced by the water flow
along the settlement tank
towards the weir system at the
opposite end. As these fine
particles move along they
gravitate towards the tank
bottom and into contact with the
spiral blades. These influence a
contra-flow system nudging the
escaping fines back into the
recovery buckets. In general the
contra-flow spiral system
maximises efficiency of particle
recovery and overall output.
