~The Hydrascrew 100 has three related functions: washing, dewatering, and classification.
? Washing is the primary function and is accomplished by the continuous rotation of the conveyor
shaft and the velocity of the overflowing waste water acting on the feed material. The rotating shaft
causes the feed material to roll and tumble, which in turn provides particle on particle attrition. This
action allows deleterious coatings to be removed from the sand product and discharged with the
overflowing waste water.
? De-watering is the secondary function and is achieved by conveying the product up an inclined
tub to allow the free water to drain from the material. This is accomplished with the use of a closeclearance
curved plate on one side of the conveyor shaft and a drainage trough on the other side.
Water is allowed to drain from the product as spiralled shaft augers material up the inclined curved
plate. This process results in a drier final product that allows for more saleable product and less
water!!
? Classification is the third function and is achieved by adjusting the volume of water over the
adjustable-height weirs. For maximum material retention, the washer's three adjustable weirs are
set level to provide a low overflow velocity.