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Sand Screw

From RitchieWiki

Construction Equipment

A sand screw is a means to dewater sand and remove the finest particles at the same time. Basically it is a tub into which sand and water are introduced, the heavier sand particles settle to the bottom where they are lifted out a screw elevator and dewatered enough to be moved to a stockpile while the extremely fine (silt) particles are washed over the rear (weir) while still suspended in the water. Silt has no structural value in the sand, by controlling water volume, turbulence, rising currents, screw speed and other variables the operator is able to influence the final gradation of the sand. Limiting factors can be the tonnage of the sand or frequently the water holding capability of the tub.