Patent ID: 8381916

Claim:
A rotary aggregate washing and classification system, comprising in combination: a material inlet for receiving material therein; a reservoir containing a fluid therein; at least one tubular screen mesh having at least one screen opening size, and coupled to said material inlet suitably to receive said material therefrom, and passing at least partially through said reservoir, and thereby forming a passage for material smaller than said at least one screen opening size to pass through while material larger than said at least one screen opening size is prevented from passing through, whereby said at least one screen mesh is operative to separate larger material from smaller material; an auger within said at least one screen mesh which is operative to carry said material against the force of gravity through said at least one screen mesh; and a sand classifier within said reservoir receiving said smaller material subsequent to said smaller material passing through said at least one screen mesh into a flow within said fluid, said flow initially transporting said smaller material in entirety and having decreasing velocity subsequent to receiving said smaller material, gravitational forces acting upon said smaller particles to grade said smaller material into at least two receptacles having coarseness increments generally inversely proportional to an amount of time said smaller material is suspended in said flow.