Conical screen separator

A screen separator comprising a frustoconical screen having a perforated surface, the longitudinal axis of said screen being inclined from the horizontal so that the undersurface of the screen lies in an essentially horizontal plane, means for rotating said screen, means for introducing materials to be separated into the larger end of said screen, means at the smaller end of said screen for receiving residual materials discharged from the smaller end of said screen, a recovery tank underlying said screen for receiving separated materials passed through the perforations in said screen, means dividing said screen internally into at least three zones, the first zone comprising a dewatering zone at the larger end of said screen, the second comprising a washing zone adjacent said first zone, and the third comprising a dewatering zone at the smaller end of said screen, shower means overlying said screen throughout the lengths of said first and second zones only, and internal baffle means extending longitudinally from the smaller end of said first zone to the larger end of said third zone, said baffles lying in close proximity to, but spaced from the inner surface of said screen.