A device for classifying superfine material from continuously fed granular solids which has a charging chute feeding the material into a washing trough. The washing trough is formed by a conveyor belt, which is mounted on a machine frame. A part of the conveyor belt forms the washing trough downstream of the charging chute. Another part of the conveyor belt is arranged below the charging chute, and is elevated against the direction of flow of the charged material. The charging chute has a false bottom above the washing trough and in the material feed area. The false bottom is adjoined by a gap on the head end of the washing trough. The gap extends over the entire width of the trough. The remaining area of the charging chute is perforated. In another embodiment, a vat is arranged at the end of the washing trough and extends over the entire width and depth of the washing trough. The vat has a flow of liquid passing over it and is filled with spherical elements of different shapes, sizes and surfaces.
The method relates to the recovery of fine sand on floating production equipment in the form of a floating grab-bucket type excavator or floating bucket chain dredger. In this case, the dredged material is dewatered and transported to shore via floating conveyor belts. The dredged material is transferred to dewatering screening machine having a dewatering deck with a dewatering coating. Below the dewatering deck the screening machine has a blind bottom covering the entire surface area, whereby in the direction of conveyance the end zone is provided with a discharge. The discharge is directed at a hydro belt separator, which has a revolving endless conveyor belt with a washing trough as the separation bed, and an ascending part leading away from the washing trough. The running direction of the conveyor belt is in the direction of the ascent, whereby the dredged material is transferred at the discharge of the screening machine to the washing trough of the hydro belt separator.
