Fine Material Screw Washer (Sand Screw Washer)

The fine material screw washer scrubs soil, dust and clay-silt off sand with rotating spirals at 0-50 mm feed and 50-250 tph. Single and twin models (GNR 400-1000), CE and ISO 9001 certified; discharge moisture 15-30%, down to 8-20% with dewatering. The fine material screw washer (sand screw washer) is a washing unit that scrubs sand carrying soil, dust and foreign particles with rotating spirals (screws). It accepts 0-50 mm feed and runs at 50-250 tph. General Machinery builds its screw washers to CE and ISO 9001 certification. How it works A screw rotates inside an inclined tub, scrubbing fine sand along the tub floor toward the discharge end while light water carrying clay and silt overflows at the top. Water demand is of the order of ~190 L/min per tph of silt; screw speed is set by the proportion of fine material. Moisture and the dewatering chain Screw-washer discharge moisture is typically 15-30%. For a drier, directly stockpilable product the chain is extended: screw washer → hydrocyclone → dewatering screen brings moisture down to 8-20%. The hydrocyclone recovers fine sand around d50 ~45-150 µm (target ~150 µm in aggregate). Clay is measured by Methylene Blue Value (MBV) or Sand Equivalent (SE). Where it fits Applications: river and quarry sand-and-gravel, fine scrubbing of ore, clean aggregate for concrete batching and sand recovery. This machine excels at scrubbing fine sand (0-50 mm) carrying a light clay load; when the feed is low-clay and water saving comes first, move to the bucket wheel, and when coarse stone or heavy plastic clay is involved, move to the log-shaft washer. Turnkey washing line General Machinery combines the screw washer with the hydrocyclone-dewatering group, GNR YM washing-screening plants and a concrete batching plant in one project; crushing, screening and washing are engineered under one roof. A single point of contact, a matched spare-parts chain and on-site commissioning support come together. S: What does the fine material screw washer clean? C: It cleans soil, dust and clay-silt off sand. The rotating spiral scrubs the fine sand and overflows the clay- and silt-laden water at the top. S: What is its capacity and feed size? C: Capacity is 50-250 tph and feed size 0-50 mm. Single models are economical; twin models give higher capacity and better scrubbing. S: What is the discharge moisture? C: Screw-washer discharge moisture is typically 15-30%. Adding a hydrocyclone and dewatering screen brings it down to 8-20%. S: What is the difference between single and twin screw washers? C: A twin screw washer uses two spirals for higher capacity and better scrubbing; the single screw washer is for economical applications. S: Is it certified? C: Yes. General Machinery builds its screw washers to CE and ISO 9001 certification.