... factory,worksite of building and concrete dam to wash,classifying and de-watering various sands.This sand washer adopt inclination of 15', under the ... tub,three weir plates form the sediment pool.The screw head is immersed in this pool, and the screw is driven by electric ... machine is 15° tilted layout; The spiral is driven by motor and decelerator to continuously rotate, and the sand or small ores can ...