... :a. The medium and fine sand are washed away less. The washed construction sand's gradation and modulus of fineness ... get the standard which is regulated in national ' construction sand' and ' construction scree and gravel'.b. There is almost no wearing ... Table, Spiral Classifier, Thickener, Filter, Drier, Rotary Kiln, Sand Washer, Sand Production Line, Metal Processing Equipment, etc. Elva Wu/ Sales ...