Reed Construction Data

GreyStone Inc.

GreyStone Inc.’s 36-inch Aggre-Dry sand dewatering unit combines a fine material screw and dewatering screen to produce sand and gravel products with moisture content as low as 8 percent to 13 percent by weight, while using 30 horsepower to wash and dewater up to 100 tons-per-hour.

Working as a single unit, Aggre-Dry’s inclined single-spiral fine material washer (FMW) initially dewaters the material, doing the bulk of the work. At the same time, the rotation of the dewatering screw scrubs the material to help remove surface dirt. The action of the screw flights sends the sand up the inclined tub, and ensures that the attached dewatering screen located at the top of the flights will be evenly fed and the vibratory dewatering screen further removes moisture from the sand. This combined process produces a caked, dry sand product that neither an inclined dewatering screw nor vibratory screen can separately achieve, and the unit re-introduces the throughs from the screen back into the screw’s washing process, where the screw again pushes the material to the unit’s dewatering screen, increasing the amount of salable product.

In addition, GreyStone will display its 6-foot by 12-foot Dewatering Screen, and complete 8-foot by 32-foot Classifying Tank.