The portable Aggre-Dry dewatering screen from GreyStone Inc. features a flume, allowing operations to retain all of the fines discharged from the dewatering screw. The addition of the flume offers a flexible and cost-efficient solution for controlling, recycling and saving water and fines while producing sand and gravel products with a moisture content as low as 7 to 12 percent, the company says. A caked, dry sand product can also be produced that an inclined dewatering screw alone cannot not achieve, Greystone adds.
The 5-ft. x 10-ft. dewatering screen is wheel mounted and ready to connect to a washing screw for on-demand production. According to Greystone, the Aggre-Dry has several unique features, including a 0.25-mm screen opening, which reduces the amount of material that can fall through the screen. The feed from the screw allows the material to build to a bed depth of up to 14 in. on the screen, squeezing additional moisture from the sand as the vibratory motors move it along the length of the screen deck. This further reduces moisture content. There are screen panels on the sides of the Aggre-Dry, as well, that allow for even more water to be removed from the material.