Combined screw, dewatering screen reduces moisture content

The Aggre-Dry washer combines a fine material screw and dewatering screen. A standard GreyStone 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 the dewatering screen located at the top of the flights will be evenly fed. 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 a vibratory screen can separately achieve.

The GreyStone dewatering screen, curved around the spiral flights on the Aggre-Dry FMW screen, has several unique features. A 0.25mm screen inlet 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 14? on the screen, squeezing additional moisture from the sand as the vibratory motors move it along the length of the screen cloth, further reducing moisture content.

In its most innovative feature, the GreyStone unit reintroduces the throughs from the screen back into the screw?s washing process, where the screw portion of the unit again pushes it to the unit?s dewatering screen, increasing the amount of saleable product.

{{image2-a:r-w:300}}This process eliminates the need for costly pumps and cyclone sand separation systems, along with the additional kilowatts this equipment requires. In fact, the Aggre-Dry FMW screen should use less than half of the kilowatts required to process the same tonnage of spec product on a traditional screen/cyclone system.

In addition, GreyStone has increased the water handling capacity of these units, making the Aggre-Dry even more versatile for aggregate producers. GreyStone offers the Aggre-Dry in sizes to handle production of 100, 200, 300 and 400 tph.

In addition to the Aggre-Dry washer, GreyStone manufactures a complete line of portable and semi-portable washing/screening plants, sand classification tanks and systems, single and twin fine material dewatering screws, single and twin coarse material washers, log washers, water clarifiers, rotary and vibrating screens, portable conveyors and radial stackers, dewatering screens and aggregate reclaiming systems.

In Australia, Rivergum Industries, which specialises in sand washing and aggregate washing equipment and dredging for sand operations, is answering inquiries about GreyStone washing equipment. ?

Source: GreyStone

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