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GreyStone Inc.

Address 3330 E. 23rd Street, P.O. Box 904, Columbus, NE, 68602, US
Phone 402-564-9505
Fax 402-564-6694
Email [email protected]
Website greystoneinc.com

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GreyStone’s New Portable Dewatering Screen Keeps Moisture As Low As 7-12%

The Portable Aggre-Dry Dewatering Screen from Columbus-based GreyStone, Inc., features a patented flume, allowing an operation 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, along with a caked, dry sand product that an inclined dewatering screw alone cannot not achieve. Wheel-mounted for easy transportation, this 5-ft x 10-ft dewatering screen is ready to connect to a washing screw for on-demand production.

Material on the move

For operations on the move, GreyStone manufactures compact stackable field conveyor systems. With idlers nested below the conveyor top cords, GreyStone field conveyors easily stack on trailers for quick transport. Standard-duty portable conveyors come in 50- and 60-foot lengths. With belt widths of 24, 30, 36 and 42 inches, they offer material flow capacities from 300 to 1,050 tph. GreyStone’s heavy-duty portable radial stackers can be designed with 100-, 110- and 120-foot lengths and 24-, 30-, 36-, 42- and 48-inch belt widths. Heavy-duty series conveyors are capable of carrying up to 1,300 tph. All portable radial stackers more than 60 feet long feature a 20-foot sectional-fold design, where one end of the 80-foot conveyor or both top and bottom ends of longer portable conveyors fold, reducing overall length for travel.

Self-erecting screen tower

GreyStone has a new, fully portable, Self-Erecting Screen Tower for sand, gravel and aggregate producers who move classifying equipment from site to site at least once a year. The screen tower, which uses a horizontal, vibrating, three-deck wet screen, is a more cost-effective and flexible alternative to permanent and stackable screen supports. It eliminates costs and production losses due to inactivity of some permanent screens, and assembly and take down time for stackable screen supports. It takes less than two days to tear down and set up, and can easily be moved by semi-tractor, allowing producers with a portable classification tank to utilize a completely portable classifying system. It can act as a primary screen for operations that screen six-inch minus material or as a secondary or tertiary screen for plants that screen larger material. Fed by either a dredge or conveyor, it feeds material 3/16-inch minus into a classifying tank and stockpiles up to three material sizes from the three decks for further processing.

Sand dewatering unit uses minimal power

GreyStone will be introducing the Aggre-Dry FMW Screen. The 36-inch Aggre-Dry sand dewatering unit combines a fine material screw and dewatering screen to produce sand and gravel products with a moisture content as low as 8 to 13 percent, by weight, while using only 30 hp to wash and dewater up to 100 tph. Working as a single unit, the Aggre-Dry's inclined single-spiral fine material washer (FMW) initially dewaters the material. 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. The vibratory dewatering screen further removes moisture from the sand. Finally, in its most innovative feature, this GreyStone 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.