GreyStone Inc., based in Columbus, Neb., offers three models of dewatering screens — the DS-488 (4-ft. by 8-ft. [1.2 by 2.4 m]), DS-6010 (5-ft. x 10-ft. [1.5 by 3 m]) and DS-7212 (6-ft. x 12-ft. [1.8 by 3.6 m]) — to handle a variety of capacities and efficiently dewater up to 300 tons (272 t) per hour. With GreyStone’s dewatering screen, the days of air drying are gone. Many concrete and masonry sands typically retain from 18 to 24 percent moisture, which requires drying time in the pile. At process end, the GreyStone dewatering screen cuts that moisture down to as low as 10 percent — providing salable material in less than a day, according to the manufacturer.

As each unit receives a high percentage of water-saturated fine material, it produces a dense, compact cake that rides up the belt and forms a pile with no runoff or water pools. This provides a dry, transportable product that can be sold in a short period of time. And, eliminating water runoff from material piles can help many producers answer local environmental concerns.

GreyStone’s high-frequency separator allows producers to easily adjust bed depth, table tilt and vibrator variables in order to remove up to 50 percent of the water from material, while maintaining maximum production, no matter how wet the material is. One of the greatest benefits of this dewatering screen is its ability to adapt to each plant’s unique material by combining the adjustable motor force in conjunction with the adjustable bed tilt. Once setup is achieved with favorable steady-state conditions, operation is as simple as starting the motors with the flip of a switch, and letting the screen do its job, according to the manufacturer.

The GreyStone dewatering screen utilizes two vibrators that initiate a linear motion, driving particles in an uphill, downhill or horizontal direction — so water is strained down through the sand bed and below the screen deck. The urethane deck, with a 1/4-mm aperture, allows the user to dewater a broad range of particle sizes. The deck can handle up to 14 in. (35.5 cm) of material depth, making use of the bottom thin layer of material as a secondary “screen,” allowing the deck to preserve fines smaller than 200 mesh. All of GreyStone’s dewatering screen models are constructed of ASTM A36 structural steel for years of trouble-free service life.

For more information, call 888/346-WASH (9274) or visit www.greystoneinc.com.

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