Screening for Top Production
Only requires 10 horsepower
The C56 HI-Capacity Dewatering Screen from Derrick Corp. has a screen bed G-force of 8.0, and when paired with the company’s patented high open-area urethane, incoming feeds such as concrete sand, asphalt sands, and mason sands are dewatered to more than 90 percent solids by weight, according to the manufacturer. The single 5 by 15 unit can handle 300 tons per hour and only requires 10 horsepower from a power supply to operate. Small footprint and room requirements make for easy installation and operation of the unit.
Ideal for dry-screening applications
The Dur-X-LiveWire polywire, slotted-wire screen media from Durex Products, Inc. is designed to boost production by eliminating blinding and plugging problems, while providing longer wear life. Available in the company’s proprietary Xtreme high-tensile tempered or stainless steel wire, the screen media is ideal in dry screening applications where materials contain high-moisture content and a high proportion of fines. The screen’s high-strength wires are held in place by molded rubber strips that provide longer wear life and great open area, according to the company. The 60-durometer rubber strips allow optimal flexing action required to keep screen openings clear. The rubber-molded strips are particularly ideal in hot and humid environments.
The screen media is available in the following four slot-type openings: diamond-shaped; Dur-X-Accuslot (alternating “Z” and straight wires that form triangular-shaped openings); herringbone; and straight-wire slot openings (long slot screens that have parallel wires). An optional lap design is available that permits screen replacements without having to adjust adjacent screens. Screens are available with openings up to 2 inches and wire sizes up to 0.250 inches and with overall screen sizes up to 72 inches long by virtually any clamping width.
Triple-deck screen plant
Extec’s largest model in its S-Series, the S-7, features the same double-screen design as the smaller units in the series, but boasts a triple-deck configuration as well as an additional side conveyor. Along with a large feed hopper with optional double-deck vibrating grid and a set of extended conveyors, these features are said to make the S-7 the most productive mobile screen in its class. With a transport weight of 85,142 pounds, the unit is powered by a Deutz BF4M 2012 diesel engine with 74.9 horsepower that meets or exceeds all known emission regulations. It is carried on a large, durable chassis that provides enhanced strength and rigidity while a self-loading hydraulic bogie provides an independent transport capability without the need for low loaders.
Virtually eliminates pegging, blinding
Major Wire’s Flex-Thane combines the company’s Flex-Mat technology with the installation of polyurethane and rubber panels to “virtually eliminate blinding and pegging problems on flat-surface screen decks,” according to the company. The product’s independently vibrating wires, bonded in place with polyurethane strips, provide more open area for greater throughput, higher production, and better efficiency than polyurethane and rubber screens in hard-to-screen applications. The modular panels can be easily installed on most common flat-surface screen decks, similar to traditional polyurethane and rubber panels. The product is available in 1- by 1-foot and 1- by 4-foot panel sizes, as well as metric and mixed dimensions, with a variety of locking systems to fit virtually any flat-surface polyurethane screen deck. It also can be custom-made in 1- by 2-foot and 1- by 3-foot sizes.
Screen stringer system
Polydeck Screen Corp. will debut its PipeTop II Stringer System at ConExpo-Con/Agg, a new design that maximizes versatility from a single frame. Available in three forms — bundled rails for a new screen deck, jigged conversions for changing out an existing frame, or a complete screen deck frame to retrofit an older shaker — PipeTop II is said to offer a variety of production benefits. Its 1/2-inch rails, when coupled with Polydeck’s Maxi screen panel designs, provide high open area that may match wire cloth in many cases. It also offers multiple fastening options from a single frame including PolySnap and traditional pin-style versions. The fastener heads are polyurethane and screw into steel ferrules on the frame rails. If a fastener head becomes worn, it can be removed and replaced individually rather than replacing an entire frame. For applications requiring a changeover to wire cloth, crown adapters fit both fastener head types and offer the ability to change between screen media with a minimal investment of time and money.
Eliminates need for slurry pond
Phoenix Process Equipment Co. has expanded the range of hydrocyclone options in its HG Separator line for aggregate wash plants. The mechanical separation system combines hydrocyclones with dewatering screen technology to produce a dewatered, marketable, solid-phase product from previously discarded fines slurry without using chemical flocculants or coagulants. The slurry is pumped into the hydrocyclone portion of the separator to recover target fines. The hydrocyclone underflow containing the captured fines then reports to a high-frequency dewatering screen, where vibratory forces dewater and convey the recovered material. The underflow from the screen is re-circulated to the hydrocyclones to eliminate loss of recoverable fines. For complete slurry pond elimination, the hydrocyclone overflow reports to a high-rate thickener and belt filter press.
The company now offers high-efficiency units that are said to produce sharper, finer separations throughout a wide range of capacities. According to the company, the separator can reduce slurry pond cleaning costs and create a potentially marketable product, and it can be upgraded to a complete fines dewatering system, which eliminates the need for a slurry pond.
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