Vibratory Screening and Dewatering

Derrick® Stack Sizer®

The Derrick Stack Sizer is a high capacity, multiple deck, wet screening machine capable of high capacity wet screening in a small footprint. A single slurry input is equally divided in a Derrick flow divider prior to the Stack Sizer.  Each screening deck then makes a particle size separation on the Derrick Polyweb Urethane screen surfaces. The undersized fraction is collected from all decks in a common manifold to a single discharge. The oversize fraction is collected in the large hopper and discharged to a common point.

Derrick® Fines Recovery System

Dewater and recover fines from aggregate and sand processing wastewater WITHOUT the use of expensive polymers or chemicals. With many installations throughout North America, the Derrick® Fines Recovery System is proven successful in the field and continues to lead the way for the aggregate industry.

Applications include:

• Drying and cleaning aggregate – dewatering, desliming, degritting and rinsing
• Sand and sand slurry processing and separation – replacement of sand screws
• Solids recovery from dirty water or wastewater
• Reduction of settling pond sedimentation
• Dewatering of solids from dredging operations
• Frac sand processing and recovery free of clays

Urethane Screen Panels

Derrick MP screen panels are constructed from a special high temperature polyurethane material. They are a direct replacement for the traditional wire mesh panels currently used in the Rotex MegaTex screeners. These panels have a tapered opening to greatly reduce blinding issues commonly experienced with wire mesh panels. Because of the reduced blinding, the screen production rate can be increased over wire mesh panels. Typical life span is greater than 6 months. Urethane screen panel sizes are available for typical frac sand production.

Derrick® Stack Sizer®

The Derrick Stack Sizer is a high capacity, multiple deck, wet screening machine capable of high capacity wet screening in a small footprint. A single slurry input is equally divided in a Derrick flow divider prior to the Stack Sizer.  Each screening deck then makes a particle size separation on the Derrick Poly Web Urethane screen surfaces. The undersized fraction is collected from all decks in a common manifold to a single discharge. The oversize fraction is collected in the large hopper and discharged to a common point.

SUPERSTACK®

The Derrick SuperStack® provides high capacity, high efficiency separation of fine wet particles. The eight screening decks operate in parallel and include a front-to-back tensioning system that increase the screening capacity up to 3 times that of the best fine screens currently available.

HI-G® Dewatering Machine

The Derrick HI-G® Dewatering Machine is designed to maximize fines separation and recovery and provide drying capabilities to a wet screening and dewatering system. Powered by twin electromechanical 2.5 horsepower Super G® vibratory motors, this unit’s rotary speed (1750 RPM) and stroke length (019 in.) combine to create 7.3 G’s of screen surface acceleration. Water and fine solid separation are conducted efficiently, with component parts designed for maintenance-free operation.

HI-Cap™ Shaker

This high-capacity wet screening and dewatering equipment is designed to dewater up to 300 TPH (Tons Per Hour) of primary sand products, delivering high-quality production sands (asphalt, concrete, mason, and others). Each unit houses over 62 square feet of screen surface area, of which nearly half is open area, resulting in an efficient and high-volume dewatering capacity.

Linear Motion Screens

Linear motion screens are designed for solids recovery, dewatering, and dilute slurries with low quantities of oversize. These screens are a versatile addition to a variety of wet screening and dewatering processes and are ideal for compact working spaces, with its low headroom requirements and high screening capacity. They efficiently purify viscous slurries, removing grit and other small-particle contaminants.

The screen frame can be angled from +10° to -15°, with highest fluid capacity when locked into an uphill position. The equipment's linear motion conveys oversize materials out of the pool efficiently, discharging them into a dewatering process area.

Repulp Screen

The Repulp Screen efficiently screens out fines and undersize particles, resulting in clean and consistent oversize material. Spray nozzles are focused upon rubber-lined wash troughs (instead of being focused directly on screen surface), reducing wear and providing evenly distributed fluidization. Vibrating motors feature sealed bearings that are permanently lubricated and require minimal maintenance.

These machines feature multiple stages of screening and repulping, resulting in the highest rate of undersize particle removal possible. Repulp screens can be equipped with a split undersize hopper, allowing for a variety of separation sizes, and cut points.

High Shear Screen

The High Shear Screen effectively processes clay slurries. While traditional wet screening and dewatering machines feature a low plane of incline (resulting in bridging and blockage issues with platy minerals found in clay), High Shear Screens are set to a 45 degree panel angle. The result is a screening solution that can handle difficult slurries and platy minerals.

Multifeed

The Multifeed wet sizing screen is made up of three independent screening machines that provide three times the effective width of a conventional screen, mounted in a single frame and driven by one vibrating motor. The three separate feed streams are divided equally through a flow divider system located on the machine.

Front-to-Back™ Dry Screening Machine

The Front-to-Back (FTB) dry screening machine provides increased screening capacity, improved efficiency, and extremely fast screen panel changes. Customers using the FTB machine report screening capacity increases up to 50% with improved efficiencies in products ranging in size from 0.25 inch (6.35mm) down to 400 mesh (38 µm).

Traditional Dry Screening Machines

These dry screening machines have been in use for over 60 years in the industrial minerals industry. They utilize a true linear motion to achieve higher screening capacities with smaller floor footprints. Screen pellets, powders, sand, crushed glass, coal, and many other types of materials that require fine screening.