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Dewatering Screens

dewatering screen for sand and ash from boiler

Dewatering screens, or wet screens, provide a wide range of sizing and classification tasks. Wet screens efficiently screen out fines and classify oversize particles. All Derrick machine dewatering units have a proven throughput of up to 300 tons per hour and are designed to maximize solids recovery and minimize wastewater.

View ( 14 ) Case Studies about Dewatering Screens Below

The Derrick machines provide a high capacity, high efficiency separation of fine wet particles. The multiple screen deck surfaces increase screening capacity by up to 3 times that of the best fine mesh screens currently available. The Hi-G dewatering screen provides 7.3 G's of screen surface acceleration for maximum water and fine solids separation.

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Efficient Frac Sand Screening

A sand producer was looking to increase production rates at an existing plant by adding new frac sand screening equipment. Their goal was to produce a consistent 40 x 70 API standard product.  The feed to the vibratory screening machines would be from a processed material stream that discharges from a hydrocyclone at a solid feed rate of 150 STPH.

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fine screening and dewatering for mineral processing

Multiple 5 Deck Derrick® Stack Sizer® Installations

The patented, high-volume Derrick® Stack Sizer® provides a much better economic alternative to Hydrocyclone separators, hydraulic classifiers, and less efficient low volume fine screening systems.

Over 300 of the Stack Sizer units have been sold throughout the world for fine screening and dewatering applications that require high tonnage mineral processing.

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Integrated dewatering system with double roll crusher

Integrated dewatering system with double roll crusher

This continuous and automatic dewatering system turns wet petroleum coke slurry and sludge into dry solids that can be stacked or conveyed easily.  The system requires little or no maintenance and is not affected by the amount of water in the solids.  It can be stationary or mounted on tracks and rails.

This type of dewatering system fits most coking applications.  It can also be used for other types of bulk solids that require industrial scale drying before loading onto rail cars, trucks, barges, or ground storage.  It uses the principle of two-mass, natural frequency, sub-resonant magnification.  This means that a small exciting force acts upon a coil spring amplification system to alternately store and release energy and move material in a shuffling motion.

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A waste wood power boiler uses a wet scrubber to remove ash from the boiler system. The water containing unburned carbon (char) and sand with grit is then pumped at a rate of 2,300 GPM to vibratory dewatering screens. The urethane screen panels remove the char and most of the sand and grit from the water. These solids are then moved by conveyor or front end loader to the wood yard. The water is sent to the clarifier system for further solids removal. The unburned carbon is re-injected into the boiler as fuel.

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Dewatering Ash & Sand from Boiler Water

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Boiler Ash Handling & Recovery System

Final dewatered ash, or char, being fed off the dewatering screen

This boiler ash handling and recovery system is designed to remove unburned carbon (char), ash, grit, and sand from wastewater discharged from a wood and bark power boiler. Slurry, composed of water and solids, is sent from the wet precipitator to the dewatering screen at rates of 800 to 2,200 GPM. The HI-G dewatering screen uses (2) low horsepower, industrial vibration motors to apply a high G-force on the urethane screen panels.  This separates the water from the solids.

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fluid bed dryers

Fluid bed dryer for pre-crushed pumice

This vibrating fluid bed dryer is used to remove the surface and internal moisture from pre-crushed pumice. The ore enters the system via a belt conveyor and feeds the dryer. Air heated by natural gas is processed through the fluid bed dryer, removing the moisture.  Moisture laden gas is sent to a dust collector to remove any entrained fines before the gas is released into the atmosphere.  The dried ore is then discharged from the dryer onto a conveyor and sent to a storage silo.

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