Equipment

Dewatering Screens

High-frequency dewatering screens for removing surface moisture from washed coal product and tailings filter cake.

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Overview

What this equipment does

Dewatering screens are high-frequency, flat or slight-upward-angle vibrating screens designed to remove surface moisture from wet coal products. They typically follow rinse screens or thickeners and produce a stackable, conveyable, and saleable product. Dewatering performance depends on screen panel slot geometry, panel angle, vibration G-force, bed depth, and feed water content.

At a Glance
Equipment Type
Dewatering screen
Material Handled
Washed coal, fines, slurry
Capacity Range
20–500 tph per screen
Where used

Common Applications

  • Coal preparation product dewatering
  • Fine coal dewatering after centrifuge
  • Tailings dewatering
Specifications

Technical Specifications

Dewatering Screens
Specification Value Unit
Capacity 20–500 tph
Screen Area 1.5–18 m²
Slot Aperture 0.25–1.0 mm
G-Force 4.5–7 g
Drive Type Linear motion (twin exciter)
Selection guide

Selection Factors

  • Feed solids concentration
  • Required product moisture
  • Feed particle size distribution
  • Available installation space
  • Discharge geometry
Maintenance

Maintenance and Wear Notes

Panel wear and panel slot blinding are the most common issues. Slotted polyurethane panels are typical and are replaced as wear progresses. Exciter and spring condition should be monitored to maintain G-force.

Related Equipment

Vibrating screen

Vibrating Screens

Vibrating screens for sizing, dewatering, and media recovery in coal preparation plants and handling circuits.

50–1,500 tph per deck Raw coal, washed coal, dense medium, slurry
Centrifugal slurry pump

Slurry Pumps

Centrifugal slurry pumps for coal preparation tailings, dense medium circuits, dewatering, and mine water service.

20–4,000 m³/h Coal slurry, tailings, dense medium, mine water with fines
Filter press

Filter Presses

Membrane and plate-and-frame filter presses for dewatering coal preparation tailings and fine slurries.

1–80 m³ filter chamber volume Coal preparation tailings, fine slurries

Related Applications

Equipment for Coal Washing Plants

A structured reference to the equipment used across raw-coal handling, sizing, cleaning, dewatering, and tailings management in coal washing plants.
Frequently Asked

FAQ

How is a dewatering screen different from a sizing screen?

Dewatering screens use a flat or slight upward angle, fine slot apertures, high G-force, and higher vibration frequency. The goal is to drive water through the bed while retaining solids — the opposite of a sizing screen, which is sloped to convey material along the deck while sorting by size.

What product moisture levels are achievable on a dewatering screen?

Coarse coal product can typically be dewatered to 5–8% surface moisture on a dewatering screen, depending on particle size distribution and screen sizing. Fine product typically requires centrifuges or filter presses for lower moistures.

Why is panel slot orientation important?

Slot orientation (perpendicular to flow direction) influences how readily water passes through and how easily fines blind the slot. Wedge-wire and slotted polyurethane panels are designed so that the slot widens away from the working surface, reducing blinding.

Can a dewatering screen replace a filter press?

For coarse coal product, yes. For fine tailings (typically below 0.5 mm), filter presses produce a much lower-moisture cake and are usually required. Dewatering screens and filter presses are complementary in a typical preparation plant.

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