Dewatering Screens: How They Work and Why They’re Needed for Quarry Operations

January 22, 2023

Dewatering screens are utilised primarily for the desliming, dewatering, and medium removal processes. Dewatering screens were originally designed to remove excess water from the sand. Still, they are used in virtually every sector, including the recovery of slime in coal preparation plants and the dry discharge of tailing in beneficiation plants, amongst other applications.

The moisture in the fine material may be “squeezed out” using dewatering screens, which then makes the material appropriate for shipment. In most cases, the dewatering screens will be able to remove 85 per cent of the moisture that is present in the material. Sand, gravel, crushed stone, industrial sand, mineral sand, frac sand, iron ore, coal, and other granular materials are some examples of granular materials.

How Dewatering Screens Work

Dewatering screens are often built to have a specified inclination angle with the horizontal direction to accomplish an effective dewatering effect. This is done so that the screens can drain water more effectively.

The slurry is distributed over the inclined and liquefied screen panels during operation. The counter-rotating vibrating motor (also known as an exciter) travels linearly at a particular angle with the screen surface, and the solid in the mud flows upward and forwards as a result of this movement. During the vibration, the water and the solid are separated; the solid is then discharged via the outlet of the screen plate, and the water is allowed to enter the water tank through the screen meshes.

A filter layer is developed when a deep bed is formed between the uphill screen and the discharge due to the accumulation of solid material on the upwardly inclined screen panels. The filter layer acts as a medium for filtration, collecting dust and other minute particles while letting water flow through the perforations in the screen.

Choosing the Right Dewatering Screens

At this point, the most cost-effective piece of machinery available for extracting water from sand is the dewatering screen. Compared to other equipment with the same capacity, the dewatering screen has a lower overall power need and fewer moving parts that might wear out over time.

The dewatering screen is an excellent choice for use in the wash plant, the fines recovery plant, and any other location where finer and drier materials need to be collected. Dewatering screen media may be modified to produce sizing cuts, which enables the dewatering screen to process fine aggregates ranging from -4 to 400 mesh and obtain dry products with moisture contents ranging from 8% to 20%.

Taking Into Consideration The Nature Of Materials

The elements of solid-liquid morphology, particle size, humidity, viscosity, bulk-specific gravity, and other features are the primary contributors to the properties of materials. The materials have particular features, such as high temperature, corrosion, static electricity, etc., since various materials require different kinds of dewatering screens or whether the materials have special properties.

Screening Purpose

A straight-line dewatering screen is an option for coarse screening, while the rotary dewatering screen, ultrasonic dewatering screen, and ultrasonic dewatering screen are options for fine screening.

Treatment Capacity

Depending on the demands placed on the capacity of the material handling system, select from among many distinct types of dewatering screens.

Time Spent at Work

The model, the material, and the technical characteristics of the dewatering screen will all change depending on whether the screen constantly operates for a long time or occasionally.

Talking to a trained dewatering screen manufacturer like the ones we have here at Hawk Machinery is the quickest and easiest way to acquire the appropriate dewatering screens for your needs. We can advise you on the type of dewatering screen that will work best with your materials.

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