How does a dewatering machine work?

Various types of dehydrators are used in mines and coal washing plants to remove water from materials such as slurry, ore, or coal. The choice of dehydrator depends on factors such as the characteristics of the material, the required moisture content, and the scale of the operation. Here are some common types of dehydrators and a brief overview of how they work:

  • Centrifuges:

How they work: Centrifuges use centrifugal force to separate solids from liquids. The material is fed into a rotating drum, and the centrifugal force causes the heavier solids to move outward and settle on the drum’s wall. The separated liquid is then discharged, leaving behind dewatered solids.


  • High capacity and efficiency.
  • Effective for fine coal particles.
  • Continuous operation.
  • Can handle a wide range of particle sizes.
  • Filter Presses:

How they work: In a filter press, a slurry is pumped into a series of chambers formed by filter plates and frames. Pressure is applied to force the water through the filter medium, leaving the solids behind as a filter cake. The Dewatering Screen material can then be removed from the press.


  • Produces a dry filter cake.
  • Suitable for a variety of materials.
  • Can handle high solids content.
  • Belt Filters:

How they work: Belt filters consist of a continuous, porous belt that passes over rollers. The slurry is applied to the belt, and as it moves, water drains through the belt, leaving behind a dewatered product. The belt is then washed for further dewatering.


  • Continuous operation.
  • Suitable for various particle sizes.
  • Effective for high solids content.
  • Vacuum Filters:

How they work: Vacuum filters use a pressure differential to draw water through a filter medium. The material is applied to the filter, and a vacuum is created on the other side of the medium, pulling water through and leaving behind dewatered solids


  • Effective for fine particles.
  • Continuous operation.
  • Can handle high solids content.
  • Thickeners:

How they work: Thickeners increase the concentration of solids in a slurry by settling suspended particles. The slurry is fed into a central feed well, and the solids settle at the bottom. The clarified water is then removed from the top, while the thickened slurry is discharged from the bottom.


  • Simplicity and ease of operation.
  • Effective for large-scale operations.
  • Suitable for various particle sizes.
  • Decanter Centrifuges:

How they work: Decanter centrifuges are specifically designed for continuous separation and dewatering of solids from liquids. The material is fed into a rotating bowl, and a helical screw inside the bowl conveys the solids toward the discharge end. The dewatered solids are then discharged, and the separated liquid is collected.


  • Continuous operation.
  • Suitable for various materials.
  • Can handle high solids content.
  • Screw Presses:

How they work: Screw presses use a rotating screw within a cylindrical cage to apply pressure to a material. The pressure squeezes out the water, and the dewatered material is discharged. Screw presses are often used for sludges and slurries.

  • Drying Beds:

How they work: Drying beds involve spreading the material in a thin layer on a large surface area, allowing natural evaporation and drainage. The dewatered material is left to air-dry, and the water is removed through a combination of evaporation and drainage.


  • Simple and low-cost method.
  • Suitable for large-scale operations.
  • Can handle a variety of materials.
  • Evaporators:

How they work: Evaporators use heat to vaporize water from a liquid, leaving behind a more concentrated solution. While less common in mining, evaporators can be used for specific applications where concentrated solutions are desired.

Aury is a company known for manufacturing equipment for the coal, metallurgical, and mineral processing industries. While specific details about Aury’s centrifuges may evolve over time, here are some potential advantages commonly associated with the use of centrifuges in coal washing plants, based on general industry principles:

1.High Efficiency Dewatering:

Centrifuges are known for their high dewatering efficiency. They use centrifugal force to separate solid particles from liquids, allowing for effective moisture removal from coal.

2.Consistent Performance:

Well-designed centrifuges, such as those manufactured by Aury, can provide consistent and reliable performance. This is crucial for maintaining the quality and consistency of the dewatered coal product.

3.Adjustable Parameters:

Many centrifuges offer adjustable operating parameters, allowing operators to optimize the dewatering process based on the characteristics of the coal being processed. This adaptability enhances the versatility of centrifuges in coal washing plants.

4.Reduced Moisture Content:

Centrifuges are capable of achieving low moisture content in the final product. This is essential for improving the quality of the coal, reducing transportation costs, and enhancing combustion efficiency.

5.Continuous Operation:

Centrifuges can operate continuously, contributing to a steady and uninterrupted dewatering process. This continuous operation is valuable for maintaining a consistent production output in coal washing plants.

6.Versatility in Application:

Centrifuges are versatile and can be used for various types of coal and different particle sizes. They can handle both coarse and fine coal fractions, making them suitable for diverse coal washing applications.

7.Compact Design:

Many modern centrifuges, including those designed by Aury, are built with a compact design. This can be advantageous for installations with limited space or when retrofitting existing coal washing plants.

8.Reduced Environmental Impact:

Efficient dewatering using centrifuges contributes to minimizing the environmental impact of coal washing operations. Lower moisture content in the processed coal can lead to reduced water usage and fewer environmental concerns related to water discharges.

9.Ease of Maintenance:

Well-engineered centrifuges often feature designs that facilitate ease of maintenance. This includes components that are accessible for inspection, repair, and routine maintenance, contributing to overall equipment reliability.

10.Cost-Effective Operation:

The efficient dewatering and solid-liquid separation capabilities of centrifuges can lead to cost savings in terms of reduced transportation costs, optimized energy consumption, and improved overall process efficiency.

It’s important for coal washing plants to carefully evaluate specific centrifuge models, including those from Aury, based on their technical specifications, performance characteristics, and suitability for the unique requirements of the coal processing operation.

Umair Akram

Umair Akram

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