Coal Washing Pump

A coal washing pump, also known as a slurry pump, is a type of pump specifically designed for handling abrasive and high-density slurries that are encountered in the coal washing process. The coal washing process involves separating coal from impurities and other materials to improve its quality and efficiency for burning. Here’s a detailed look at what a coal washing pump is and its key aspects:

Purpose and Function

  • Transporting Slurry: Coal washing pumps are used to transport slurry, which is a mixture of water, coal particles, and impurities, through the various stages of the coal washing process.
  • Handling Abrasive Materials: These pumps are designed to handle the abrasive nature of the slurry, which contains solid particles that can cause significant wear and tear on regular pumps.

Key Components and Features

  1. Casing: Typically made from high-strength materials such as high-chrome alloy or rubber-lined steel to resist abrasion and corrosion.
  2. Impeller: Designed to handle slurry, usually made from durable materials to withstand the abrasive nature of the coal slurry.
  3. Shaft and Bearings: Heavy-duty shafts and bearings to support the impeller and handle the mechanical stresses involved.
  4. Seal: Specialized seals to prevent leakage of the slurry and to handle the harsh conditions of the coal washing process.

Types of Coal Washing Pumps

  • Horizontal Slurry Pumps: These are the most common type, installed horizontally, and are suitable for a wide range of applications in coal washing.
  • Vertical Slurry Pumps: Installed vertically, these pumps are ideal for applications where space is limited or where the slurry needs to be lifted from a sump.

Applications in Coal Washing

  1. Raw Coal Desliming: Removing fine particles (slimes) from raw coal to improve its quality.
  2. Coal Separation: Transporting the coal-water mixture to and from separators, such as cyclones or flotation devices.
  3. Thickening and Dewatering: Moving slurry to thickening tanks or dewatering screens to remove excess water from the coal.
  4. Waste Disposal: Pumping waste slurry to disposal sites or tailing ponds.


  • Durability: Built to withstand the highly abrasive and corrosive nature of coal slurry, resulting in a longer service life.
  • Efficiency: Designed to handle high-density slurries, ensuring efficient transport and processing of coal.
  • Cost-Effectiveness: Reduces maintenance costs and downtime due to its robust design and materials.

Maintenance and Considerations

  • Regular Inspection: Frequent checks for wear and tear on the impeller, casing, and seals to ensure efficient operation.
  • Material Selection: Choosing the right materials for the pump components based on the specific conditions and type of slurry.
  • Spare Parts Availability: Ensuring availability of spare parts for quick replacement and minimal downtime.


Coal washing pumps are essential for the coal washing process, handling the transport of slurry with high efficiency and durability. Their design caters specifically to the abrasive nature of coal slurry, ensuring reliable and cost-effective operation in coal processing plants.

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