What pumps are used in coal washing plants?

Pumps Employed in Coal Washing Plants

Coal washing plants deal with a diverse range of media under complex working conditions, necessitating the use of various pumps. The main types include slurry pumps, coal sludge pumps, clean water pumps, and mortar pumps. Let's explore the primary application scenarios and advantages of each pump type:

Slurry Pump

Application Scenario

In the coal sludge water system of a coal washing plant, slurry pumps are indispensable for transporting liquids laden with a large quantity of coal slag and coal sludge particles. For instance, they are used to convey high-concentration coal sludge from the bottom of the concentration tank to the filter press. In the heavy-medium coal preparation process, they transport the suspension containing magnetite powder. These pumps ensure the stable transfer of coal sludge and related media across different processing stages, making them key equipment in the coal washing plant.

Advantages

• The flow-through parts are crafted from highly wear-resistant materials like high-chromium alloy cast iron and polyurethane. This effectively guards against the erosion and wear caused by coal slag and coal slime particles, thus extending the equipment's lifespan.

• They offer a wide range of flow rates and heads. This allows for flexible selection based on the coal washing plant's scale, the conveyance distance, and height requirements, catering to diverse working conditions.

• The impeller and pump body are designed rationally, featuring a wide flow channel. As a result, they are less likely to be blocked by large particles, ensuring a smooth transportation process.

Coal Sludge Pump

Application Scenario

Specifically engineered for transporting the coal slime generated during the coal washing process, coal sludge pumps play a crucial role in the coal slime recovery process. For example, they convey coal slime from the sedimentation tank to the coal slime dryer for drying. In the coal slime flotation process, they transport the pre-flotation coal slime slurry to the flotation machine.

Advantages

• They exhibit strong adaptability to coal slime, capable of handling high-concentration and high-viscosity coal slime.

• Generally, they possess good self-priming capabilities, effectively preventing cavitation and guaranteeing the pump's stable operation.

• Some coal sludge pumps are equipped with stirring devices. These devices prevent coal slime from settling, maintaining the continuity and stability of the transportation process.

Clean Water Pump

Application Scenario

Clean water pumps are mainly tasked with transporting clean water or liquids similar to clean water within the coal washing plant. In the circulating water system, they supply circulating water to equipment such as jigs and heavy-medium cyclones, ensuring the normal operation of these devices. They are also extensively used for washing workshop floors and in fire-water supply systems.

Advantages

• They have a relatively simple structure, enabling high-efficiency operation and efficiently accomplishing the clean water delivery task.

• Their sealing performance is excellent, effectively preventing leakage. This ensures the rational utilization of water resources and avoids any negative impact on the coal washing plant's environment.

• Depending on different usage scenarios, they are available in a variety of flow and head specifications, meeting diverse requirements.

Mortar Pump

Application Scenario

Mortar pumps are suitable for transporting slurry that contains mixed materials such as sand particles and coal slime. In sand-washing operations, they transport the mortar with sand particles and a small amount of coal slime to the sand-washing machine for separation. In the tailings treatment system, they transfer the tailings mortar to the tailings pond.

Advantages

• They have good wear resistance, capable of withstanding the abrasive action of sand particles.

• They offer a certain head and flow rate to meet transportation demands.

• During the design process, the characteristics of the mixed materials are considered. This helps prevent sand particles and coal slime from depositing in the pump, ensuring smooth transportation.