Methods to improve the comprehensive recovery rate of coal washing include strengthening raw coal management, optimizing the screening process, controlling the amount of coal entering the washing process, rationally blending coal, optimizing production processes, conducting technical inspections, and strengthening wastewater management in the coal transportation system. These measures complement each other and work together to achieve the goal of improving the recovery rate of coal washing.

How can the comprehensive recovery rate of coal washing be improved?

1. Strengthening raw coal management

Strengthening the moisture detection of raw coal is a key link in improving the recovery rate of coal washing. The moisture content in raw coal will directly affect the subsequent coal preparation efficiency and washing effect. In the coal preparation process, excessive moisture will cause coal to stick together, reduce screening and washing efficiency, and also increase energy consumption and cost during transportation.

2. Reduce the thickness of the coal seam on the screen

Reducing the thickness of the coal seam on the screen can improve the screening effect of coal, thereby increasing the recovery rate of clean coal. The control of the thickness of the coal seam on the screen mainly depends on the aperture size of the screen, the inclination of the screen, and the screening speed. By setting these parameters scientifically, the coal can be better separated during the screening process, reducing the loss of clean coal, thereby improving the overall recovery rate.

3. Control the amount of coal entering the washing

Reasonable control of the amount of coal entering the washing can ensure that each batch of coal can be fully washed, reduce the loss of clean coal, and improve the recovery rate. If the amount of coal entering the washing is too large, it exceeds the design capacity of the washing equipment, which will cause the equipment to be overloaded, resulting in insufficient coal washing, and may even cause damage to the washing equipment.

4. Reasonable coal blending

Different coal types and qualities may require different washing processes. By mixing different types of raw coal, the overall quality of coal can be made more uniform, reducing unnecessary sorting difficulties during the washing process, thereby improving the accuracy and recovery rate of washing.

5. Optimizing production processes

It is necessary to optimize the process flow and improve production efficiency continuously. Process improvements often need to be achieved through technological innovation, such as the use of new screening technologies, washing equipment, or automated control systems, which can improve the accuracy and stability of the production process, thereby improving the recovery rate of coal washing.

6. Technical inspection

Regularly inspecting and repairing coal preparation equipment to ensure the normal operation of the equipment can prevent production interruptions caused by equipment failures. At the same time, regular evaluation of equipment performance is carried out to timely identify bottlenecks in production and make targeted improvements, which is also an effective way to improve the recovery rate of washing.

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