How To Improve The Impact Of Material Properties On The Screening Efficiency?

Material particle size and moisture content directly affect the screening effect of a mining vibrating screen. Generally, materials with higher hardness and better brittleness are screened better than materials with lower hardness and poor brittleness. The following methods can effectively mitigate the impact of material characteristics on the screening efficiency of a vibrating screen, thereby improving screening performance and production efficiency.

1. Selecting the proper screen and mesh size

Materials with high moisture content are prone to clumping, reducing screening efficiency. Generally, for wet materials with high moisture content, selecting a screen with larger mesh sizes can improve screening performance. For materials with low bulk density, secondary crushing before screening may be necessary. For irregularly shaped materials, choose circular mesh; for cylindrical materials, choose rectangular or circular mesh.

2. Controlling the material layer thickness

Ensuring a suitable material layer thickness avoids excessive material accumulation on the screen surface, ensuring sufficient material movement speed and thorough screening.

3. Wet screening

For materials with slightly higher moisture content, prone to clumping, or with a certain degree of stickiness, as well as materials with a mud content greater than 8%, wet screening or pre-washing methods can be used to improve screening performance.

4. Increasing vibration amplitude

Selecting appropriate vibration frequency and amplitude based on the material’s particle size, moisture content, viscosity, and hardness can accelerate material stratification and improve screening efficiency. When the material particle size approaches the screen aperture size, the screening efficiency decreases significantly. These particles may clog the screen apertures, reducing the effective screening area, a common phenomenon in closed-circuit crushing processes. This can be improved by increasing the amplitude of the vibrating screen. Increased amplitude promotes the passage of fine materials through the screen surface, reducing clogging. It also increases the throughput of the central section of the screen, improving the screening effect.

5. Increase screen aperture area

Select screens with a large aperture ratio to improve screening efficiency and production capacity, but attention must be paid to screen surface strength and lifespan.