How to Enhance the Screening Efficiency of Circular Vibrating Screens

Circular vibrating screens feature substantial vibration in the screening box, thereby reducing material blockage of the screen apertures. To enable users to better utilise circular vibrating screens, it is necessary to consider the following five aspects for improving screening efficiency, thereby achieving higher screening efficiency and productivity.

1. Employing Larger Screen Mesh Sizes

Utilising larger mesh sizes increases vibratory force and amplitude, thereby amplifying the impact and shear stresses exerted by the screen plate upon the material. This overcomes adhesion between mineral particles, reduces screen surface blockage, and facilitates rapid loosening, stratification, and separation of screened material. Improved operating conditions effectively enhance the vibrating screen's screening efficiency.

2. Increasing the screening area on the circular vibrating screen

Reducing the material load per unit screen area enhances screening efficiency. Optimal efficiency occurs when the actual material load on the screen surface is approximately 80% of the screen capacity. Given the significant volume of fine particles being screened, ensuring sufficient screening area is crucial. Appropriately extending the screen surface length to achieve a length-to-width ratio exceeding 2:1 can effectively boost screening efficiency.

3. Employing a reasonable inclination angle to control material flow velocity

Generally, a steeper inclination of the vibrating screen accelerates material movement across the mesh, increasing throughput but reducing efficiency. To enhance screening efficiency, the material movement velocity on the screen surface should be maintained below 0.6m/s, with the screen surface inclined at approximately 15° to the left or right.

4. Implementing the equal thickness screening method

As screening progresses from feed to discharge ends, material thickness on the screen gradually decreases, causing inefficient feeding patterns where screen utilisation starts dense and becomes sparse. Employing zigzag screens with varying inclines can control distinct movement speeds across each screen section. This allows the mineral flow to advance at an incline, enhancing penetration of difficult-to-screen particles at the discharge end.

5. Employing multi-layer screens

In conventional single-layer screening, nearly all ‘difficult-to-screen particles’ and ‘blocking particles’ migrate from the feed end to the discharge end, thereby impairing the stratification and separation of medium and fine materials. Utilising multi-layer screens with progressively larger apertures from the lower to upper layers and gradually decreasing inclination angles allows different particle sizes to undergo loosening, stratification, pre-screening, and fine screening on the upper, middle, and lower sections of the inclined screen surface. This enables materials of varying particle sizes to undergo loosening, stratification, pre-screening, and fine screening on upper, middle, and lower screen surfaces with differing inclinations and apertures. This approach overcomes screen clogging and enhances screening efficiency.

The above outlines five methods to improve vibrating screen efficiency. In sand and gravel production, should vibrating screen performance prove inadequate, these techniques can be employed to enhance circular vibrating screen efficiency.

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