The working principle of a high-frequency screen is a process centered on high-frequency, low-amplitude vibration, specifically designed for the efficient screening of fine-grained and viscous materials. The process can be broken down as follows:

Step 1: High-Frequency Excitation and Breakdown of Surface Tension: Once the screen is started, the exciter generates high-frequency vibrations at a rate of 1,500 to 7,200 times per minute. These high-frequency vibrations first act on the material (especially mineral slurry or viscous slurries), directly breaking down the surface tension and liquid film on the slurry’s surface, thereby dispersing fine particles that were previously agglomerated due to viscosity.

Step 2: Material Stratification and Separation: Under continuous high-frequency vibration, the material on the screen surface undergoes vigorous but low-amplitude oscillations. This step is crucial, as it accelerates the rearrangement (stratification) of the material based on particle size and density. Fine particles—particularly high-density useful minerals—rapidly settle and move toward the screen surface, while coarse particles are “pushed” to the upper layers. This significantly increases the opportunity for material smaller than the screen aperture size to come into contact with the screen apertures.

Step 3: Fine-Grain Screening: Due to the high vibration frequency, the material is thrown upward and comes into contact with the screen surface an extremely large number of times per unit of time. For qualified fine particles that have already been stratified and reached the screen surface, the energy provided by the high-frequency vibration is sufficient to overcome the resistance encountered as they pass through the screen apertures, allowing them to quickly pass through and become the undersize product. Fine, heavy particles mixed with the slurry can also pass through the screen openings along with the slurry.

Step 4: Coarse Particle Discharge and Material Conveyance: At the same time, coarser particles that fail to pass through the screen openings move forward along the screen surface under the combined effect of the screen’s inclination and high-frequency micro-vibrations, eventually being discharged through the discharge port, thereby completing the separation of oversize and undersize materials.

Summary: Compared to ordinary vibrating screens, the core feature of high-frequency screens lies in “high frequency and low amplitude.” The high frequency provides fine particles with sufficient energy to disperse and pass through the screen, while the low amplitude prevents the disruption of the formed filter layer (which is particularly important for dewatering screening) and excessive material bouncing, resulting in more precise and efficient screening. Some of our advanced models also employ technologies such as dual-frequency composite vibration, further optimizing the screening process.