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Screening Efficiency of Vibrating Screen

One of the major concerns in classification is screening efficiency. Basically, efficiency is the separation quality achieved by the screen.

A screen operating at low efficiency can cause serious problems, among which we mention:

  1. Overload of the closed crushing circuit: a screen operating at low efficiency generates more re-circulating load as part of the material that should pass through the screen returns to the circuit, reducing actual crusher output and overloading belt conveyors and other auxiliary equipment.
  2. Products non-compliant with speciffications: a final classification screen operating at low efficiency can generate products contaminated with particles of size non-compliant with specii cations.

Evaluation of screening process results is achieved by determining efficiency factors and through contamination of separated fractions.

There are two efficiencies we must take into account, depending on the product being considered:

EFFICIENCY OF UNDERSIZE REMOVAL: If the oversize is considered to be the product on the screen, it is desirable to have a minimum of undersize material.

EFFICIENCY OF UNDERSIZE RECOVERY: If the undersize is considered to be the prod- uct of the screen, it is desirable to recover the maximum undersize material existing in the feeding.

Tagged: Vibrating Screen

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