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Comment PDF Separation Processes

Factors Affecting Screening Performance

By William E. Lower, Rotex, Inc. |

Consider these points when selecting and specifying equipment that separates material according to particle size Screening is an integral part of many dry material processes, ensuring an end product that is free of fine or oversized material, or in some cases achieving a specified particle distribution. In any case, the screening process is critical to the quality of the end product. Screening equipment uses screening medium (usually wire mesh or perforated plate) and a screening motion to convey the material across the screening medium, separating the material by particle size. Screening performance, measured as either the product yielded in the operation, or the quality of product yielded, is affected by many factors. In the context of equipment selection, screening machines are evaluated on their ability to optimize product quality and screening efficiency. In any screening application, one or more of the fractions or flows produced by the screener, is the “product.” The product has a quality specification defining its acceptable particle-size distribution. Typically, this specification consists simply of particle size limits and tolerances. Screening efficiency, or product recovery efficiency, is the ratio of (1) the…
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