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Dry Screening: Sorting Out The Basic Concepts

By S. Dhodapkar The Dow Chemical Company, L. Bates Ajax Equipment, G. Klinzing Univ |

    The screening process has always been the workhorse for solid-solid separation in chemical, pharmaceutical, food, mineral processing, coal and agricultural sectors. It can be done in dry or wet mode depending on the state of the feed and desired state of the product. It serves many purposes, for example scalping, separation of fines and coarse, dewatering, de-sliming and trash removal. Some typical examples of screening operation are: • Removal of tramp metal or large chunks from product (quality assurance) • Grading of sand to make various grades of sandpaper • Separation of fines from detergents • Separating coffee beans from chaff • Classification of flour based on size • Removing clusters of plastic pellets from prime product • Removing fines from a grinding circuit to reduce energy consumption Each of these and other screening applications has particular challenges and performance requirements. In this article, we highlight various key concepts affecting screener performance and outline how the concept of grade or fractional efficiency can be helpful in characterizing performance, especially when conditions vary. We focus primarily on dry screening operations. Some excellent practical…
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