Screens, separating capacity

Scatchard-Hildebrand equation, 374 Schacham equation, friction factor, 94 Scheibel extractor, 483,487 Schildknecht column, 543,544,546 Screens, separating, 335, 337 capacity, 335, 340 flat, 335... 

Gyratory screen separators, which impart a basically circular motion to the particles on the screen, are used for high capacity separation by size of dry materials, and for wet separations when oversize material constitutes a laige percentage of the feed (a typical example is shown in Figure 3.13). Common practice with gyratory screens has been to adapt the motion of one type of machine to perform either wet or dry separations, since two distinctly different types of motion are required for the best efficiency. 

The selection of a mobile diase for the separation of simple aixtures may not be a particuleurly difficult problem and can be arrived at quite quickly by trial and error. Solvent systems can be screened in parallel using either several development chambers or a device like the Camag Vario KS chamber, which allows the simultaneous evaluation of a number of solvents by allowing each of these to migrate along parallel channels scored on a single TLC plate [8]. However, whenever the number of components in a mixture exceeds all but a small fraction of the spot capacity for the TLC system, a more systematic method of solvent optimization is required. 

Vibrating screens, horizontal and inclined screening surfaces vibrated at high frequencies (1000 to 7000 Hz). High capacity units, with good separating efficiency, which are used for a wide range of particle sizes. 

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