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trommel screen
A trommel screen, also known as rotary screen, is an essential unit which is used mainly in the mineral and solid-waste processing industries.〔Stessel et al. 1996, pp. 558-568.〕 It consists of a perforated cylindrical drum which is normally elevated at an angle at the feed end.〔 Physical size separation is achieved as the feed material spirals down the rotating drum, where the undersized material smaller than the screen apertures passes through the screen, while the oversized material exits at the other end of the drum.〔Chen, Y.S. et al. 2010, pp. 1214-1221.〕
== Summary ==
Trommel screens can be used in a variety of applications such as classification of solid waste and recovery of valuable minerals from raw materials. Trommels come in many designs such as concentric screens, series or parallel arrangement and each component has a few configurations. However depending on the application required, trommels have several advantages and limitations over other screening processes such as vibrating screens, grizzly screens, roller screens, curved screens and gyratory screen separators.
Some of the main governing equations for a trommel screen include the screening rate, screening efficiency and residence time of particles in the screen. These equations could be applied in the rough calculation done in initial phases of a design process. However, design is largely based on heuristics. Therefore, design rules are often used in place of the governing equations in the design of a trommel screen. When designing a trommel screen, the main factors affecting the screening efficiency and production rate are the rotational velocity of the drum, mass flow rate of feed particles, size of the drum and inclination of trommel screen. Depending on desired application of trommel screen, a balance has to be made between the screening efficiency and production rate.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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