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Detail and applicable scope of trommel screen

2017-08-25

(A) Introduction
A trommel screen, also known as a rotary screen, is a mechanical screening machine used to separate materials, mainly in the mineral and solid-waste processing industries. It consists of a perforated cylindrical drum that 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. Trommel screen is mainly directed against the particle size of materiel to make a hierarchical processing and is widely used in power, mining, metallurgy, building materials, chemical and other production industries. It commonly used in the classification of refractory materials, coal, sand gravel, as well as coal, coke, lime, sand gold and other viscous wet material sifting. The product structure is more symmetrical to satisfy the needs of production. The trommel screen is mainly composed of an electric motor, a reducer, a roller device, a machine frame, a sealed cap and Material in-and-out Mouth.
no-dyed-of--trommel-screen(B) Scope of application
1. Municipal and industrial waste
Trommel screens are used by the municipal waste industry in the screening process to classify sizes of solid waste. Besides that, it can also be used to improve the recovery of fuel-derived solid waste. This is done by removing inorganic materials such as moisture and ash from the air-classified light fraction segregated from shredded solid waste, thereby increasing the quality of the product fuel. In addition, trommel screens are used for the treatment of wastewater. For this particular application, solids from the entering flow will settle onto the screen mesh and the drum will rotate once the liquid reaches a certain level. The clean area of the screen is submerged into the liquid while the trapped solids fall onto a conveyor which will be further processed before removal.
2. Mineral processing
Trommel screens are also used for the grading of raw materials to recover valuable minerals. The screen will segregate minuscule materials which are not in the suitable range of size to be used in the crushing stage. It also helps to get rid of dust particles which will otherwise impair the performance of the subsequent machineries in the downstream processes.

red-of--trommel-screen
3. Other applications
Other applications of trommel screens can be seen in the screening process of composts as an enhancement technique. It selects composts of variable size fractions to get rid of contaminants and incomplete composted residues, forming end products with a variety of uses. Besides this, the food industries use trommel screens to sort dry food of different sizes and shapes. The classification process will help to achieve the desired mass or heat transfer rate and avoid under or over-processing. It also screens tiny food such as peas and nuts that are strong enough to resist the rotational force of the drum.
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