portable trommel screen
Feeding Density: 0-50%
Trommel screens are one of the oldest screening devices, their structures are very simple but yet with high sorting accuracy and efficiency. So they are still widely used in China and many other countries.
Trommels can be made to deliver several sized products by using trommel screens in series from finest to coarsest such as the one shown; or using concentric trommels with the coarsest mesh being innermost.
Trommels remain widely used in some screening duties, including aggregate screening plants and the screening of mill discharge streams. They are also used for wet-scrubbing ores, such as Bauxite, alluvial gold, diamond ores and etc.
Trommels are installed on a small angle to the horizontal or use a series of internal baffles to transport material along with the cylinder.
When the feeding material enters the roller trommel, due to the tilt and rotation of the trommel, the material on the screen surface is turned and rolled, so that the qualified material (under-screen product) is discharged through the outlet at the bottom of the rear end of the roller, and the unqualified material (upper-screen product) is discharged through the discharge port at the rear of the trommel.
Trommels can handle material from 55 mm down to 6 mm, and even smaller sizes can be handled under wet screening conditions.
Although trommels are typically cheaper, vibration-free, and mechanically robust, they generally have lower capacities than vibrating screens since only part of the screen surface is in use at any one time.
Trommels remain widely and often work with the screening of mill discharge streams. Tumbling mill (AG, SAG, rod, and ball mills) discharge streams usually pass through a trommel screen attached to the mill outlet to prevent grinding media scats from reaching subsequent processing equipment, and the case of AG/SAG mills, to extract pebbles to send to crushing stage.
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