Types
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Fixed Sieve
These are primarily used for dewatering coarse/fine coal after the heavy media operation or dewatering coal if they carry excessive surface moisture. The fixed sieve has the profile deck inclined at an angle which helps to flush the coarse material of its moisture or water contents.
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Radial Sieve
Functionally these also are used for dewatering fine/course coal after heavy media separation or gravity separation. The advantage of a Radial Sieve Bend is - the profile deck arranged in a radial housing with a 45-60 Degree arc with varying radius. It is engineered according to feed capacity and for retaining material on the deck long enough for maximum drainage of water and concentrates. The sieve can be rotated 360 degrees and adjustable inclinations thus ensuring longer life of the surface.
Operating Principles
A sieve bend removes water and effects a size separation by a process much different than a vibrating screen. While a vibrating screen randomly lifts and drops the particles to present them to a screen aperture, a sieve bend presents the slurry to the leading edge of each perpendicularly positioned screen wire. The material moves with the aid of gravity.
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