The screw or spiral classifier is used for efficient separation of fines and coarse materials in a washing medium. It consists of a heavily built and slow rotating screw that is semi-submerged in an inclined trough, which is semicircular in cross-section and tub-shaped at the lower end built with an over-flow weir.
The washing medium or slurry is fed continuously midway in the lower tub. The gentle turbulence caused by the rotating screw keeps the finer particles afloat and allows heavier particles to settle to the bottom of the tub. The spiral picks up and moves the settled particles upward along the inclined trough and discharges on to a conveyor belt for transportation to storage.
The floating fines will overflow the weir and taken to sludge tanks for disposal or further recovery process. The speed of the spiral can be varied and weir discharge height could be adjusted to create a virtual hydraulic screen-mesh, i.e., the particle size at which separation is desired, to precisely separate the product fraction that will be raked up by screw while the unwanted fines get drained-off.
YES Screw Classifiers are ideal machines for fines recovery of minerals. It is proved to be the most efficient equipment for sand washing, classification and purification, and produces the best quality concrete sands and plaster sands meeting the particle distribution standards
|Model||Screw Dia Over-flow Capacities (Max) - LPM & Length - mm||Screw Speed - RPM||Drive Motor kW||Racking Capacity TPH||Over-flow Capacities (Max) - LPM|
|200 Mesh (75 microns)||150 Mesh (100 microns)||100 Mesh (150 microns)|
|YW 60||600 x 5000||8 - 16||5.5||11 - 22||745||850||1890|
|YW 90||900 x 6500||6 - 12||7.5||22 - 45||660||1230||2650|
|YW 120||1200 x 8000||4 - 8.8||11||45 - 90||1700||3120||6245|
|YW 150||1500 x 9000||3 - 6||22||80 - 150||2180||3785||8330|
|YW 180||1800 x 9000||3 - 5||30||150 - 210||2650||4730||9840|