BULK SEPARATOR Russian patent published in 2009 - IPC B07B7/83 

FIELD: instrument engineering.

SUBSTANCE: invention refers to bulk sorting, particularly to grading of powders and similar materials by means of dynamic air separators. The dynamic air separator used for classification of bulk materials, e.g. powders of various particle sizes, comprises a rotary cylindrical screen, a fine-material settling chamber that is provided with a discharge bottom, encased and mounted coaxially on a ledge of the rotary cylindrical screen, thereby permitting the use of vortex generated by said rotary screen for centrifugal bulk separation. The settling chamber has holes formed in its case that provides travelling of centrifugated bulk towards bulk sampling passages being outside of the chamber. The fine-material settling chamber is cylindrical or truncated conical. It embraces reference and/or movable reflectors. An air vent passes through the discharge bottom of the settling chamber and has the diametre 30-95% of that of its bottom. The separator is applied to implement the gradation method that involves feed of the bulk to be processed into a grading zone wherein said bulk is graded to coarse and fine particles in the rotary cylindrical screen regarding rotary speed and air supply velocity. The coarse particles are discharged to a reject box, while the fine particles are collected in the settling chamber being coaxial with the rotary screen. The fine-material gradation is ensured by application of vortex generated by the rotary screen and probably accelerated additionally by the reference or movable reflectors. Dust-free air and fine particles are separated, the latter are delivered to conveying equipment.

EFFECT: improved performance of separation, reduced engineering efforts, lower losses of working mixture in a separating circuit and eliminated external filters or cyclones for fine-fraction collection.

14 cl, 2 dwg