Separator for dry separation of powders

A system for dry separation of powders into at least two fractions including a powder to be separated and a separator comprising:

• a) a hollow body rotatable about a vertical axis, the hollow body having a cavity of open from above and from below and the cavity comprising a surface of revolution having a central axis coinciding with the rotation axis of the body, the upper edge of the cavity having a gate diameter than its lower edge;
• b) a system rotating the body;
• c) at least one feeder continuously feeding dry powder into a feeding zone adjacent to the cavity surface near its lower edge, the length of the zone being at least an order of magnitude less than a circumference of the cavity surface in its lower portion;
• d) at least one discharge device constructed and arranged to essentially continuously remove powder from a cavity surface, comprising a suction nozzle arranged along essentially the entire generatrix of the surface of revolution;
• e) at least two hoppers, one of which is constructed and arranged to receive a powder fraction comprising powder particles passing over the upper edge of the cavity surface in the core of separation, and the second is intended for powder fraction remaining on the cavity surface until being suctioned by the nozzle.

A system for dry separation of powders into at least two fractions, the system comprising a powder to be separated and a separator comprising:

• a hollow body rotating about an axis and defining a cavity having a powder engaging surface, the powder engaging surface being a surface of revolution which rotates about the axis, an upper edge of the cavity having a greater diameter than a lower edge;
• a system controlling the rotation of the body;
• at least one feeder continuously feeding dry powder into a feeding zone adjacent to the cavity surface near the lower edge of the cavity surface, the length of the feeding zone being at least an order of magnitude less than a circumference of the cavity surface of the lower edge;
• at least one of the at least one feeder constructed and arranged to feed the dry powder into the hollow body at a location offset from the axis;
• at least one discharge device continuously discharging the powder from the cavity surface, the at least one discharge device comprising a body arranged along substantially the entire length of the generatrix of the cavity surface and located immediately in front of the feeding zone aligned with the rotation of the cavity surface, the at least one discharge device constructed and arranged to discharge the powder from the cavity surface a result of the cavity surface moving relative to the at least one discharge device;
• a first hopper for collecting a powder fraction consisting of powder particles passing over the upper edge of the cavity surface;
• a second hopper for collecting a powder fraction remaining on the cavity surface until the discharge device discharges the remaining powder fraction from the rotating cavity surface into the second hopper.