Device of selective granulometric separation of solid powder materials, centrifugal action, and method of use of such a device

摘要

Device (1) for selective granulometric separation of solid powder materials, with centrifugal action, suitable for separating materials into two fractions, a fraction of fine materials and a fraction of thick materials, comprising: - a housing (6), - a cylindrical rotor (2), rotatable with respect to said housing along a vertical axis, internal to said housing, provided with blades (3) distributed on the periphery of said rotor (2), - feeding means to said housing ( 6) of a gaseous flow entering through said blades (3) in said rotor (2), - a set of fins (7), internal to said housing (6) and surrounding said rotor (2) ), fixed with respect to the aforementioned housing and possibly adjustable, arranged coaxially in front of the blades (3) to be crossed by the said incoming gaseous flow, - means (8) for introducing the solid materials to be classified in said housing (6) between the alet as (7) and said rotor (2), - an outlet (9) of the rotor (2), to allow the evacuation of the gaseous flow and the entrained, fine materials, - collection means 10, inferior to said rotor ( 2), for the dragged, thick materials that have fallen characterized in that said collection means (10) comprise a peripheral fluidized bed system, whose bed extends around the axis (A) of the rotor (2), at least below said fins (7) and the interspace between said fins (7) and the rotor (2), the velocity of the fluidizing gas being in a horizontal section of the fluidized bed less than 1 m / s in such a way that there is a new separation between the fine materials and the coarse materials for which said fine materials are forwarded to the interspace between said fins and said rotor.