Method of separating from a particle stream originating from waste-incineration ashes at least a first fraction with particles having small dimensions, and a second fraction with particles having relatively larger dimensions, in which method a separation-apparatus (1) is used to classify metals from said ashes into the first and the second fraction, and wherein the separation-apparatus (1) comprises a rotatable drum (5) having at its circumference (13) plates (6, 6'), each plate having a radially extending hitting surface, at least a first receiving area (11, 11') proximal to the drum (5) for receipt of particles of the first fraction, and at least a second receiving area (12, 12') distant from the drum (5) for receipt of particles of the second fraction, the apparatus further having a housing (6), allowing that the particles (3) of the particle-stream (4) have dimensions in the range 0-15 mm.
