Abstract: In batchwise operation, the granulate grains (4) are filled into the dedusting container (9), which has no closure element at the lower granule outlet opening (25) and in which the whirling nozzles (31) for introducing compressed air are arranged in a lower cone (28), and—in particular depending on the filling level in the intermediate container (14) below—are filled into the dedusting container (9) either dropped downwards without counterflow (32), dedusting being effected by conveying out the introduced air, optionally due to the negative pressure at the upper air outlet opening, whereby only freely suspended dust particles are sucked off or already during the filling process a counterflow (32) is introduced, which partially does not allow the filled granulate grains (4) to fall through the granulate outlet opening (25) but holds them quasi floating at the level of the lower third or lower quarter of the dedusting container (9).

Abstract: In order to be able to operate a dust separator with or without a lower closure element (44), the closure element (44) is part of a separate closure unit (40) which is mounted under the dust separator if required. For this purpose, the dust separator, the closure unit (40) and optionally further components, such as a delivery flow generator, are kept available in a kit so as to be able to assemble the treatment unit as required. The dust separator can be operated in batches by means of the closure element (44).

Abstract: In batchwise operation, the granulate grains (4) are filled into the dedusting container (9), which has no closure element at the lower granule outlet opening (25) and in which the whirling nozzles (31) for introducing compressed air are arranged in a lower cone (28), and—in particular depending on the filling level in the intermediate container (14) below—are filled into the dedusting container (9) either dropped downwards without counterflow (32), dedusting being effected by conveying out the introduced air, optionally due to the negative pressure at the upper air outlet opening, whereby only freely suspended dust particles are sucked off or already during the filling process a counterflow (32) is introduced, which partially does not allow the filled granulate grains (4) to fall through the granulate outlet opening (25) but holds them quasi floating at the level of the lower third or lower quarter of the dedusting container (9).