1. Milling process in which the fine constituents of the material comminuted in a ring mill (1) are discharged pneumatically upwards by means of an air stream supplied via a nozzle ring (15) and form a finished product whilst the coarse constituents fall downwards through the nozzle ring against the air stream and are conveyed upwards again by a mechanical elevator (3), characterized in that the combination of the following features is provided for the simultaneous production of at least two finished products of different fineness : a) the air quantity and the air speed in the nozzle ring (15) are adjusted so that a preclassification is produced in the nozzle ring and the coarse constituents in a defined quantity and gradation of grain sizes fall downwards through the nozzle ring ; b) the coarse constituents conveyed upwards by the mechanical elevator (3) are subjected to a second classification in which at least a proportion of the coarse constituents is extracted as a further finished product.
