material is delivered to a feed device 2 of a stream type dryer including an uptake or riser 5 the riser delivers particles in suspension to a separator or sifter 6 which in turn delivers coarser particles through a line 7 into a comminution device 8 such as an impact pulverizer the feed device 2 may also be supplied with previously dried comminuted raw material and or as shown filter dust 3 from an exhaust gas dust removal precipitator 4 and thus produce a mixture of charging material favorable to optimum drying conditions the raw material introduced through the feed device 2 is dried on its way through the riser or uptake 5 the oversized grains being delivered through a line 7 to a comminution device 8 in the comminution device 8 the gravel is comminuted to the fineness of a powder and is again centrifuged into the uptake or riser 5 by means of this circulation with subsequent comminution of coarse particles a constant stream of powder fine dry material leaves the sifter 6 through a line 9 and is separated in a separating apparatus 10 from the drying medium the dry material leaves through a line 11 in powder form and is delivered directly without intermediate storage to a cyclone preheater generally indicated at reference numeral 12 in the particular form of the invention shown in fig1 the cyclone preheater 12 consists of a four step unit connected in series to a calcining kiln 13 which in turn is connected to a clinker cooler 14 the calcining kiln 13 is preferably a rotary kiln and the cooler 14 is preferably an inclined grate cooler in this calcining assembly the raw material is calcined to cement clinker and the cooled clinker.