Patent ID: 8905336

Claim:
Method for comminution of mill feed, wherein the mill feed is subjected to a grinding-drying process in a mill with supply of a hot gas, is classified and fed as dust-gas mixture to a filter for dust separation, and wherein after the filter and a mill fan the hot gas is branched off as hot exhaust gas and discharged via a flue to the environment, while a portion of the hot exhaust gas is fed back to the mill as recirculation gas after mixing-in of fresh air, wherein at least a portion of the fresh air fed to the grinding-drying process is preheated before admixing to the recirculation gas, for the preheating of the fresh air at least a portion of, the hot exhaust gas to be fed to the flue is used and the hot exhaust gas used for preheating the fresh air is discharged at a lower temperature to the environment via the flue.