1. A PROCESS FOR THE TRANSFER OF HEAT FROM THE HOT WASTE GASES ISSUING FROM A CEMENT KILN TO THE PULVERULENT RAW MATERIAL BEING SUPPLIED TO SAID KILN COMPRISING (A) PASSING THE RAW MATERIAL THROUGH A CLASSIFIER AND SEPARATING THE RAW MATERIAL INTO A COARSE FRACTION AND A FINE FRACTION; (B) FORMING A FLOWING STREAM FROM SAID WASTE GASES; (C) ENTRAINING THE SEPARATED COARSE FRACTION IN SAID STREAM SO THAT THE COARSE FRACTION IS HEATED THEREBY;