The use of waste materials in the Austrian cement industry

A high firing temperature of about 2,000°C, a flue gas temperature of more than 1,000°C combined with a residence time of 5 to 7 sec., an extensive sintering of all raw materials flowing through the rotary kiln and a neutralization of acidic flue gas components by intensive contact with the basic raw meal are the most important reasons for the destruction and for the permanent sealing of pollutants in the cement clinker.