Process for the thermal treatment of asbestos cement products

摘要

The invention relates to a method for the thermal treatment of asbestos-cement products to be disposed of for the further recycling of asbestos-containing waste products, the asbestos-cement products being fed as piece goods, but without prior mechanical processing of the fragments, to a tunnel kiln and at treatment temperatures of approx. 1000 ° C. and a residence time of at least 30 min. the crystal structure of the asbestos fibers is destroyed and, as a result, the irreversible formation of the end product is achieved, which is similar to the usual composition of normal Portland cement, so that a physiologically safe, asbestos-free intermediate product of cement-like chemical composition with the character of a secondary raw material is created, which is used in the cement industry as a component for preparation the raw meal mixture is used for clinker production and / or as cement flour.