Z. Giergiczny

The Wastes from Power Plants as Substitute of Natural Raw Materials

Summary The suitability of fly ASHes as a substitute of natural raw materials may be enlarged by using grain size separation, selective collection in the dust collector, physical and chemical activation. The positive results was obtained at blended cements and building materials production. The fly ASHes and botton ASHes disposed as byproducts in power generating stations are utilized not only from the ecological reasons but also because of their beneficious properties. The utilization of fly ASHes in many technologies results from their granulo-metric characteristic such as particle size ranging from a few A to 200 urn and pozzolanic properties. The suitability of fly ASHes may be enlarged by the following operations: grain size separation, selective collection in the dust collector, physical and chemical activation. The grain size separation gives the fly ASH concentrates of different properties. Table 1 shows the variability of chemical composition as a function of grain size.