Zpravodaj Hnědé uhlí 2015, 55(2)
Sintered ash aggregate
Artificial aggregates made of sintered fly ash is an example of a material that can be produced just from fly ash without other admixture. For this ideal case is, however, necessary to have optimal type of raw materials, which achieves the essential fine particle size and contains the appropriate proportion of combustible substances. However, to ensure optimal conditions during the sintering process and to obtain high-quality aggregates the necessary attention has to be paid to the study of the influence of the fly ash character on the formation of ash body. The world experiences are focused rather on the production of artificial ash aggregate based on hydration with cement or lime. Artificial sintered aggregates is often made using obsolete technologies without significant research and innovation. As a basis for the evaluation of the impact of the ash character on the progress of the sintering and ash aggregate formation the knowledge of ceramics industry can be used [1]. In the case of the fly ashes, however, the material is very heterogeneous, influenced by thermal processes in their creation, and so it is necessary to deal with this issue.
Keywords: artificial aggregates, fly ash, firing, ceramics, sintering
Published: June 1, 2015 Show citation