There have been increasing efforts to utilize energy by-products( EBP) all over the world. In the Czech Republic fly ash is usually used in ceramic technology,especially in brick manufacturing and for ceramic tiles.The average production of EBP is about 14 million tons per year. The range of potential products,where EBP could be used,is very wide and energy by-products have become an important raw material source. In this paper the attention was focused on class C fly ash and its usage in field of refractory materials. Experimental works were carried out on mixtures with fly ash and clay. There were also tested batches for lightweight fireclay bricks.The maximal amount of CFA should be up to 50%.
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