MIHAIL REINHOLD WACHTER, IOANA IONEL, ADINA NEGREA, DUMITRU CEBRUCEAN, VASILE MANZATU, MIHAELA CIOPEC<br>Leaching Investigation of Coal Fly Ash and Dry Desulphurisation Residues by Stabilization into Ash Rock

MIHAIL REINHOLD WACHTER, IOANA IONEL, ADINA NEGREA, DUMITRU CEBRUCEAN, VASILE MANZATU, MIHAELA CIOPEC
Leaching Investigation of Coal Fly Ash and Dry Desulphurisation Residues by Stabilization into Ash Rock

Abstract:

Coal-fired power plants are producing the major percent of the electrical energy worldwide. As a result of coal combustion, a huge amount of fly ash and slag are produced that ends in landfill disposal. Also the by-products resulted from the flue gas desulphurisation plant are produced in significant quantities that also may end in the fly ash landfill disposal. In some particular cases, the fine fly ash is used in the cement industry and the FGD by-products can be used as basic material for civil construction products. The reuse of these products depends on the coal composition and the FGD technology applied. Anyway, only a small fraction of the overall production of fly ash, slag and FGD products is currently reused, and the rest ends in landfill disposal sites. One of the environmentally friendly technologies of land filling for this materials is dense slurry that creates a homogenous mixture between the combustion products and water in controlled proportions with the aim to activate the cementing reactions of pozzolanic elements found in the fly ash and calcium based elements from FGD products. The resulted product is the “ash rock” that encapsulates and prevents the leaching of the harmful elements containing in the fly ash and FGD by-products. Keywords: coal combustion residues, fly ash, flue gas desulphurization by-products, ash rock

Issue: 2015, Volume 66, Issue 11

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