PROCESS FOR CHEMICAL STABILIZATION OF HEAVY METAL BEARING DUSTS AND SLUDGES, ESPECIALLY ELECTRIC ARC FURNACE DUST

摘要

The process is used mainly in the production of steel in electric arc furnaces (EAF) where one of the separated by products is dust containing elements such as cadmium, hexavalent chromium and lead, and for this reason it is classified as hazardous waste the US Environmental Protection Agency. By it, the dust is stabilized and the hazardous constituents of the waste are rendered immobile. By the process, materials containing anhydrous alumino-silicates, in the presence of lime, water and chemicals, adsorb or physically entrab the heavy metals from the dust into a calcium-alumino silicate matrix.