PROCESS FOR CHEMICAL STABILIZATION OF HEAVY METAL BEARING DUSTS AND SLUDGES, SUCH AS EAF DUST

摘要

A calcium-alumino-silicate composition comprising the reaction product of electric arc furnace dust and/or an aqueous chemical waste sludge including a source of ferrous ions and selective additive materials, the additive materials are selected so that the total composition of the additive ingredients and said sludge includes fly ash, electric arc furnace dust, lime kiln dust, ferrous sulfate, hydrated lime to provide an alkalinity of about 9 to 9.5% and water, the composition contains at least 0.2% by weight of ferrous ions and is hardenable through chemical reactions, the product of which includes calcium-alumino-silicates.