Process for chemical stabilization of heavy metal bearing dusts and sludges
AssigneeBethlehem Steel Corporation
InventorsJohn D. Lynn, Charles E. Jablonski, Walter D. Egan
Life of this patent
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Abstract
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.
Claims11
A calcium-alumina-silicate composition comprising:
- the reaction product of 25-70% by weight of a waste material selected from the group consisting of aqueous chemical waste sludge and electric are furnace dust, and additive materials comprising 3-10% by weight fly ash, 10-20% by weight lime kiln dust, ferrous sulfate, hydrated lime to provide an alkalivity of about 9 to 9.5% and water;
- said composition containing at least 0.2% by weight ferrous ions and being hardenable through chemical reactions, the product of which includes calcium-alumino-silicates.
Dependencies are inferred from the claim text.