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AssigneeBethlehem Steel Corporation
InventorsJohn D. Lynn, Charles E. Jablonski, Walter D. Egan
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This invention is directed to a process for the chemical stabilization of heavy metal bearing dusts and sludges. A preferred use for such process is the treatment of dust from an electric arc furnace (EAF). In the production of steel by the electric arc furnace process, a by-product thereof is the generation of EAF dust. Such dust, by virtue of the presence of such elements as cadmium, hexavalent chromium and lead, is classified as hazardous waste by U.S. Environmental Protection Agency (EPA). The present invention is directed to a process for the chemical stabilization of the inorganic EAF dust to render the hazardous constituents thereof virtually immobile. Such process is based on the pozzolanic reaction of materials containing anhydrous alumino-silicates which, in the presence of lime, water and chemicals, adsorb and/or physically entrap the heavy metals present in EAF dust into a calcium-alumino-silicate matrix.
A method of chemically stabilizing waste material selected from the group consisting of electric arc furnace dust, lime kiln dust and fly ash, where such material contains heavy metals and may be classified as hazardous waste, comprising the steps of
A method of chemically stabilizing waste material selected from the group consisting of electric arc dust, lime kiln dust and fly ash where such material contains heavy metals and may be classified as hazardous waste, comprising the steps of
A method of chemically stabilizing waste material selected from the group consisting of dusts and sludges, where such material contains heavy metals and may be classified as hazardous waste, comprising the steps of
Dependencies are inferred from the claim text.