B - Operations – Transporting – 09 – B
Patent
B - Operations, Transporting
09
B
261/45
B09B 3/00 (2006.01) C04B 18/04 (2006.01) C04B 28/22 (2006.01) C22B 7/00 (2006.01) C22B 7/02 (2006.01)
Patent
CA 1297502
ABSTRACT OF THE DISCLOSURE This invention is directed to a process for the chemical stabili- zation 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 pres- ence of such elements as cadmium, hexavalent chromium and lead, is classi- fied 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.
569828
Egan Walter D.
Jablonski Charles E.
Lynn John D.
Isg Technologies Inc.
Marks & Clerk
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