Method and mixture for treating electric arc furnace dust
AssigneeConversion Systems, Inc.
InventorCharles L. Smith
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Abstract
A method and a mixture for chemically stabilizing electric arc furnace dust (EAFD) by entrapping the metals inherent in EAFD within a cementitiously hardened product from the mixture. The method includes using the pozzolanic characteristics of EAFD and forming a mixture of EAFD with sufficient water and lime, as necessary, and then allowing the mixture to react to form a cementitiously hardened product. The hardened product has acceptable leachate concentrations, permeability characteristics and unconfined compressive strength.
Claims17
A composition of matter comprising:
- a mixture of:
- (a) a cementitious reactant consisting of EAFD,
- (b) sufficient water to react with said EAFD, and
- (c) 2-12% available lime measured on a wet weight basis, adapted to form a cementitiously hardened product.
A method of treating EAFD to reduce the concentration of hazardous constituents in leachate therefrom comprising the steps of:
- forming a mixture of water, 2% to 12% available lime measured on a wet weight basis and a cementitious reactant consisting of said EAFD;
- and permitting said mixture to react and form a cementitiously hardened product.
Dependencies are inferred from the claim text.