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US 5,347,077 AGranted
Toxic waste fixant and method for using same
AssigneePelt & Hooykaas B.V.
InventorsCarel W. J. Hooykaas, Jeffrey P. Newton
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AssigneePelt & Hooykaas B.V.
InventorsCarel W. J. Hooykaas, Jeffrey P. Newton
Estimating the term…
A toxic waste fixant for detoxification of a contaminated soil, sediment, and or sludge material includes a mixture of: ferric and/or ferrous sulfate, manganese sulfate, and/or aluminium sulfate and/or Portland cement, and/or gypsum (calcium sulfate), and/or blast furnace slag, and/or lime (calcium oxide). Fixants made from mixtures of the above compounds are designed to prevent leaching in excess of regulatory standards for specified inorganic and organic toxic compounds and elements. These fixants will also reduce the concentration of most organic toxic compounds through various chemical reactions and bonding as determined by solvent extractions and analysis by GC/MS. The ferric and/or ferrous sulfate may be partially or completely replaced by cobalt sulfate, whereas instead of the respective sulfates the corresponding chlorides may be used as well.
A fixant for fixing toxic waste material consisting of mixed inorganic and organic toxic compounds, said fixant consisting of an inorganic hydraulic binding agent and a mixture of an iron salt and a manganese salt, wherein said salts react with the toxic compounds at ambient temperature to obtain a metal compound or cluster, and wherein said salts are selected from the group consisting of sulfate and chloride.
A process for rendering harmless a material being polluted with toxic waste, comprising the steps of mixing said material with an aqueous suspension of a fixant for fixing said toxic waste and hardening the obtained mixture by the addition of an inorganic hydraulic binding agent and water, wherein said fixant comprises at least a mixture of an iron salt and a manganese salt.
Dependencies are inferred from the claim text.