Stabilization of lead bearing waste
OwnerKeith E. Forresterinventor
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Abstract
A method is disclosed for reducing the leaching of lead from a lead bearing material or waste. The method includes contacting the material or waste with a water soluble phosphate and a complexing agent, wherein the complexing agent is at least slightly water soluble, whereby a lead product is formed which is less soluble than the lead originally in the material or waste, thereby reducing the leaching of lead from the material or waste as determined by a leach test performed on the material or waste.
Claims24
A method for reducing the leaching of lead from a lead bearing material or waste, comprising contacting said material or waste with a water soluble phosphate and acid selected from the group consisting of sulfuric acid, nitric acid and combinations thereof, in the presence of a complexing agent containing Fe(II), Fe(III), Al(III), chloride or combination thereof, wherein the complexing agent is at least slightly water soluble, whereby a lead product is formed which is less soluble than the lead originally in said material or waste, thereby reducing the leaching of lead from said material or waste as determined by a leach test performed on said material or waste.
A method for reducing the leaching of lead from a lead bearing material or waste, comprising contacting said material or waste with a composition comprising a water soluble phosphate and acid selected from the group consisting of sulfuric acid, nitric acid and combinations thereof, in the presence of aluminum and/or iron multivalent cationic component, whereby a lead product is formed which is less soluble than the lead originally in said material or waste, thereby reducing the leaching of lead from said material or waste as determined by a leach test performed on said material or waste.
A method for reducing the leaching of lead from lead bearing incinerator ash, comprising contacting said incinerator ash with a water soluble phosphate and acid selected from the group consisting of sulfuric acid, nitric acid and combinations thereof, in the presence of a complexing agent containing Fe(II), Fe(III), Al(III), chloride or combination thereof, wherein the completing agent is at least slightly water soluble, whereby a lead product is formed which is less soluble than the lead originally in said incinerator ash, thereby reducing the leaching of lead from said incinerator ash as determined by a leach test performed on said incinerator ash.
Dependencies are inferred from the claim text.