Leach-resistant solid bodies from fly ash and heavy metal sludge
AssigneeAmax Resource Recovery Systems, Inc.
InventorRobert W. Styron
Life of this patent
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Abstract
Solid, leach-resistant bodies are formed from aqueous heavy metal sludge and fly ash formed in the combustion of subbituminous coal from the Power River Basin by slurrying the sludge with an amount of fly ash equivalent to between about 20 wt. % and about 70 wt. % based on the weight of the slurry, wherein the initial liquid content of the slurry is such that the slurry will harden into a body having a 7-day compressive strength of at least about 250 psi, and allowing the slurry to harden.
Claims16
A process of treating an aqueous sludge containing at least one heavy metal species selected from the group consisting of tungsten, cadmium, chromium, strontium, copper, iron, lead, nickel, zinc, molybdenum, tin, magnesium, aluminum, phosphorus, and manganese, to form a solid leach-resistant body, comprising forming a slurry consisting of said sludge, fly ash formed in the combustion of sub-bituminous coal from the Powder River Basin wherein said fly ash is present in an amount effective to form a slurry which will harden into a solid, leach-resistant body, and an initial water content such that the body will have a 7-day compressive strength of at least about 250 psi, and allowing the slurry to harden.
Dependencies are inferred from the claim text.