Safe ceramic encapsulation of hazardous waste with specific shale material
OwnerGeneral D. Croweinventor
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Abstract
A safely encapsulated hazardous waste product free of unwanted leaching of contaminated metal constitutents and process therefor wherein a quantity of hazardous waste and a quantity of shale material characterized by having an aluminosilicate content containing at least 9.35% by weight of Fe.sub.2 O.sub.3, wherein the shale is reduced to a fine mesh before mixing, and defines a brick-like form as fired at about 1,150.degree. C. for a period of time to change the shale material into a semi-molten state and thereafter cooled to safely encapsulate the waste within the shale as a unit-handled product. The product of the invention satisfies and exceeds RCRA and LDR (EPA) requirements as shown by Toxicity Characteristic Leaching Procedure (TCLP) results.
Claims10
A safely encapsulated hazardous waste product free of unwanted leaching of metal consitutents comprising,
- a quantity of hazardous waste,
- a quantity of shale material, said shale material being characterized by the inclusion of an aluminosilicate containing at least 9.35% by weight of Fe.sub.2 O.sub.3,
- said shale material having been reduced to a fine mesh and mixed with said waste, said mixture defining a brick-like form and having been fired at about 1,150.degree. C. for a period of time to change the shale material into a semi-molten state and thereafter cooled,
- thereby safely encapsulating said waste within the shale material as a unit-handled product.
A process for safely encapsulating hazardous waste products to prevent toxic metal leaching therefrom comprising the steps of:
- providing a quantity of hazardous waste,
- providing a quantity of shale material having an aluminosilicate containing at least 9.35% by weight of Fe.sub.2 O.sub.3,
- mixing said waste with water to form a sludge,
- mixing said sludge with said shale material,
- reducing the mixture to a fine mesh,
- casting the mixture into a form,
- firing the mixture at high temperature to produce a brick-like product,
- cooling the product,
- thereby to produce an encapsulated waste product from which metals do not leach to an undesired extent.
Dependencies are inferred from the claim text.