The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1993
Filed:
Sep. 08, 1992
Paul R Graves, Jr, Phenix City, AL (US);
GNB Incorporated, Mendota Heights, MN (US);
Abstract
There is provided a method for the ecologically safe disposal of lead-contaminated hazardous industrial wastes (such, as for example, those generated as discardable by-products in primary and secondary lead smelting operations, especially, blast furnace slags and matte), which comprises reducing the size of the lead-contaminated industrial wastes and treating them, prior to encapsulation in a hardenable material, with the naturally occurring zeolite, clinoptilolite, in an amount sufficient to prevent lead ions (Pb.sup.+2) from leaching out of the industrial wastes, through exposure to the action of atmospheric agents (e.g., hot air and rain, or as a result of cyclical freezing and thawing in temperature climates), even over an extended period of time.