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:
Jan. 19, 1999
Filed:
Oct. 07, 1996
Keith Edward Forrester, Hampton, NH (US);
Other;
Abstract
Ash residues produced from solid waste combustion and certain industrial residues which are sometimes contacted with water for dust control, quenched for temperature reduction or subjected to water separation methods, have lead (Pb) and other heavy metals in sufficient solubility to sometimes fail the USEPA TCLP test and other acid leaching tests. Addition of a water-insoluble precipitating agent, such as pulverized phosphate rock or a precipitating agent coated with a water-insoluble film, during waste generation or collection allows the waste to pass TCLP regulatory testing, reduces Pb leaching under acid conditions and provides a water-insoluble stabilizing seed which will remain with the residue throughout water spraying, quenching or wet processing.