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:
Sep. 19, 2000
Filed:
Mar. 25, 1998
Peter J Koros, Pittsburgh, PA (US);
Jagjit S Bajaj, Murrysville, PA (US);
Valdis R Daiga, Toledo, OH (US);
Vishwaprakash S Hegde, Strongsville, OH (US);
LTV Steel Company, Inc., Cleveland, OH (US);
Maumee Research and Engineering, Inc., Perrysburg, OH (US);
USX Corporation, Pittsburgh, PA (US);
Abstract
A process of recovering iron values and separating zinc oxides and other contaminants from steel mill waste metal oxides, such as blast furnace dust, BOF dust, mill scale and oily sludges, characterized by iron metallization levels up to 95% or more and zinc oxide removal in excess of 99%, and including the steps of blending the oxides with coke breeze in an amount sufficient to provide a total carbon content of 16% to 22%, the coke breeze having a particle size of 50% or more plus 60 mesh or larger, briquetting the blend to form briquettes having a thickness ranging from 1/2' to 3/4', and firing the briquettes in a rotary hearth furnace to metallize the iron and evolve zinc and other oxide contaminants.