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. 07, 2001
Filed:
Aug. 02, 1999
Iakov Gordon, North York, CA;
Michael Blank, Modi'in, IL;
Hatch Associates Ltd., Mississauga, CA;
Abstract
A method for effecting direct reduction of iron oxides in the form of lumps or pellets, in which an ore burden is passed downwardly successively through prereduction and metallization zones of a shaft furnace while passing a flow of rich fuel gas produced by external partial combustion upwardly in counter current through the prereduction zone, and passing a flow of reducing gas in cocurrent though the metallization zone. The flow of reducing gas is an independent flow that has not been subject to external combustion, and an intermediate zone is provided forming a narrowed throat between the prereduction and metallization zones. The reducing gas is introduced at a boundary between the intermediate and metallization zones, such that passage of rich fuel gas from the prereduction zone to the metallization zone is inhibited. The gas flows should be controlled so that about 5% to 10% of the volume of reducing gas passes upwardly from the intermediate zone to the prereduction zone.