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:
Feb. 13, 1990
Filed:
Mar. 01, 1988
Thomas W Hoffman, Charlotte, NC (US);
Midrex International B.V., Zurich, CH;
Abstract
An improved method and apparatus for producing metallized iron or other metal by direct reduction of particulate metal oxide is disclosed. Spent reducing gas is recycled from a reduction furnace through a cooler-scrubber and a catalyst-containing stoichiometric gas reformer. In the cooler-scrubber, the spent reducing gas interacts with scrub water. Dust having an affinity for sulfur is recovered from the process and added to the scrub water causing sulfur in the spent reducing gas to form solids which precipitate and are removed as solid waste. Lowering the sulfur content of the spent reducing gas reduces the sulfur contamination of the catalyst and improves the efficiency of the process.