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:
Apr. 10, 2001
Filed:
Feb. 11, 1998
Horst Wiesinger, Linz, AT;
Voest-Alpine Industrieanlagenbau GmbH, Linz, AT;
Abstract
In a method of producing liquid pig iron or liquid steel pre-products from iron-oxide-containing material, fine-particulate iron-oxide-containing material is reduced to fine-particulate sponge iron by the fluidized bed method by passing a reducing gas through at least one fluidized bed reduction stage (,), and lumpy ore is reduced to lumpy sponge iron in a fixed bed reduction stage (,). The sponge iron is charged into a melting-gasifying zone (,) and is molten there under a supply of carbon carriers and oxygen-containing gas, in which a CO— and H,-containing reducing gas is generated for reducing the iron-oxide-containing material. To avoid treating the fine-particulate sponge iron separately from the lumpy sponge iron, the fine-particulate sponge is charged directly to the melting-gasifying zone (,) in an untreated condition and in fine-particulate form, and there, is melted together with the lumpy sponge iron.