Process for reducing fine-grain iron oxide materials with a gas

US5382277A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventor

• Fritz Rose · Bad Homburg vor der Höhe, DE

Key dates

• Filing date: Sep 24, 1993
• Grant date: Jan 17, 1995
• Expiry date: Sep 24, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/122
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process is described in which iron oxide-containing materials are reduced by a treatment with a gas underpressure in series-connected fluidized bed reactors, wherein hydrocarbons are cracked to produce the fresh reducing gas, reducing gas is fed to the first fluidized bed reactor as a fluidizing gas, the gaseous effluent from the first fluidized bed reactor is dedusted and is then fed as a fluidizing gas to at least one further fluidized bed reactor is dedusted and is subsequently treated in a scrubber-cooler to remove substantially all H.sub.2 O and residual dust, purified gas is recycled as recycle gas to the first fluidized bed reactor and the iron oxide-containing materials are preheated and are subsequently fed to the last fluidized bed reactor. The hydrocarbons are cracked by an approximately stoichiometric steam stoichiometric steam reforming. The freshly produced reducing gas is fed to one or more fluidized bed reactors.