Process of reducing fine-grained iron-containing material by means of solid carbonaceous reducing agents

US4806158A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Martin Hirsch · Friedrichsdorf, DE
• Fritz Rose · Bad Homburg vor der Höhe, DE
• Harry Serbent · Hanau, DE

Key dates

• Filing date: Jul 31, 1987
• Grant date: Feb 21, 1989
• Expiry date: Jul 31, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed is a process for the production of reduced iron oxide-containing materials. Iron oxide and solid carbonaceous reducing agent are charged into a first expanded fluidized bed, which is supplied with an oxygen-containing fluidizing gas. The gas residence time selected is controlled in the reactor containing the first fluidized bed so that the reduction potential will result in a reduction of the iron oxide material not in excess of the FeO stage. A gas-solids suspension discharged from the first fluidized bed is supplied to a second expanded fluidized bed, which is supplied with a strongly reducing fluidizing gas. Strongly reducing gas and a major portion of the resulting devolatilized carbonaceous material are discharged from the upper portion of the second fluidized bed. Reduced material having a metallization of 50 to 80% and the remaining devolatilized carbonaceous material are discharged from the lower portion of the second fluidized bed.