Title: Process of reducing fine-grained iron-containing material by means of solid carbonaceous reducer
Application Number: 87106305 Application Date: 1987.07.30
Publication Number: 1017368 Publication Date: 1988.03.30
Approval Pub. Date: 1992.03.18 Granted Pub. Date: 1992.03.18
International Classifi-cation: C21B13/00
Applicant(s) Name: Metallgesellschaft AG Address:
Inventor(s) Name: Fritz Rose;Harry Serbent;Martin Hirsch
Attorney & Agent: QUAN JING
Abstract:
    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 short 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. A major portion of the resulting devolatilized carbonaceous material are separated from the gas and circulated to the first fluidized bed. A portion of the gas discharged from the second fluidized bed is purified and removed CO2, then circulated to the second fluidized bed as fluidized gas. 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.
Time: 5