초록 ▼

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 rea

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.

대표청구항 ▼

A process for the direct reduction of iron oxide-containing materials, comprising: introducing an iron oxide-containing material and a solid carbonaceous reducing agent into a first expanded fluidized bed; introducing an oxygen containing gas into said first expanded fluidized bed as fluidizing gas;

A process for the direct reduction of iron oxide-containing materials, comprising: introducing an iron oxide-containing material and a solid carbonaceous reducing agent into a first expanded fluidized bed; introducing an oxygen containing gas into said first expanded fluidized bed as fluidizing gas; maintaining weakly reducing conditions in said first expanded fluidized bed and adjusting the gas residence time therein so that reduction potential will result as a reduction of the iron oxide-containing material not in excess of the FeO state; discharging a gas-solids suspension from the first expanded fluidized bed; introducing the gas-solids suspension into a second expanded fluidized bed; supplying a strongly reducing gas as fluidizing gas into said second expanded fluidized bed; discharging at least a portion of the devolatilized material with the strongly reducing gas from an upper section of the second expanded fluidized bed; and discharging the reduced material from the lower portion of the second expanded fluidized bed.