Method and device for reducing iron-oxide-containing feedstocks in high-pressure reducing unit

• Main Authors: MILLNER ROBERT, ROSENFELLNER GERALD
• Format: Patent
• Language: Chinese; English
• Published: 15.10.2014
• Subjects: CHEMISTRY; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON

The invention relates to a method for reducing iron-oxide-containing feedstocks, in which a reducing gas is introduced into a high-pressure reducing unit (1). In the high-pressure reducing unit (1), the reducing gas is consumed by reducing iron-oxide-containing feedstocks and is withdrawn as top gas from the high-pressure reducing unit (1). At least one subportion of the top gas is admixed to a feed gas as recycle gas (15), wherein the reducing gas is generated by CO2 being separated off from the gas mixture obtained from the addition of the recycle gas (15) to the feed gas after one or more compression steps, and the recycle gas (15) is added to the feed gas in at least two recycle gas substreams that are separated from one another with recycle gas substream pressures in various distances from the high-pressure reducing unit (1).