Patent ID: 9255302
Filing Date: 2016-02-09
CPC Classification: C21B,Y02P

Claim Text:
1. A method for reduction of raw materials containing iron oxide, comprising: introducing a reduction gas into a pressure reduction unit; consuming the reduction gas by reduction of raw materials containing iron oxide in the pressure reduction unit and drawing off top gas; forming a gas mixture with a feed gas and at least a part quantity of top gas as a recycle gas; creating the reduction gas by mixing the recycle gas with the feed gas after one or more compression steps to form the gas mixture and separating CO wherein forming the gas mixture occurs in at least two recycle gas part flows separate from one another at different distances from the pressure reduction unit by compressing the gas mixture and then mixing in a further recycle gas part flow; and regulating a quantity of the gas mixture such that a pressure of one of a recycle gas part flow is greater than a pressure of other respective recycle gas part flows.