Method and integrated plant for the production of steel by means of direct reduction or iron oxides

摘要

Method and integrated plant for the production of steel starting from mineral iron, wherein the iron is present in the form of oxides, comprising the following steps and means for doing so: the mineral iron is fed into a vertical reduction furnace (10) of the type with a gravitational load; a mixture of high temperature gas is injected into the reduction furnace (10); the directly reduced iron (DRI) is removed from the reduction furnace (10), and the directly reduced iron (DRI) is melted in a melting furnace (51); the directly reduced iron (DRI) going to feed the melting furnace (51) directly and at least a part of the recircled gases of the reduction furnace (10) being used in a scrap pre-heating station (60) or as fuel for burners (62, 66) or directly introduced into the scrap pre-heating station (60).