Process for producing liquid pig iron or semifinished steel products from iron-containing materials

摘要

In a method for producing liquid pig iron (9) or steel pre-products from fine-particulate iron-containing material (4) in a melter gasifier (1), the iron-containing material (4) is melted in a bed of solid carbon carriers (2) under supply of carbon-containing material (2) and oxygen-containing gas, at the simultaneous formation of a reducing gas, wherein the fine-particulate reduced material (4) and oxygen are introduced into the bed (20, 21) from the side. To be able to charge the fine-particulate iron-containing material to the melter gasifier (1) without a need for briquetting and, in doing so, avoid discharging of the fine-particulate iron-containing material (4) by the reducing gas formed in the melter gasifier (1), a fluidized bed (21) of fine-particulate solid carbon carriers (2) and fine-particulate iron-containing reduced material (4) is maintained above a fixed bed (20) formed of solid carbon carriers (2) and the fine-particulate reduced material (4) is charged into the fluidized bed (21) directly, in immediate contact with oxygen, preferably in the form of a strand having a ring-shaped cross-section and peripherally surrounding an oxygen jet and enclosing the oxygen, such that the oxygen is enclosed by the supplied fine-particulate reduced material (4), and the fine-particulate reduced material (4) is melted in the fluidized bed (FIG. 1).