Patent ID: 6214083
Filing Date: 2001-04-10
Classification: C21B,Y02P

Abstract:
Method of producing liquid pig iron or liquid steel pre-products from iron-oxide-containing material, comprising the steps of:reducing fine-particulate iron-oxide-containing material to fine-particulate sponge iron by the fluidized bed method by means of a reducing gas in at least one fluidized bed reduction stage;reducing lumpy ore to lumpy sponge iron in a fixed bed reduction stage which is structurally separate from the fluidized bed reduction stage; andcharging the fine-particulate sponge-iron and the lumpy sponge iron into a melting-gasifying zone to become molten there under a supply of carbon carriers and oxygen-containing gas, wherein a CO-- and H.sub.2 -containing reducing gas is generated for reducing the iron-oxide-containing material, and wherein the fine-particulate sponge iron produced from the fine-particulate iron-oxide-containing material is charged directly to the melting-gasifying zone in an untreated condition and in fine-particulate form and, there, is melted together with the lumpy sponge iron.