Patent ID: 6235082
Filing Date: 2001-05-22
Classification: C21B,Y02P

Abstract:
A method for producing liquid pig iron or liquid steel preproducts from feed streams of ore and of slagforming fluxes, comprising:directly reducing the ore to sponge metal in at least one fluidized bed reduction zone;melting the sponge metal in a melt-down gasifying zone under the supply of carbon carriers and an oxygen-containing gas;producing a CO- and H.sub.2 -containing process gas to serve as a reducing gas in the melt-down gasifying zone and feeding the reducing gas through the reduction zone in counterflow to the ore;reacting the reducing gas with the ore in the reduction zone;subsequently withdrawing the reacted reducing gas;calcining the slagforming fluxes with only the process gas in a calcining zone that is separate from the reduction zone and melt-down zone, wherein the calcining of the slagforming fluxes in the calcining zone is performed in parallel to the reducing of the ore in the reduction zone; andfeeding the calcined fluxes from the calcining zone directly into the melter gasifier and separately from the sponge metal to be melted along with the sponge metal in the melt-down gasifying zone under the supply of carbon carriers and the oxygen-containing gas.