Abstract: In a plant for the production of pig iron and/or sponge iron, comprising at least one fluidized bed reactor adapted to receive fine ore, a reducing-gas feed duct leading to said fluidized bed reactor, an off gas discharge duct departing from the fluidized bed reactor and a discharge means, preferably a briquetting means, provided for the reduction product formed in the fluidized bed reactor, the off gas discharge duct of the fluidized bed reactor runs into a purification means, such as a scrubber, subsequently into a heating means and finally into the reducing gas feed duct of the fluidized bed reactor. To produce a product having a high quality standard at a minimum energy input, the heating means is constructed such that it comprises two stages including a heat exchanger as the heating means for the reducing gas and, connected serially therewith, a partial combustion means for the reducing gas with an oxygen feeding means.

Abstract: In a process for the production of molten pig iron or molten steel pre-products and sponge iron from charging materials consisting of iron ore and, if desired, fluxes, direct reduction of the charging materials to sponge iron is carried out in a fixed-bed reduction zone, the sponge iron is melted in a meltdown gasifying zone under supply of carbon carriers as well as an oxygen-containing gas and a CO- and H.sub.2 -containing reducing gas is produced which is fed to the reduction zone, is reacted there and is drawn off as an export gas, and the drawn-off export gas is subjected to CO.sub.2 elimination and for the production of sponge iron is along with part of the reducing gas formed in the meltdown gasifying zone as an at least largely CO.sub.2 free reducing gas conveyed to a further reduction zone for the direct reduction of iron ore.

Abstract: A plant for the production of pig iron and/or sponge iron includes a direct-reduction shaft furnace for lumpy iron ore, a melter gasifier, a feed duct for a reducing gas connecting the melter gasifier with the shaft furnace, a conveying duct for the reduction product formed in the shaft furnace connecting the shaft furnace with the melter gasifier, a top-gas discharge duct departing from the shaft furnace, feed ducts for oxygen-containing gases and carbon carriers running into the melter gasifier and a tap for pig iron and slag provided at the melting vessel.

Abstract: A process for producing molten pig iron or molten steel pre-products from charging substances formed of iron ores and fluxes and at least partially comprising fines, wherein the charging substances are directly reduced to sponge iron in at least one reduction zone by the fluidized layer process, the sponge iron is melted in a melting-gasifying zone under supply of carbon carriers and oxygen-containing gas, and a CO and H.sub.2 -containing reducing gas is produced, which is injected into the reduction zone, is reacted there, is withdrawn as an export gas and is supplied to a consumer, is to be improved with a view to rendering feasible the use of fine ore in an economic manner.

Abstract: A plant is provided for producing molten pig iron or molten steel pre-products from lumpy, iron-ore-containing charging substances. The plant comprises a reduction shaft furnace for receiving lumpy, iron-ore-containing charging substances, the plant including a melter gasifier for receiving the reduction product formed in the reduction shaft furnace. The plant also includes a first charging device for at least one of iron ore and ore dust and a second charging device for solid carbon carriers, the melter gasifier being provided with a device for flow-connecting the first charging device for at least one of iron ore and ore dust and the second charging device for charging carbon carriers to at least one dust burner.

Abstract: A process for producing molten pig iron or molten steel pre-products from charging substances formed of iron ores and fluxes and at least partially comprising fines, wherein the charging substances are directly reduced to sponge iron in at least one reduction zone by the fluidized layer process, the sponge iron is melted in a melting-gasifying zone under supply of carbon carriers and oxygen-containing gas, and a CO and H.sub.2 -containing reducing gas is produced, which is injected into the reduction zone, is reacted there, is withdrawn as an export gas and is supplied to a consumer, is to be improved with a view to rendering feasible the use of fine ore in an economic manner.

Abstract: A process for producing molten pig iron or molten steel pre-products from charging substances formed of iron ores and fluxes and at least partially comprising fines, wherein the charging substances are directly reduced to sponge iron in at least one reduction zone by the fluidized layer process, the sponge iron is melted in a melting-gasifying zone under supply of carbon carriers and oxygen-containing gas, and a CO and H.sub.2 -containing reducing gas is produced, which is injected into the reduction zone, is reacted there, is withdrawn as an export gas and is supplied to a consumer, is to be improved with a view to rendering feasible the use of fine ore in an economic manner.

Abstract: In a method of producing molten pig iron from lumpy, iron-ore-containing charging substances, the latter are reduced in a reduction shaft furnace by means of a reducing gas, wherein the iron sponge particles obtained are melted in a melter gasifier under supply of coal and oxygen-containing gas under simultaneous formation of the reducing gas, and the reducing gas is returned to the reduction zone of the shaft furnace.To enable charging of larger amounts of fine ore and/or ore particles, such as oxidic iron fine dust incurred in a metallurgical plant, in addition to the charging substances, the fine ore and/or the ore dust is supplied with solid carbon carriers to at least one dust burner working into the melter gasifier and is reacted in a substoichiometric cumbustion reaction.