Abstract: A device for closed-loop control of process gases (11) in a plant (8) for producing directly reduced metal ores includes at least one reduction unit (10), an appliance upstream of the reduction unit (10) for separating gas mixtures (18), a gas purification appliance (13) connected downstream of the reduction unit (10) for rate control of process gases (11). Process gases (11) are obtained by recycling from the production process itself and from a plant for pig iron generation (1) via a supply conduit (16). An open-loop pressure control appliance (15) upstream of a junction of the supply conduit (16) into a return conduit (14) for the process gases (11) such that a pressure level for the appliance for separating gas mixtures (18) is kept constant and the process gases (9,11) are controlled in a closed-loop manner in a plant for producing directly reduced metal ores (8).

Abstract: A metallurgical plant has a plant positioned upstream of a steel-generating plant and has a gas-generating plant which generates an export gas. Carbon dioxide and/or water contained in the export gas is removed from the export gas in a separation device. A resulting product gas is heated, before being supplied to the upstream plant, in a firing unit through the combustion of a heating gas. Excess thermal energy produced during the combustion of the heating gas which is not used for heating the product gas is thermally utilized. The utilization may take place within the firing unit through steam generation and/or downstream of the firing unit to preheat the heating gas and/or an oxidation gas used for the combustion of the heating gas and/or through the pre-heating and/or drying of raw materials to be supplied to the upstream plant and/or to the gas-generating plant.

Abstract: In a method and an apparatus for separating at least one gaseous component from a waste gas of an installation for producing liquid pig iron, liquid primary steel products or sponge iron, in a first step, a stream of the waste gas passes through at least one adsorption separator at a first pressure, whereby the gaseous component is largely separated from the waste gas and, in a second step, the gaseous component is largely removed from the adsorption separator at a second pressure, which is lower than the first pressure. The method and apparatus are maintenance-free, cause low investment and energy costs and has a lower space requirement by a method in which the second pressure or the desorption pressure is generated by at least one jet pump, which is fed a stream of a propellant gas at a third pressure, which is higher than the second pressure.

Abstract: In a method and an apparatus for separating at least one gaseous component from a waste gas of an installation for producing liquid pig iron, liquid primary steel products or sponge iron, in a first step, a stream of the waste gas passes through at least one adsorption separator at a first pressure, whereby the gaseous component is largely separated from the waste gas and, in a second step, the gaseous component is largely removed from the adsorption separator at a second pressure, which is lower than the first pressure. The method and apparatus are maintenance-free, cause low investment and energy costs and has a lower space requirement by a method in which the second pressure or the desorption pressure is generated by at least one jet pump, which is fed a stream of a propellant gas at a third pressure, which is higher than the second pressure.

Abstract: A process to optimize the reduction process with a given quality of ore. The reduction gas 7 is analyzed by means of gas sensor 1 and is separated into two partial flows. The throughput of the partial flow which is oxidized is regulated by a regulation valve 3 and is then sent to the burner 4 where it is oxidized. The other partial flow of the reduction gas [7] is regulated by a regulation valve 2 according to the required amount of gas in the shaft and is thereafter brought to the required temperature in the heat exchanger 11 and mixed with the oxidized partial flow of the reduction gas. The gas components are determined by a gas sensor 13 and, when necessary, a gas delivery 14 is adjusted according to mathematical formulations. This makes it possible it possible to run the reduction process in the direction of its stoichiomeric optimum using a given quality of ore.

Abstract: They purpose of the invention is to create a process which optimizes the reduction process with a given quality of ore.

Abstract: Arrangement for the reduction of metal-oxide-bearing material, particularly of iron ore, with a reduction vessel in which the metal-oxide-bearing material is reduced in counterflow with reduction gas and which is provided with an inlet for metal-oxide-bearing material, an inlet for reduction gas, an outlet for off-gas and an outlet for reduced material, a vessel for metal-oxide-bearing material, which is connected with the reduction vessel by means of a line and a first supply line for a sealing gas which serves to seal the reduction vessel against the vessel, which first supply line is provided at the connecting line between the vessel and the reduction vessel, characterized in that at least one additional supply line for a sealing gas is provided at the connecting line, which additional supply line is located between the first supply line and the vessel.

Abstract: A process to optimize the reduction process with a given quality of ore. The reduction gas 7 is analyzed by means of gas sensor 1 and is separated into two partial flows. The throughput of the partial flow which is oxidized is regulated by a regulation valve 3 and is then sent to the burner 4 where it is oxidized. The other partial flow of the reduction gas is regulated by a regulation valve 2 according to the required amount of gas in the shaft and is thereafter brought to the required temperature in the heat exchanger 11 and mixed with the oxidized partial flow of the reduction gas. The gas components are determined by a gas sensor 13 and, when necessary, a gas delivery 14 is adjusted according to mathematical formulations. This makes it possible to run the reduction process in the direction of its stoichiomeric optimum using a given quality of ore.

Abstract: The invention relates to a reduction vessel (1) for the reduction of metal-oxide-bearing material, particularly of iron ore, by means of a reduction gas flowing countercurrently to the metal-oxide-bearing material, which reduction vessel (1) is provided with an inlet (5) for the metal-oxide-bearing material, an inlet (6) for the reduction gas, an outlet (7) for off-gas and an outlet (8) for reduced material, downstream of which outlet (8) a lower sealing leg (9) is connected, a supply line (10) for a first sealing gas being provided at the lower sealing leg (9) in order to seal the reduction vessel (1) against the environment, characterized in that at least one additional supply line (12) for an additional sealing gas is provided at the lower sealing leg (9), the additional supply line (12) being located downstream of the supply line (10) for the first sealing gas, seen in the direction of flow of the reduced material (FIG. 1).

Abstract: A plant for producing sponge metal, in particular sponge iron, from charging materials consisting of metal ore or iron ore respectively, preferably in lumps and/or pellets, and optionally fluxes, comprising at least one first gas source (1, 3) dispensing a CO— and H2- containing feedgas, a CO2 elimination plant (17, 17′) and optionally a heating means (22, 25) for the feedgas from the first gas source (1, 3) is provided with a reduction reaction (20) which forms a further gas source for a CO— and H2-containing feedgas and serves for receiving metal ore, a reducing-gas feed duct (19) leading to this reduction reactor (20) and an export-gas discharge duct (31) from said further reduction reactor (20), wherein a conveying duct (30) for at least a portion of the export gas formed in the reduction reactor (20) and serving as a feedgas is flow-connected with the reducing-gas feed duct (19) of the reduction reactor (20) via a CO2 elimination plant and optionally a heating means.

Abstract: In a method for producing liquid pig iron or liquid steel pre-products from charging substances comprising iron ore, preferably in lumps or pellets, and optionally fluxes. The charging substances are directly reduced to sponge iron in a reduction zone (12) and the sponge iron is melted in a melt-down gasifying zone (8) under the supply of carbon carriers and oxygen-containing gas. CO-and H2-containing gas is introduced into the reduction zone (12) and is reacted there. An export gas is withdrawn and conducted to a consumer (20). The export gas is subjected to CO2 removal or partial combustion and the resulting gas with CO2 is introduced back into the reduction process. This is done to keep down the carbon carriers having high portion of Cfix as well as consumption of O2.

Abstract: A process and apparatus for producing iron briquettes and/or cold iron sponge, in which charge materials (3) which contain lumpy material containing iron oxide are introduced into the reduction zone (2) of a reduction reactor (1), then a hot reduction gas introduced in a feed zone below the reduction zone flows through the charge materials, which are reduced to hot iron sponge which passes through a gas feed zone (8), which is downstream of the reduction zone (2). Reduction gas is introduced into the reduction reactor (1). After the gas has flowed through the reduction zone (2), it is extracted from the reduction reactor (1) as a top gas. To produce cold iron sponge, hot iron sponge is cooled by cooling gas in a cooling zone (10) downstream of the gas feed zone (8) and the sponge is discharged from the reactor (1) through a product-discharge zone (11) downstream of the cooling zone (10).

Abstract: Arrangement for the reduction of metal-oxide-bearing material, particularly of, iron ore, with a reduction vessel in which the metal-oxide-bearing material is reduced in counterflow with reduction gas and which is provided with an inlet for metal-oxide-bearing material, an inlet for reduction gas, an outlet for off-gas and an outlet for reduced material, a vessel for metal-oxide-bearing material, which is connected with the reduction vessel by means of a line and a first supply line for a sealing gas which serves to seal the reduction vessel against the vessel, which first supply line is provided at the connecting line between the vessel and the reduction vessel, characterized in that at least one additional supply line for a sealing gas is provided at the connecting line, which additional supply line is located between the first supply line and the vessel.

Abstract: The invention relates to a process for the reduction of metal-oxide-bearing material, particularly of iron ore, in a reduction vessel (1), wherein the metal-oxide-bearing material is charged from a vessel (2) for the metal-oxide-bearing material into the reduction vessel (1) and reduced therein by means of a reduction gas flowing counter currently to the metal-oxide-bearing material and wherein waste reduction gas discharged from the reduction vessel (1) is used for preheating the metal-oxide-bearing material in the vessel (2) for metal-oxide-bearing material, which is characterized in that the waste reduction gas discharged from the reduction vessel (1) is combusted and that a gas seal (16) is operated with the combusted waste reduction gas, which is located between the reduction vessel (1) and the vessel (2) for metal-oxide-bearing material, whereby the reduction vessel (1) is sealed against the vessel (2) for metal-oxide-bearing material (FIG. 1).

Abstract: The invention relates to a reduction vessel (1) for the reduction of metal-oxide-bearing material, particularly of iron ore, by means of a reduction gas flowing countercurrently to the metal-oxide-bearing material, which reduction vessel (1) is provided with an inlet (5) for the metal-oxide-bearing material, an inlet (6) for the reduction gas, an outlet (7) for off-gas and an outlet (8) for reduced material, downstream of which outlet (8) a lower sealing leg (9) is connected, a supply line (10) for a first sealing gas being provided at the lower sealing leg (9) in order to seal the reduction vessel (1) against the environment, characterized in that at least one additional supply line (12) for an additional sealing gas is provided at the lower sealing leg (9) , the additional supply line (12) being located downstream of the supply line (10) for the first sealing gas, seen in the direction of flow of the reduced material (FIG. 1).

Abstract: In a method for producing liquid pig iron (16) and a sponge metal from charging substances comprising iron ore (4) respectively metal ore, the charging substances are directly reduced to sponge iron in at least one first reduction zone (2) the sponge iron is melted in a melt-down gasifying zone (15) under the supply of carbon carriers (10) and oxygen-containing gas and a CO— and H2-containing reducing gas is produced which is fed to the first reduction zone (2), is reacted there and withdrawn as a top gas, wherein the withdrawn top gas after a scrubbing operation is subjected to CO2 elimination and optionally to heating and is supplied to at least one further reduction zone (27) for the direct reduction of metal ore, in particular of iron ore (26), as a reducing gas that is at least largely free from CO2 and after reaction with the metal ore (26) is withdrawn as an export gas and purified in a scrubber.

Abstract: In a process for producing sponge iron from particulate iron oxide-containing material, the iron oxide-containing material in a reduction zone is reduced to sponge iron by means of reducing gas and the gas forming during reduction is withdrawn as top gas. In order to provide for an efficient way of utilization of the top gas, the top gas is subjected to CO.sub.2 purification, CO.sub.2 -containing offgas separated in the purification is mixed with an oxygen-containing gas and is burnt, and the resulting thermal energy is supplied to a consumer.

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 process for producing liquid pig iron or liquid steel preproducts and sponge iron from iron ore. The iron ore in a first reduction zone (4) is directly reduced to sponge iron. The sponge iron in a meltdown gasifying zone (10) is melted under the supply of carbon carriers and an oxygen-containing gas, and a reducing gas containing CO and H.sub.2 is produced. The reducing gas is introduced into the first reduction zone (4), is reacted there, and is drawn off as an export gas. The drawn-off export gas is subjected to CO.sub.2 elimination as well as heating, and as a reducing gas, at least largely free of CO.sub.2, is fed to at least one further reduction zone (29) for the direct reduction of iron ore. In order to enable the export gas drawn off the further reduction zone (29) to be utilized as completely as possible, heat of the export gas leaving the further reduction zone (29) is used for heating the export gas derived from the first reduction zone (4).